main.c

/*

Authors:
 - Adrián Navas Montilla
 - Isabel Echeverribar

Copyright (C) 2019-2024 The authors.

License type: The 3-Clause BSD License

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This software is provided by the copyright holders and contributors “as is” and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the copyright holder or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.

File:
  - main.c

Content:
  -This file contains the main code of the solver.
   It uses functions which are distributed in libraries within lib/ folder

*/

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <omp.h>

#include "lib/definitions.h"
#include "lib/structures.h"
#include "lib/closures.h"
#include "lib/ibmutils.h"
#include "lib/mathutils.h"
#include "lib/numcore.h"
#include "lib/postproc.h"
#include "lib/preproc.h"
#include "lib/reconst.h"
#include "lib/solvers.h"

int main(int argc, char * argv[]){
	t_mesh *mesh;
	t_sim *sim;
	t_solid *solids;
	char vtkfile[1024];
	char listfile[1024];
	double tf,timeac;
	int nIt;
#if WRITE_TKE
	double timeac2,tTke;
	FILE *file_tke;
#endif

	if (argc < 2) {
		printf("%s A folder path must be passed as follows: %s <folder_path>\n", ERR, argv[0]);
		return 1; // Exit 
	}
	const char *folder_path = argv[1];

#ifdef _OPENMP
	omp_set_num_threads(NTHREADS);
	printf("The number of threads is set to %d.\n",NTHREADS);
#pragma omp parallel
	printf("Thread %d of %d is checked.\n", omp_get_thread_num(), omp_get_num_threads());

#endif

	////////////////////////////////////////////////////
	///////////// M E M O R Y  A L L O C. //////////////
	////////////////////////////////////////////////////

	//Mesh allocation
	mesh=(t_mesh*)malloc(sizeof(t_mesh));
	//Simulation allocation
	sim=(t_sim*)malloc(sizeof(t_sim));
	//Solids allocation
	solids=(t_solid*)malloc(sizeof(t_solid));


	////////////////////////////////////////////////////
	////////////// P R E - P R O C E S S ///////////////
	////////////////////////////////////////////////////
	
	read_config(mesh,sim,folder_path);
	print_info(mesh,sim,folder_path);

#if EQUATION_SYSTEM == 2	//Definition of the number of conserved variables
	sim->nvar=6;
#else
	sim->nvar=1;
#endif

	if(sim->order==1){	//Definition of the Runge-Kutta steps depending on the spatial order of accuracy
		sim->rk_steps=1;
	}else{
		sim->rk_steps=3;
	}

	mesh->dx= mesh->Lx/mesh->xcells;
	mesh->dy= mesh->Ly/mesh->ycells;
	mesh->dz= mesh->Lz/mesh->zcells;

	timeac=0.0;
#if WRITE_TKE
	timeac2=0.0;
	tTke=0.05;
#endif    

	////////////////////////////////////////////////////
	////////// I N I T I A L I Z A T I O N /////////////
	////////////////////////////////////////////////////
	
	create_mesh(mesh,sim);				//This creates the mesh and defines connectivity
#if ALLOW_SOLIDS
	read_solids(mesh,solids,folder_path);	//This read solid bodies
#else
	solids->nsolid=0;
#endif
	assign_cell_type(mesh,solids);		//This assigns the type of cell (normal,solid,ghost,...)
	update_stencils(mesh,sim);			//This defines and updates the stencils for HO reconstructions
	assign_wall_type(mesh);    			//This defines the wall types (boundary wall, inner wall, ...)
	update_initial(mesh,sim,folder_path);	//This defines the initial condition, which may be read from file

#if ALLOW_SOLIDS
	assign_image_cells(mesh,solids);
	update_ghost_cells(sim,mesh,solids);
	update_wall_type(mesh,solids);
	printf("%s Image points have been defined and ghost cell values have been computed \n",OK);
#endif

#if EQUATION_SYSTEM == 0
	set_velocity(mesh,sim);
#endif
	
	snprintf(vtkfile, sizeof(vtkfile),"%s/out/inital_geo_mesh.vtk", folder_path);
	write_geo_vtk(mesh,vtkfile);
	snprintf(vtkfile, sizeof(vtkfile),"%s/out/state000.vtk", folder_path);
	write_vtk(mesh,vtkfile);
	snprintf(listfile, sizeof(listfile),"%s/out/state000.out", folder_path);
	write_list(mesh,listfile);
	snprintf(listfile, sizeof(listfile),"%s/out/list_eq.out", folder_path);
	write_list_eq(mesh,listfile);
	printf("\n");
	printf(" T= 0.0e+0. Initial data printed. Starting time loop.\n");

#if WRITE_TKE == 1
	snprintf(listfile, sizeof(listfile),"%s/out/tke.out", folder_path);
	file_tke=fopen(listfile,"w");
#endif

	mass_calculation(mesh,sim);			//Computing the total mass
	energy_calculation(mesh,sim);			//Computing the total energy
	mesh->mass0=mesh->mass;
	mesh->energy0=mesh->energy;

	////////////////////////////////////////////////////
	////////////// C A L C U L A T I O N ///////////////
	////////////////////////////////////////////////////

	tf=sim->tf;
	sim->t=0.0;
	nIt=0;

	#if ST!=0&&EQUATION_SYSTEM==2
	equilibrium_reconstruction(mesh,sim);	//High order reconstruction for the equilibrium variables (atmospheric cases)
	#endif

	while(sim->t<tf){
		
		update_solution(mesh,sim,solids,sim->rk_steps); //This updates all variables one time step

		if(mesh->cell_bc_flag!=1){
			update_cell_boundaries(mesh);
		}

		timeac=timeac+sim->dt;
		sim->t+=sim->dt;	//Time for the next time step

		if(timeac>sim->tVolc){
			screen_info(mesh,sim);
			#if WRITE_VTK
			snprintf(vtkfile, sizeof(vtkfile), "%s/out/state%03d.vtk", folder_path, nIt + 1);
			write_vtk(mesh,vtkfile);
			#endif
			#if WRITE_LIST
			snprintf(listfile, sizeof(listfile), "%s/out/state%03d.out", folder_path, nIt + 1);
			write_list(mesh,listfile);
			#endif
			nIt++;	
			timeac=0.0;
		}

		#if WRITE_TKE
		timeac2=timeac2+sim->dt;
		if(timeac2>tTke){
		tke_calculation(mesh,sim);
		fprintf(file_tke,"%14.14e %14.14e\n",sim->t,mesh->tke);
			timeac2=0.0;
		}
		#endif
	}

	printf(" \n");
	printf(" Final time is T= %14.14e \n \n",sim->t);

	if(timeac>TOL14){
		snprintf(vtkfile, sizeof(vtkfile), "%s/out/state%03d.vtk", folder_path, nIt + 1);
		write_vtk(mesh,vtkfile);
		snprintf(listfile, sizeof(listfile), "%s/out/state%03d.out", folder_path, nIt + 1);
		write_list(mesh,listfile);
	}

	#if WRITE_TKE
	fclose(file_tke);
	#endif

	printf("\n%s Simulation completed!\n",END);

	return 1;

}