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setup.cpp
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#include "setup.hpp"
#ifdef BENCHMARK
#include "info.hpp"
void main_setup() { // benchmark; required extensions in defines.hpp: BENCHMARK, optionally FP16S or FP16C
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
uint mlups = 0u; {
//LBM lbm( 32u, 32u, 32u, 1.0f);
//LBM lbm( 64u, 64u, 64u, 1.0f);
//LBM lbm(128u, 128u, 128u, 1.0f);
LBM lbm(256u, 256u, 256u, 1.0f); // default
//LBM lbm(384u, 384u, 384u, 1.0f);
//LBM lbm(512u, 512u, 512u, 1.0f);
//const uint memory = 1488u; // memory occupation in MB (for multi-GPU benchmarks: make this close to as large as the GPU's VRAM capacity)
//const uint3 lbm_N = resolution(float3(1.0f, 1.0f, 1.0f), memory); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
//LBM lbm(1u*lbm_N.x, 1u*lbm_N.y, 1u*lbm_N.z, 1u, 1u, 1u, 1.0f); // 1 GPU
//LBM lbm(2u*lbm_N.x, 1u*lbm_N.y, 1u*lbm_N.z, 2u, 1u, 1u, 1.0f); // 2 GPUs
//LBM lbm(2u*lbm_N.x, 2u*lbm_N.y, 1u*lbm_N.z, 2u, 2u, 1u, 1.0f); // 4 GPUs
//LBM lbm(2u*lbm_N.x, 2u*lbm_N.y, 2u*lbm_N.z, 2u, 2u, 2u, 1.0f); // 8 GPUs
// #########################################################################################################################################################################################
for(uint i=0u; i<1000u; i++) {
lbm.run(10u);
mlups = max(mlups, to_uint((double)lbm.get_N()*1E-6/info.dt_smooth));
}
} // make lbm object go out of scope to free its memory
print_info("Peak MLUPs/s = "+to_string(mlups));
#if defined(_WIN32)
wait();
#endif // Windows
} /**/
#endif // BENCHMARK
/*void main_setup() { // 3D Taylor-Green vortices; required extensions in defines.hpp: INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
LBM lbm(128u, 128u, 128u, 1u, 1u, 1u, 0.01f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
const float A = 0.25f;
const uint periodicity = 1u;
const float a=(float)Nx/(float)periodicity, b=(float)Ny/(float)periodicity, c=(float)Nz/(float)periodicity;
const float fx = (float)x+0.5f-0.5f*(float)Nx;
const float fy = (float)y+0.5f-0.5f*(float)Ny;
const float fz = (float)z+0.5f-0.5f*(float)Nz;
lbm.u.x[n] = A*cos(2.0f*pif*fx/a)*sin(2.0f*pif*fy/b)*sin(2.0f*pif*fz/c);
lbm.u.y[n] = -A*sin(2.0f*pif*fx/a)*cos(2.0f*pif*fy/b)*sin(2.0f*pif*fz/c);
lbm.u.z[n] = A*sin(2.0f*pif*fx/a)*sin(2.0f*pif*fy/b)*cos(2.0f*pif*fz/c);
lbm.rho[n] = 1.0f-sq(A)*3.0f/4.0f*(cos(4.0f*pif*fx/a)+cos(4.0f*pif*fy/b));
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_STREAMLINES;
lbm.run();
//lbm.run(1000u); lbm.u.read_from_device(); println(lbm.u.x[lbm.index(Nx/2u, Ny/2u, Nz/2u)]); wait(); // test for binary identity
} /**/
/*void main_setup() { // 2D Taylor-Green vortices (use D2Q9); required extensions in defines.hpp: INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
LBM lbm(1024u, 1024u, 1u, 0.02f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
const float A = 0.2f;
const uint periodicity = 5u;
const float a=(float)Nx/(float)periodicity, b=(float)Ny/(float)periodicity;
const float fx = (float)x+0.5f-0.5f*(float)Nx;
const float fy = (float)y+0.5f-0.5f*(float)Ny;
lbm.u.x[n] = A*cos(2.0f*pif*fx/a)*sin(2.0f*pif*fy/b);
lbm.u.y[n] = -A*sin(2.0f*pif*fx/a)*cos(2.0f*pif*fy/b);
lbm.rho[n] = 1.0f-sq(A)*3.0f/4.0f*(cos(4.0f*pif*fx/a)+cos(4.0f*pif*fy/b));
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_STREAMLINES;
lbm.run();
} /**/
/*void main_setup() { // Poiseuille flow validation; required extensions in defines.hpp: VOLUME_FORCE
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint R = 63u; // channel radius (default: 63)
const float umax = 0.1f; // maximum velocity in channel center (must be < 0.57735027f)
const float tau = 1.0f; // relaxation time (must be > 0.5f), tau = nu*3+0.5
const float nu = units.nu_from_tau(tau); // nu = (tau-0.5)/3
const uint H = 2u*(R+1u);
#ifndef D2Q9
LBM lbm(H, lcm(sq(H), WORKGROUP_SIZE)/sq(H), H, nu, 0.0f, units.f_from_u_Poiseuille_3D(umax, 1.0f, nu, R), 0.0f); // 3D
#else // D2Q9
LBM lbm(lcm(H, WORKGROUP_SIZE)/H, H, 1u, nu, units.f_from_u_Poiseuille_2D(umax, 1.0f, nu, R), 0.0f, 0.0f); // 2D
#endif // D2Q9
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
#ifndef D2Q9
if(!cylinder(x, y, z, lbm.center(), float3(0u, Ny, 0u), 0.5f*(float)min(Nx, Nz)-1.0f)) lbm.flags[n] = TYPE_S; // 3D
#else // D2Q9
if(y==0u||y==Ny-1u) lbm.flags[n] = TYPE_S; // 2D
#endif // D2Q9
} // ######################################################################### run simulation, export images and data ##########################################################################
double error_min = max_double;
while(true) { // main simulation loop
lbm.run(1000);
lbm.u.read_from_device();
string s;
double error_dif=0.0, error_sum=0.0;
#ifndef D2Q9
for(uint x=0u; x<Nx; x++) {
for(uint y=Ny/2u; y<Ny/2u+1u; y++) {
for(uint z=0; z<Nz; z++) {
const uint n = x+(y+z*Ny)*Nx;
const double r = (double)sqrt(sq(x+0.5f-0.5f*(float)Nx)+sq(z+0.5f-0.5f*(float)Nz)); // radius from channel center
if(r<R) {
const double unum = (double)sqrt(sq(lbm.u.x[n])+sq(lbm.u.y[n])+sq(lbm.u.z[n])); // numerical velocity
const double uref = umax*(sq(R)-sq(r))/sq(R); // theoretical velocity profile u = G*(R^2-r^2)
error_dif += sq(unum-uref); // L2 error (Krüger p. 138)
error_sum += sq(uref);
s += to_string(r)+" "+to_string(unum)+" "+to_string(uref)+"\n";
}
}
}
}
#else // D2Q9
for(uint x=Nx/2u; x<Nx/2u+1u; x++) {
for(uint y=1u; y<Ny-1u; y++) {
const uint n = x+(y+0u*Ny)*Nx;
const double r = (double)(y+0.5f-0.5f*(float)Ny); // radius from channel center
const double unum = (double)sqrt(sq(lbm.u.x[n])+sq(lbm.u.y[n])); // numerical velocity
const double uref = umax*(sq(R)-sq(r))/sq(R); // theoretical velocity profile u = G*(R^2-r^2)
error_dif += sq(unum-uref); // L2 error (Krüger p. 138)
error_sum += sq(uref);
s += to_string(r)+" "+to_string(unum)+" "+to_string(uref)+"\n";
}
}
#endif // D2Q9
if(sqrt(error_dif/error_sum)>=error_min) { // stop when error has converged
print_info("Poiseuille flow error converged after "+to_string(lbm.get_t())+" steps to "+to_string(100.0*error_min, 3u)+"%"); // typical expected L2 errors: 2-5% (Krüger p. 256)
wait();
exit(0);
}
error_min = fmin(error_min, sqrt(error_dif/error_sum));
print_info("Poiseuille flow error after t="+to_string(lbm.get_t())+" is "+to_string(100.0*error_min, 3u)+"%"); // typical expected L2 errors: 2-5% (Krüger p. 256)
}
} /**/
/*void main_setup() { // Stokes drag validation; required extensions in defines.hpp: FORCE_FIELD, EQUILIBRIUM_BOUNDARIES
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint T = 100u; // check error every T steps
const float R = 32.0f; // sphere radius
const float Re = 0.01f; // Reynolds number
const float nu = 1.0f; // kinematic shear viscosity
const float rho = 1.0f; // density
const uint L = to_uint(8.0f*R); // simulation box size
const float u = units.u_from_Re(Re, 2.0f*R, nu); // velocity
LBM lbm(L, L, L, nu); // flow driven by equilibrium boundaries
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E;
if(sphere(x, y, z, lbm.center(), R)) {
lbm.flags[n] = TYPE_S|TYPE_X; // flag boundary nodes for force summation additionally with TYPE_X
} else {
lbm.rho[n] = units.rho_Stokes(lbm.position(x, y, z), float3(-u, 0.0f, 0.0f), R, rho, nu);
const float3 un = units.u_Stokes(lbm.position(x, y, z), float3(-u, 0.0f, 0.0f), R);
lbm.u.x[n] = un.x;
lbm.u.y[n] = un.y;
lbm.u.z[n] = un.z;
}
} // ######################################################################### run simulation, export images and data ##########################################################################
double E1=1000.0, E2=1000.0;
while(true) { // main simulation loop
lbm.run(T);
lbm.calculate_force_on_boundaries();
lbm.F.read_from_device();
const float3 force = lbm.calculate_force_on_object(TYPE_S|TYPE_X);
const double F_theo = units.F_Stokes(rho, u, nu, R);
const double F_sim = (double)length(force);
const double E0 = fabs(F_sim-F_theo)/F_theo;
print_info(to_string(lbm.get_t())+", expected: "+to_string(F_theo, 6u)+", measured: "+to_string(F_sim, 6u)+", error = "+to_string((float)(100.0*E0), 1u)+"%");
if(converged(E2, E1, E0, 1E-4)) { // stop when error has sufficiently converged
print_info("Error converged after "+to_string(lbm.get_t())+" steps to "+to_string(100.0*E0, 1u)+"%");
wait();
break;
}
E2 = E1;
E1 = E0;
}
} /**/
/*void main_setup() { // cylinder in rectangular duct; required extensions in defines.hpp: VOLUME_FORCE, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const float Re = 25000.0f;
const float D = 64.0f;
const float u = rsqrt(3.0f);
const float w=D, l=12.0f*D, h=3.0f*D;
const float nu = units.nu_from_Re(Re, D, u);
const float f = units.f_from_u_rectangular_duct(w, D, 1.0f, nu, u);
LBM lbm(to_uint(w), to_uint(l), to_uint(h), nu, 0.0f, f, 0.0f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
lbm.u.y[n] = 0.1f*u;
if(cylinder(x, y, z, float3(lbm.center().x, 2.0f*D, lbm.center().z), float3(Nx, 0u, 0u), 0.5f*D)) lbm.flags[n] = TYPE_S;
if(x==0u||x==Nx-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // x and z non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_Q_CRITERION;
lbm.run();
} /**/
/*void main_setup() { // Taylor-Couette flow; required extensions in defines.hpp: MOVING_BOUNDARIES, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
LBM lbm(96u, 96u, 192u, 1u, 1u, 1u, 0.04f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(!cylinder(x, y, z, lbm.center(), float3(0u, 0u, Nz), (float)(Nx/2u-1u))) lbm.flags[n] = TYPE_S;
if( cylinder(x, y, z, lbm.center(), float3(0u, 0u, Nz), (float)(Nx/4u ))) {
const float3 relative_position = lbm.relative_position(n);
lbm.u.x[n] = relative_position.y;
lbm.u.y[n] = -relative_position.x;
lbm.u.z[n] = (1.0f-random(2.0f))*0.001f;
lbm.flags[n] = TYPE_S;
}
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_STREAMLINES;
lbm.run();
//lbm.run(4000u); lbm.u.read_from_device(); println(lbm.u.x[lbm.index(Nx/4u, Ny/4u, Nz/2u)]); wait(); // test for binary identity
} /**/
/*void main_setup() { // lid-driven cavity; required extensions in defines.hpp: MOVING_BOUNDARIES, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint L = 128u;
const float Re = 1000.0f;
const float u = 0.1f;
LBM lbm(L, L, L, units.nu_from_Re(Re, (float)(L-2u), u));
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(z==Nz-1) lbm.u.y[n] = u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_STREAMLINES;
lbm.run();
} /**/
/*void main_setup() { // particle test; required extensions in defines.hpp: VOLUME_FORCE, FORCE_FIELD, MOVING_BOUNDARIES, PARTICLES, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint L = 128u;
const float Re = 1000.0f;
const float u = 0.1f;
LBM lbm(L, L, L, units.nu_from_Re(Re, (float)(L-2u), u), 0.0f, 0.0f, -0.00001f, cb(L/4u), 2.0f);
// ###################################################################################### define geometry ######################################################################################
for(ulong n=0ull; n<lbm.particles->length(); n++) {
lbm.particles->x[n] = random_symmetric(0.5f*lbm.size().x/4.0f);
lbm.particles->y[n] = random_symmetric(0.5f*lbm.size().y/4.0f);
lbm.particles->z[n] = random_symmetric(0.5f*lbm.size().z/4.0f);
}
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(z==Nz-1) lbm.u.y[n] = u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_STREAMLINES|VIS_PARTICLES;
lbm.run();
} /**/
/*void main_setup() { // delta wing; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint L = 128u;
const float Re = 100000.0f;
const float u = 0.1f;
LBM lbm(L, 4u*L, L, units.nu_from_Re(Re, (float)L, u));
// ###################################################################################### define geometry ######################################################################################
const float3 offset = float3(lbm.center().x, 0.0f, lbm.center().z);
const float3 p0 = offset+float3( 0*(int)L/64, 5*(int)L/64, 20*(int)L/64);
const float3 p1 = offset+float3(-20*(int)L/64, 90*(int)L/64, -10*(int)L/64);
const float3 p2 = offset+float3(+20*(int)L/64, 90*(int)L/64, -10*(int)L/64);
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(triangle(x, y, z, p0, p1, p2)) lbm.flags[n] = TYPE_S;
else lbm.u.y[n] = u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run();
} /**/
/*void main_setup() { // NASA Common Research Model; required extensions in defines.hpp: FP16C, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 1.5f, 1.0f/3.0f), 2000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float Re = 10000000.0f;
const float u = 0.1f;
LBM lbm(lbm_N, units.nu_from_Re(Re, (float)lbm_N.x, u));
// ###################################################################################### define geometry ######################################################################################
// model: https://commonresearchmodel.larc.nasa.gov/high-lift-crm/high-lift-crm-geometry/assembled-geometry/, .stp file converted to .stl with https://imagetostl.com/convert/file/stp/to/stl
Mesh* half = read_stl(get_exe_path()+"../stl/crm-hl_reference_ldg.stl", lbm.size(), float3(0.0f), float3x3(float3(0, 0, 1), radians(90.0f)), 1.0f*lbm_N.x);
half->translate(float3(-0.5f*(half->pmax.x-half->pmin.x), 0.0f, 0.0f));
Mesh* mesh = new Mesh(2u*half->triangle_number, float3(0.0f));
for(uint i=0u; i<half->triangle_number; i++) {
mesh->p0[i] = half->p0[i];
mesh->p1[i] = half->p1[i];
mesh->p2[i] = half->p2[i];
}
half->rotate(float3x3(float3(1, 0, 0), radians(180.0f))); // mirror-copy half
for(uint i=0u; i<half->triangle_number; i++) {
mesh->p0[half->triangle_number+i] = -half->p0[i];
mesh->p1[half->triangle_number+i] = -half->p1[i];
mesh->p2[half->triangle_number+i] = -half->p2[i];
}
delete half;
mesh->find_bounds();
mesh->rotate(float3x3(float3(1, 0, 0), radians(-10.0f)));
mesh->translate(float3(0.0f, 0.0f, -0.5f*(mesh->pmin.z+mesh->pmax.z)));
mesh->translate(float3(0.0f, -0.5f*lbm.size().y+mesh->pmax.y+0.5f*(lbm.size().x-(mesh->pmax.x-mesh->pmin.x)), 0.0f));
mesh->translate(lbm.center());
lbm.voxelize_mesh_on_device(mesh);
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run();
} /**/
/*void main_setup() { // Concorde; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 3.0f, 0.5f), 1320u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 1000000.0f;
const float lbm_u = 0.1f;
LBM lbm(lbm_N, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float size = 1.75f*lbm.size().x;
const float3 center = float3(lbm.center().x, 0.52f*size, lbm.center().z+0.03f*size);
const float3x3 rotation = float3x3(float3(1, 0, 0), radians(-10.0f))*float3x3(float3(0, 0, 1), radians(90.0f))*float3x3(float3(1, 0, 0), radians(90.0f));
lbm.voxelize_stl(get_exe_path()+"../stl/concord_cut_large.stl", center, rotation, size); // https://www.thingiverse.com/thing:1176931/files
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run();
} /**/
/*void main_setup() { // Boeing 747; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 2.0f, 0.5f), 880u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 1000000.0f;
const float lbm_u = 0.1f;
const uint lbm_T = 10000u;
LBM lbm(lbm_N, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float size = 1.0f*lbm.size().x;
const float3 center = float3(lbm.center().x, 0.55f*size, lbm.center().z);
const float3x3 rotation = float3x3(float3(1, 0, 0), radians(-15.0f));
lbm.voxelize_stl(get_exe_path()+"../stl/techtris_airplane.stl", center, rotation, size); // https://www.thingiverse.com/thing:2772812/files
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
lbm.graphics.set_camera_free(float3(1.0f*(float)Nx, -0.4f*(float)Ny, 2.0f*(float)Nz), -33.0f, 42.0f, 68.0f);
lbm.run(0u); // initialize simulation
while(lbm.get_t()<lbm_T) { // main simulation loop
if(lbm.graphics.next_frame(lbm_T, 10.0f)) lbm.graphics.write_frame(); // render enough frames 10 seconds of 60fps video
lbm.run(1u);
}
#else // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run();
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
} /**/
/*void main_setup() { // Star Wars X-wing; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 2.0f, 0.5f), 880u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 100000.0f;
const float lbm_u = 0.1f;
const uint lbm_T = 50000u;
LBM lbm(lbm_N, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float size = 1.0f*lbm.size().x;
const float3 center = float3(lbm.center().x, 0.55f*size, lbm.center().z);
const float3x3 rotation = float3x3(float3(0, 0, 1), radians(180.0f));
lbm.voxelize_stl(get_exe_path()+"../stl/X-Wing.stl", center, rotation, size); // https://www.thingiverse.com/thing:353276/files
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
lbm.run(0u); // initialize simulation
while(lbm.get_t()<lbm_T) { // main simulation loop
if(lbm.graphics.next_frame(lbm_T, 30.0f)) {
lbm.graphics.set_camera_free(float3(1.0f*(float)Nx, -0.4f*(float)Ny, 2.0f*(float)Nz), -33.0f, 42.0f, 68.0f);
lbm.graphics.write_frame(get_exe_path()+"export/t/");
lbm.graphics.set_camera_free(float3(0.5f*(float)Nx, -0.35f*(float)Ny, -0.7f*(float)Nz), -33.0f, -40.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/b/");
lbm.graphics.set_camera_free(float3(0.0f*(float)Nx, 0.51f*(float)Ny, 0.75f*(float)Nz), 90.0f, 28.0f, 80.0f);
lbm.graphics.write_frame(get_exe_path()+"export/f/");
lbm.graphics.set_camera_free(float3(0.7f*(float)Nx, -0.15f*(float)Ny, 0.06f*(float)Nz), 0.0f, 0.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/s/");
}
lbm.run(1u);
}
#else // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run();
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
} /**/
/*void main_setup() { // Star Wars TIE fighter; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 2.0f, 1.0f), 1760u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 100000.0f;
const float lbm_u = 0.125f;
const uint lbm_T = 50000u;
LBM lbm(lbm_N, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float size = 0.65f*lbm.size().x;
const float3 center = float3(lbm.center().x, 0.6f*size, lbm.center().z);
const float3x3 rotation = float3x3(float3(1, 0, 0), radians(90.0f));
Mesh* mesh = read_stl(get_exe_path()+"../stl/DWG_Tie_Fighter_Assembled_02.stl", lbm.size(), center, rotation, size); // https://www.thingiverse.com/thing:2919109/files
lbm.voxelize_mesh_on_device(mesh);
lbm.flags.read_from_device();
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run(0u); // initialize simulation
while(lbm.get_t()<lbm_T) { // main simulation loop
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
if(lbm.graphics.next_frame(lbm_T, 30.0f)) {
lbm.graphics.set_camera_free(float3(1.0f*(float)Nx, -0.4f*(float)Ny, 0.63f*(float)Nz), -33.0f, 33.0f, 80.0f);
lbm.graphics.write_frame(get_exe_path()+"export/t/");
lbm.graphics.set_camera_free(float3(0.3f*(float)Nx, -1.5f*(float)Ny, -0.45f*(float)Nz), -83.0f, -10.0f, 40.0f);
lbm.graphics.write_frame(get_exe_path()+"export/b/");
lbm.graphics.set_camera_free(float3(0.0f*(float)Nx, 0.57f*(float)Ny, 0.7f*(float)Nz), 90.0f, 29.5f, 80.0f);
lbm.graphics.write_frame(get_exe_path()+"export/f/");
lbm.graphics.set_camera_free(float3(2.5f*(float)Nx, 0.0f*(float)Ny, 0.0f*(float)Nz), 0.0f, 0.0f, 50.0f);
lbm.graphics.write_frame(get_exe_path()+"export/s/");
}
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run(28u);
const float3x3 rotation = float3x3(float3(0.2f, 1.0f, 0.1f), radians(0.4032f)); // create rotation matrix to rotate mesh
lbm.unvoxelize_mesh_on_device(mesh);
mesh->rotate(rotation); // rotate mesh
lbm.voxelize_mesh_on_device(mesh);
}
} /**/
/*void main_setup() { // radial fan; required extensions in defines.hpp: FP16S, MOVING_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(3.0f, 3.0f, 1.0f), 181u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 100000.0f;
const float lbm_u = 0.12f;
const uint lbm_T = 48000u;
const uint lbm_dt = 10u;
LBM lbm(lbm_N, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float radius = 0.25f*(float)lbm_N.x;
const float3 center = float3(lbm.center().x, lbm.center().y, 0.36f*radius);
const float lbm_omega=lbm_u/radius, lbm_domega=lbm_omega*lbm_dt;
Mesh* mesh = read_stl(get_exe_path()+"../stl/FAN_Solid_Bottom.stl", lbm.size(), center, 2.0f*radius); // https://www.thingiverse.com/thing:6113/files
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u) lbm.flags[n] = TYPE_S; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run(0u); // initialize simulation
while(lbm.get_t()<lbm_T) { // main simulation loop
lbm.voxelize_mesh_on_device(mesh, TYPE_S, center, float3(0.0f), float3(0.0f, 0.0f, lbm_omega));
lbm.run(lbm_dt);
mesh->rotate(float3x3(float3(0.0f, 0.0f, 1.0f), lbm_domega)); // rotate mesh
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
if(lbm.graphics.next_frame(lbm_T, 30.0f)) {
lbm.graphics.set_camera_free(float3(0.353512f*(float)Nx, -0.150326f*(float)Ny, 1.643939f*(float)Nz), -25.0f, 61.0f, 100.0f);
lbm.graphics.write_frame();
}
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
}
} /**/
/*void main_setup() { // electric ducted fan (EDF); required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, MOVING_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 1.5f, 1.0f), 8000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 1000000.0f;
const float lbm_u = 0.1f;
const uint lbm_T = 180000u;
const uint lbm_dt = 4u;
LBM lbm(lbm_N, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float3 center = lbm.center();
const float3x3 rotation = float3x3(float3(0, 0, 1), radians(180.0f));
Mesh* stator = read_stl(get_exe_path()+"../stl/edf_v39.stl", 1.0f, rotation); // https://www.thingiverse.com/thing:3014759/files
Mesh* rotor = read_stl(get_exe_path()+"../stl/edf_v391.stl", 1.0f, rotation); // https://www.thingiverse.com/thing:3014759/files
const float scale = 0.98f*stator->get_scale_for_box_fit(lbm.size()); // scale stator and rotor to simulation box size
stator->scale(scale);
rotor->scale(scale);
stator->translate(lbm.center()-stator->get_bounding_box_center()-float3(0.0f, 0.2f*stator->get_max_size(), 0.0f)); // move stator and rotor to simulation box center
rotor->translate(lbm.center()-rotor->get_bounding_box_center()-float3(0.0f, 0.41f*stator->get_max_size(), 0.0f));
stator->set_center(stator->get_bounding_box_center()); // set center of meshes to their bounding box center
rotor->set_center(rotor->get_bounding_box_center());
const float lbm_radius=0.5f*rotor->get_max_size(), omega=lbm_u/lbm_radius, domega=omega*(float)lbm_dt;
lbm.voxelize_mesh_on_device(stator, TYPE_S, center);
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]==0u) lbm.u.y[n] = 0.3f*lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run(0u); // initialize simulation
while(lbm.get_t()<lbm_T) { // main simulation loop
lbm.voxelize_mesh_on_device(rotor, TYPE_S, center, float3(0.0f), float3(0.0f, omega, 0.0f));
lbm.run(lbm_dt);
rotor->rotate(float3x3(float3(0.0f, 1.0f, 0.0f), domega)); // rotate mesh
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
if(lbm.graphics.next_frame(lbm_T, 30.0f)) {
lbm.graphics.set_camera_centered(-70.0f+100.0f*(float)lbm.get_t()/(float)lbm_T, 2.0f, 60.0f, 1.284025f);
lbm.graphics.write_frame();
}
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
}
} /**/
/*void main_setup() { // Mercedes F1 W14 car; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, MOVING_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 2.0f, 0.5f), 2000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_u = 0.08f;
const float si_u = 100.0f/3.6f;
const float si_length = 2.0f;
const float si_nu=1.48E-5f, si_rho=1.225f;
const float relative_length = 0.8f;
const float lbm_length = relative_length*(float)lbm_N.y;
units.set_m_kg_s(lbm_length, lbm_u, 1.0f, si_length, si_u, si_rho);
print_info("Re = "+to_string(to_uint(units.si_Re(si_length/5.5f*2.0f, si_u, si_nu))));
print_info("1s = "+to_string(units.t(1.0f)));
const float lbm_nu = units.nu(si_nu);
LBM lbm(lbm_N, lbm_nu);
// ###################################################################################### define geometry ######################################################################################
Mesh* body = read_stl(get_exe_path()+"../stl/mercedesf1-body.stl"); // https://downloadfree3d.com/3d-models/vehicles/sports-car/mercedes-f1-w14/
Mesh* front_wheels = read_stl(get_exe_path()+"../stl/mercedesf1-front-wheels.stl"); // wheels separated, decals removed and converted to .stl in Microsoft 3D Builder
Mesh* back_wheels = read_stl(get_exe_path()+"../stl/mercedesf1-back-wheels.stl"); // to avoid instability from too close gaps: remove front wheel fenders and move out right back wheel a bit
const float scale = relative_length/body->get_max_size()*lbm.size().y; // scale parts
body->scale(scale);
front_wheels->scale(scale);
back_wheels->scale(scale);
const float3 offset = float3(lbm.center().x-body->get_bounding_box_center().x, 1.0f-body->pmin.y+0.25f*back_wheels->get_min_size(), 4.0f-back_wheels->pmin.z);
body->translate(offset);
front_wheels->translate(offset);
back_wheels->translate(offset);
body->set_center(body->get_bounding_box_center()); // set center of meshes to their bounding box center
front_wheels->set_center(front_wheels->get_bounding_box_center());
back_wheels->set_center(back_wheels->get_bounding_box_center());
const float lbm_radius=0.5f*back_wheels->get_min_size(), omega=lbm_u/lbm_radius;
lbm.voxelize_mesh_on_device(body);
lbm.voxelize_mesh_on_device(front_wheels, TYPE_S, front_wheels->get_center(), float3(0.0f), float3(omega, 0.0f, 0.0f)); // make wheels rotating
lbm.voxelize_mesh_on_device(back_wheels, TYPE_S, back_wheels->get_center(), float3(0.0f), float3(omega, 0.0f, 0.0f)); // make wheels rotating
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==Nz-1u) lbm.flags[n] = TYPE_E;
if(z==0u) lbm.flags[n] = TYPE_S;
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
lbm.run(0u); // initialize simulation
while(lbm.get_t()<=units.t(1.0f)) { // main simulation loop
if(lbm.graphics.next_frame(units.t(si_T), 5.0f)) {
lbm.graphics.set_camera_free(float3(0.779346f*(float)Nx, -0.315650f*(float)Ny, 0.329444f*(float)Nz), -27.0f, 19.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/a/");
lbm.graphics.set_camera_free(float3(0.556877f*(float)Nx, 0.228191f*(float)Ny, 1.159613f*(float)Nz), 19.0f, 53.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/b/");
lbm.graphics.set_camera_free(float3(0.220650f*(float)Nx, -0.589529f*(float)Ny, 0.085407f*(float)Nz), -72.0f, 21.0f, 86.0f);
lbm.graphics.write_frame(get_exe_path()+"export/c/");
}
lbm.run(1u);
}
#else // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run();
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
} /**/
/*void main_setup() { // aerodynamics of a cow; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 2.0f, 1.0f), 1000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float si_u = 1.0f;
const float si_w = 0.8f;
const float si_nu=1.48E-5f, si_rho=1.225f;
const float si_T = 10.0f;
const float lbm_w = (float)lbm_N.x/3.0f;
const float lbm_u = 0.1f;
units.set_m_kg_s(lbm_w, lbm_u, 1.0f, si_w, si_u, si_rho);
print_info("Re = "+to_string(units.Re(si_w, si_u, si_nu), 2u));
const float lbm_nu = units.nu(si_nu);
LBM lbm(lbm_N, lbm_nu);
// ###################################################################################### define geometry ######################################################################################
const float size = 1.3f*lbm.size().x;
const float3x3 rotation = float3x3(float3(1, 0, 0), radians(180.0f))*float3x3(float3(0, 0, 1), radians(180.0f));
Mesh* mesh = read_stl(get_exe_path()+"../stl/Cow_t.stl", lbm.size(), lbm.center(), rotation, size); // https://www.thingiverse.com/thing:182114/files
mesh->translate(float3(0.0f, 1.0f-mesh->pmin.y+0.1f*size, 1.0f-mesh->pmin.z)); // move mesh forward a bit and to simulation box bottom, keep in mind 1 cell thick box boundaries
lbm.voxelize_mesh_on_device(mesh);
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(z==0u) lbm.flags[n] = TYPE_S; // solid floor
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u; // initialize y-velocity everywhere except in solid nodes
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all other simulation box boundaries are inflow/outflow
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
lbm.graphics.set_camera_centered(-40.0f, 20.0f, 78.0f, 1.25f);
lbm.run(0u); // initialize simulation
while(lbm.get_t()<=units.t(si_T)) { // main simulation loop
if(lbm.graphics.next_frame(units.t(si_T), 10.0f)) lbm.graphics.write_frame();
lbm.run(1u);
}
#else // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run();
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
} /**/
/*void main_setup() { // Space Shuttle; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 4.0f, 0.8f), 1000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 10000000.0f;
const float lbm_u = 0.1f;
const uint lbm_T = 108000u;
LBM lbm(lbm_N, 2u, 4u, 1u, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u)); // run on 2x4x1 = 8 GPUs
// ###################################################################################### define geometry ######################################################################################
const float size = 1.25f*lbm.size().x;
const float3 center = float3(lbm.center().x, 0.55f*size, lbm.center().z+0.05f*size);
const float3x3 rotation = float3x3(float3(1, 0, 0), radians(-20.0f))*float3x3(float3(0, 0, 1), radians(270.0f));
Clock clock;
lbm.voxelize_stl(get_exe_path()+"../stl/Full_Shuttle.stl", center, rotation, size); // https://www.thingiverse.com/thing:4975964/files
println(print_time(clock.stop()));
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_FLAG_SURFACE|VIS_Q_CRITERION;
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
lbm.write_status();
lbm.run(0u); // initialize simulation
while(lbm.get_t()<=lbm_T) { // main simulation loop
if(lbm.graphics.next_frame(units.t(si_T), 30.0f)) {
lbm.graphics.set_camera_free(float3(-1.435962f*(float)Nx, 0.364331f*(float)Ny, 1.344426f*(float)Nz), -205.0f, 36.0f, 74.0f); // top
lbm.graphics.write_frame(get_exe_path()+"export/top/");
lbm.graphics.set_camera_free(float3(-1.021207f*(float)Nx, -0.518006f*(float)Ny, 0.0f*(float)Nz), -137.0f, 0.0f, 74.0f); // bottom
lbm.graphics.write_frame(get_exe_path()+"export/bottom/");
}
lbm.run(1u);
}
lbm.write_status();
#else // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run();
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
} /**/
/*void main_setup() { // Starship; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 2.0f, 2.0f), 1000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_Re = 10000000.0f;
const float lbm_u = 0.05f;
const uint lbm_T = 108000u;
LBM lbm(lbm_N, 1u, 1u, 1u, units.nu_from_Re(lbm_Re, (float)lbm_N.x, lbm_u));
// ###################################################################################### define geometry ######################################################################################
const float size = 1.6f*lbm.size().x;
const float3 center = float3(lbm.center().x, lbm.center().y+0.05f*size, 0.18f*size);
lbm.voxelize_stl(get_exe_path()+"../stl/StarShipV2.stl", center, size); // https://www.thingiverse.com/thing:4912729/files
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.z[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE|VIS_FLAG_SURFACE|VIS_Q_CRITERION;
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
lbm.write_status();
lbm.run(0u); // initialize simulation
while(lbm.get_t()<=lbm_T) { // main simulation loop
if(lbm.graphics.next_frame(units.t(si_T), 20.0f)) {
lbm.graphics.set_camera_free(float3(2.116744f*(float)Nx, -0.775261f*(float)Ny, 1.026577f*(float)Nz), -38.0f, 37.0f, 60.0f); // top
lbm.graphics.write_frame(get_exe_path()+"export/top/");
lbm.graphics.set_camera_free(float3(0.718942f*(float)Nx, 0.311263f*(float)Ny, -0.498366f*(float)Nz), 32.0f, -40.0f, 104.0f); // bottom
lbm.graphics.write_frame(get_exe_path()+"export/bottom/");
lbm.graphics.set_camera_free(float3(1.748119f*(float)Nx, 0.442782f*(float)Ny, 0.087945f*(float)Nz), 24.0f, 2.0f, 92.0f); // side
lbm.graphics.write_frame(get_exe_path()+"export/side/");
}
lbm.run(1u);
}
lbm.write_status();
#else // GRAPHICS && !INTERACTIVE_GRAPHICS
lbm.run();
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
} /**/
/*void main_setup() { // Ahmed body; required extensions in defines.hpp: FP16C, FORCE_FIELD, EQUILIBRIUM_BOUNDARIES, SUBGRID, optionally INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint memory = 8000u; // available VRAM of GPU(s) in MB
const float lbm_u = 0.05f;
const float box_scale = 6.0f;
const float si_u = 60.0f;
const float si_nu=1.48E-5f, si_rho=1.225f;
const float si_width=0.389f, si_height=0.288f, si_length=1.044f;
const float si_A = si_width*si_height+2.0f*0.05f*0.03f;
print_info("Re = "+to_string(to_uint(units.si_Re(si_width, si_u, si_nu))));
const float Lx = units.x(box_scale*si_width);
const float Ly = units.x(box_scale*si_length);
const float Lz = units.x(0.5f*(box_scale-1.0f)*si_width+si_height);
const uint3 lbm_N = resolution(float3(Lx, Ly, Lz), memory); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
units.set_m_kg_s((float)lbm_N.y, lbm_u, 1.0f, box_scale*si_length, si_u, si_rho);
const float lbm_nu = units.nu(si_nu);
const float lbm_length = units.x(si_length);
LBM lbm(lbm_N, lbm_nu);
// ###################################################################################### define geometry ######################################################################################
Mesh* mesh = read_stl(get_exe_path()+"../stl/ahmed_25deg_m.stl", lbm.size(), lbm.center(), float3x3(float3(0, 0, 1), radians(90.0f)), lbm_length);
mesh->translate(float3(0.0f, units.x(0.5f*(0.5f*box_scale*si_length-si_width))-mesh->pmin.y, 1.0f-mesh->pmin.z));
lbm.voxelize_mesh_on_device(mesh, TYPE_S|TYPE_X); // https://github.com/nathanrooy/ahmed-bluff-body-cfd/blob/master/geometry/ahmed_25deg_m.stl converted to binary
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(z==0u) lbm.flags[n] = TYPE_S;
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==Nz-1u) lbm.flags[n] = TYPE_E;
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.run(0u); // initialize simulation
//write_file(get_exe_path()+"Cd.dat", "# t\tCd\n");
while(true) { // main simulation loop
lbm.calculate_force_on_boundaries();
lbm.F.read_from_device();
const float3 lbm_force = lbm.calculate_force_on_object(TYPE_S|TYPE_X);
const float Cd = units.si_F(lbm_force.y)/(0.5f*si_rho*sq(si_u)*si_A); // expect Cd to be too large by a factor 1.3-2.0x; need wall model
println("\r"+to_string(Cd, 3u)+" ");
//write_line(get_exe_path()+"Cd.dat", to_string(lbm.get_t())+"\t"+to_string(Cd, 3u)+"\n");
lbm.run(100u);
}
} /**/
/*void main_setup() { // Cessna 172 propeller aircraft; required extensions in defines.hpp: FP16S, EQUILIBRIUM_BOUNDARIES, MOVING_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 0.8f, 0.25f), 1155u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_u = 0.1f;
const uint lbm_dt = 4u; // revoxelize rotor every dt time steps
const float si_T = 0.1f;
const float si_x = 11.0f;
const float si_u = 226.0f/3.6f;
const float si_nu=1.48E-5f, si_rho=1.225f;
print_info("Re = "+to_string(to_uint(units.si_Re(si_x, si_u, si_nu))));
units.set_m_kg_s(0.95f*(float)lbm_N.x, lbm_u, 1.0f, si_x, si_u, si_rho);
const float lbm_nu = units.nu(si_nu);
print_info("1s = "+to_string(units.t(1.0f))+" time steps");
print_info("1 length = "+to_string(units.t(si_x/si_u))+" time steps");
LBM lbm(lbm_N, lbm_nu);
// ###################################################################################### define geometry ######################################################################################
Mesh* plane = read_stl(get_exe_path()+"../stl/Cessna-172-Skyhawk-body.stl"); // https://www.thingiverse.com/thing:814319/files
Mesh* rotor = read_stl(get_exe_path()+"../stl/Cessna-172-Skyhawk-rotor.stl"); // plane and rotor separated with Microsoft 3D Builder
const float scale = 0.95f*plane->get_scale_for_box_fit(lbm.size()); // scale plane and rotor to simulation box size
plane->scale(scale);
rotor->scale(scale);
const float3 offset = lbm.center()-plane->get_bounding_box_center(); // move plane and rotor to simulation box center
plane->translate(offset);
rotor->translate(offset);
plane->set_center(plane->get_bounding_box_center()); // set center of meshes to their bounding box center
rotor->set_center(rotor->get_bounding_box_center());
const float lbm_radius=0.5f*rotor->get_max_size(), omega=-lbm_u/lbm_radius, domega=omega*(float)lbm_dt;
lbm.voxelize_mesh_on_device(plane);
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run(0u); // initialize simulation
while(lbm.get_t()<=units.t(si_T)) { // main simulation loop
lbm.voxelize_mesh_on_device(rotor, TYPE_S, rotor->get_center(), float3(0.0f), float3(0.0f, omega, 0.0f)); // revoxelize mesh on GPU
lbm.run(lbm_dt); // run dt time steps
rotor->rotate(float3x3(float3(0.0f, 1.0f, 0.0f), domega)); // rotate mesh
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
if(lbm.graphics.next_frame(units.t(si_T), 5.0f)) {
lbm.graphics.set_camera_free(float3(0.192778f*(float)Nx, -0.669183f*(float)Ny, 0.657584f*(float)Nz), -77.0f, 27.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/a/");
lbm.graphics.set_camera_free(float3(0.224926f*(float)Nx, -0.594332f*(float)Ny, -0.277894f*(float)Nz), -65.0f, -14.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/b/");
lbm.graphics.set_camera_free(float3(-0.000000f*(float)Nx, 0.650189f*(float)Ny, 1.461048f*(float)Nz), 90.0f, 40.0f, 100.0f);
lbm.graphics.write_frame(get_exe_path()+"export/c/");
}
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
}
} /**/
/*void main_setup() { // Bell 222 helicopter; required extensions in defines.hpp: FP16C, EQUILIBRIUM_BOUNDARIES, MOVING_BOUNDARIES, SUBGRID, INTERACTIVE_GRAPHICS or GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint3 lbm_N = resolution(float3(1.0f, 1.2f, 0.3f), 1000u); // input: simulation box aspect ratio and VRAM occupation in MB, output: grid resolution
const float lbm_u = 0.16f;
const float relative_length = 0.9f;
const uint lbm_dt = 4u; // revoxelize rotor every dt time steps
const float si_T = 0.34483f; // 2 revolutions of the main rotor
const float si_length=12.85f, si_d=12.12f, si_rpm=348.0f;
const float si_nu=1.48E-5f, si_rho=1.225f;
const float si_u = si_rpm/60.0f*si_d*pif;
units.set_m_kg_s(relative_length*(float)lbm_N.x, lbm_u, 1.0f, si_length, si_u, si_rho);
print_info("1 second = "+to_string(units.t(1.0f))+" time steps");
print_info("1 cell = "+to_string(1000.0f*units.si_x(1.0f), 2u)+" mm");
const float lbm_nu = units.nu(si_nu);
LBM lbm(lbm_N, lbm_nu);
// ###################################################################################### define geometry ######################################################################################
Mesh* body = read_stl(get_exe_path()+"../stl/Bell-222-body.stl"); // https://www.thingiverse.com/thing:1625155/files
Mesh* main = read_stl(get_exe_path()+"../stl/Bell-222-main.stl"); // body and rotors separated with Microsoft 3D Builder
Mesh* back = read_stl(get_exe_path()+"../stl/Bell-222-back.stl");
const float scale = 0.9f*body->get_scale_for_box_fit(lbm.size()); // scale plane and rotor to simulation box size
body->scale(scale);
main->scale(scale);
back->scale(scale);
const float3 offset = lbm.center()-body->get_bounding_box_center(); // move plane and rotor to simulation box center
body->translate(offset);
main->translate(offset);
back->translate(offset);
body->set_center(body->get_bounding_box_center()); // set center of meshes to their bounding box center
main->set_center(main->get_bounding_box_center());
back->set_center(back->get_bounding_box_center());
const float main_radius=0.5f*main->get_max_size(), main_omega=lbm_u/main_radius, main_domega=main_omega*(float)lbm_dt;
const float back_radius=0.5f*back->get_max_size(), back_omega=-lbm_u/back_radius, back_domega=back_omega*(float)lbm_dt;
lbm.voxelize_mesh_on_device(body);
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(lbm.flags[n]!=TYPE_S) lbm.u.y[n] = 0.2f*lbm_u;
if(lbm.flags[n]!=TYPE_S) lbm.u.z[n] = -0.1f*lbm_u;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_E; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_SURFACE|VIS_Q_CRITERION;
lbm.run(0u); // initialize simulation
while(lbm.get_t()<=units.t(si_T)) { // main simulation loop
lbm.voxelize_mesh_on_device(main, TYPE_S, main->get_center(), float3(0.0f), float3(0.0f, 0.0f, main_omega)); // revoxelize mesh on GPU
lbm.voxelize_mesh_on_device(back, TYPE_S, back->get_center(), float3(0.0f), float3(back_omega, 0.0f, 0.0f)); // revoxelize mesh on GPU
lbm.run(lbm_dt); // run dt time steps
main->rotate(float3x3(float3(0.0f, 0.0f, 1.0f), main_domega)); // rotate mesh
back->rotate(float3x3(float3(1.0f, 0.0f, 0.0f), back_domega)); // rotate mesh
#if defined(GRAPHICS) && !defined(INTERACTIVE_GRAPHICS)
if(lbm.graphics.next_frame(units.t(si_T), 10.0f)) {
lbm.graphics.set_camera_free(float3(0.528513f*(float)Nx, 0.102095f*(float)Ny, 1.302283f*(float)Nz), 16.0f, 47.0f, 96.0f);
lbm.graphics.write_frame(get_exe_path()+"export/a/");
lbm.graphics.set_camera_free(float3(0.0f*(float)Nx, -0.114244f*(float)Ny, 0.543265f*(float)Nz), 90.0f+degrees((float)lbm.get_t()/(float)lbm_dt*main_domega), 36.0f, 120.0f);
lbm.graphics.write_frame(get_exe_path()+"export/b/");
lbm.graphics.set_camera_free(float3(0.557719f*(float)Nx, -0.503388f*(float)Ny, -0.591976f*(float)Nz), -43.0f, -21.0f, 75.0f);
lbm.graphics.write_frame(get_exe_path()+"export/c/");
lbm.graphics.set_camera_centered(58.0f, 9.0f, 88.0f, 1.648722f);
lbm.graphics.write_frame(get_exe_path()+"export/d/");
lbm.graphics.set_camera_centered(0.0f, 90.0f, 100.0f, 1.100000f);
lbm.graphics.write_frame(get_exe_path()+"export/e/");
lbm.graphics.set_camera_free(float3(0.001612f*(float)Nx, 0.523852f*(float)Ny, 0.992613f*(float)Nz), 90.0f, 37.0f, 94.0f);
lbm.graphics.write_frame(get_exe_path()+"export/f/");
}
#endif // GRAPHICS && !INTERACTIVE_GRAPHICS
}
} /**/
/*void main_setup() { // hydraulic jump; required extensions in defines.hpp: FP16S, VOLUME_FORCE, EQUILIBRIUM_BOUNDARIES, SURFACE, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
LBM lbm(96u, 352u, 96u, 1u, 1u, 1u, 0.007f, 0.0f, 0.0f, -0.0005f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
const uint H1=Nz*2u/5u, H2=Nz*3u/5u, P1=Ny*1u/20u, P3=Ny*3u/20u;
if(z<H2) lbm.flags[n] = TYPE_F;
if(y<P3&&z< H1) lbm.flags[n] = TYPE_S;
if(y<P1&&z>=H2) lbm.flags[n] = TYPE_S;
if(y==1u&&z>=H1&&z<H2) {
lbm.flags[n] = TYPE_E;
lbm.rho[n] = 1.55f;
}
if(y==Ny-2u) {
lbm.flags[n] = TYPE_E;
lbm.u.y[n] = 0.2f/5.0f;
lbm.rho[n] = 0.99f;
}
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = lbm.get_D()==1u ? VIS_PHI_RAYTRACE : VIS_PHI_RASTERIZE;
lbm.run();
//lbm.run(1000u); lbm.u.read_from_device(); println(lbm.u.x[lbm.index(Nx/2u, Ny/4u, Nz/4u)]); wait(); // test for binary identity
} /**/
/*void main_setup() { // dam break; required extensions in defines.hpp: FP16S, VOLUME_FORCE, SURFACE, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
LBM lbm(128u, 256u, 256u, 0.005f, 0.0f, 0.0f, -0.0002f, 0.0001f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(z<Nz*6u/8u && y<Ny/8u) lbm.flags[n] = TYPE_F;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = lbm.get_D()==1u ? VIS_PHI_RAYTRACE : VIS_PHI_RASTERIZE;
lbm.run();
} /**/
/*void main_setup() { // liquid metal on a speaker; required extensions in defines.hpp: FP16S, VOLUME_FORCE, MOVING_BOUNDARIES, SURFACE, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const uint L = 128u;
const float u = 0.09f; // peak velocity of speaker membrane
const float f = 0.0005f;
const float frequency = 0.01f; // amplitude = u/(2.0f*pif*frequency);
LBM lbm(L, L, L*3u/4u, 0.01f, 0.0f, 0.0f, -f, 0.005f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
if(z<Nz/3u && x>0u&&x<Nx-1u&&y>0u&&y<Ny-1u&&z>0u&&z<Nz-1u) {
lbm.rho[n] = units.rho_hydrostatic(f, (float)z, (float)(Nz/3u));
lbm.u.x[n] = random_symmetric(1E-9f);
lbm.u.y[n] = random_symmetric(1E-9f);
lbm.u.z[n] = random_symmetric(1E-9f);
lbm.flags[n] = TYPE_F;
}
if(z==0u) lbm.u.z[n] = 1E-16f;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // all non periodic
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = lbm.get_D()==1u ? VIS_PHI_RAYTRACE : VIS_PHI_RASTERIZE;
lbm.run(0u); // initialize simulation
while(true) { // main simulation loop
lbm.u.read_from_device();
const float uz = u*sin(2.0f*pif*frequency*(float)lbm.get_t());
for(uint z=0u; z<1u; z++) {
for(uint y=1u; y<Ny-1u; y++) {
for(uint x=1u; x<Nx-1u; x++) {
const uint n = x+(y+z*Ny)*Nx;
lbm.u.z[n] = uz;
}
}
}
lbm.u.write_to_device();
lbm.run(1u);
}
} /**/
/*void main_setup() { // breaking waves on beach; required extensions in defines.hpp: FP16S, VOLUME_FORCE, EQUILIBRIUM_BOUNDARIES, SURFACE, INTERACTIVE_GRAPHICS
// ################################################################## define simulation box size, viscosity and volume force ###################################################################
const float f = 0.001f; // make smaller
const float u = 0.12f; // peak velocity of speaker membrane
const float frequency = 0.0007f; // amplitude = u/(2.0f*pif*frequency);
LBM lbm(128u, 640u, 96u, 0.01f, 0.0f, 0.0f, -f);
// ###################################################################################### define geometry ######################################################################################
const uint Nx=lbm.get_Nx(), Ny=lbm.get_Ny(), Nz=lbm.get_Nz(); for(ulong n=0ull; n<lbm.get_N(); n++) { uint x=0u, y=0u, z=0u; lbm.coordinates(n, x, y, z);
const uint H = Nz/2u;
if(z<H) {
lbm.flags[n] = TYPE_F;
lbm.rho[n] = units.rho_hydrostatic(f, (float)z, (float)H);
}
if(plane(x, y, z, float3(lbm.center().x, 128.0f, 0.0f), float3(0.0f, -1.0f, 8.0f))) lbm.flags[n] = TYPE_S;
if(x==0u||x==Nx-1u||y==0u||y==Ny-1u||z==0u||z==Nz-1u) lbm.flags[n] = TYPE_S; // all non periodic
if(y==0u && x>0u&&x<Nx-1u&&z>0u&&z<Nz-1u) lbm.flags[n] = TYPE_E;
} // ######################################################################### run simulation, export images and data ##########################################################################
lbm.graphics.visualization_modes = VIS_FLAG_LATTICE | (lbm.get_D()==1u ? VIS_PHI_RAYTRACE : VIS_PHI_RASTERIZE);
lbm.run(0u); // initialize simulation
while(true) { // main simulation loop
lbm.u.read_from_device();
const float uy = u*sin(2.0f*pif*frequency*(float)lbm.get_t());
const float uz = 0.5f*u*cos(2.0f*pif*frequency*(float)lbm.get_t());
for(uint z=1u; z<Nz-1u; z++) {
for(uint y=0u; y<1u; y++) {
for(uint x=1u; x<Nx-1u; x++) {
const uint n = x+(y+z*Ny)*Nx;
lbm.u.y[n] = uy;
lbm.u.z[n] = uz;
}
}
}
lbm.u.write_to_device();
lbm.run(100u);
}
} /**/