-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathNitscheBoundary.cpp
549 lines (544 loc) · 23.4 KB
/
NitscheBoundary.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
#define EIGEN_NO_DEBUG
#include <iostream>
#include <cmath>
#include <stdlib.h>
#include <vector>
#include <iomanip>
#include "spline.h"
#include <eigen3/Eigen/Dense>
#include <eigen3/Eigen/Sparse>
#include <eigen3/unsupported/Eigen/KroneckerProduct>
using namespace std;
using namespace spline;
using namespace Eigen;
void GenerateKnot(int order, int refine, int insert, double* insert_knot,
double* & knot, int& m);
void CombineKnot(double* knot1, int m1, double* knot2, int m2, double* & knot,
int& m);
void Geometry(double xi, double eta, double& pxpxi, double& pxpeta,
double& pypxi, double& pypeta);
void CompToPhy_patch1(double xi, double eta, double& x, double& y);
void CompToPhy_patch2(double xi, double eta, double& x, double& y);
void AnalyticalDeformation(double x, double y, double L, double D, double I,
double P, double E,
double nu,
Vector2d& deformation);
void AnalyticalStress(double x, double y, double L, double D, double I,
double P, Vector3d& stress);
int main() {
double P = -1000;
double E = 1e9;
double nu = 0.3;
double L = 4;
double D = 2;
double I = D * D * D / 12;
double* gaussian = x7;
double* weight = w7;
int gaussian_points = 7;
MatrixXd DD(3, 3);
DD << 1 - nu, nu, 0, nu, 1 - nu, 0, 0, 0, (1.0 - 2 * nu) / 2;
DD *= E / (1 + nu) / (1 - 2 * nu);
int order;
int refine = 4;
cout << "order" << endl;
cin >> order;
cout << "refine" << endl;
cin >> refine;
int m_x_patch1, m_y_patch1;
int m_x_patch2, m_y_patch2;
int p_x = order, p_y = order;
double* knots_x_patch1, *knots_y_patch1;
double* knots_x_patch2, *knots_y_patch2;
double insertion_patch1[] = {.5};
double insertion_patch2[] = {1.0 / 3, 2.0 / 3 };
GenerateKnot(p_x, refine, 1, insertion_patch1, knots_x_patch1, m_x_patch1);
GenerateKnot(p_y, refine, 1, insertion_patch1, knots_y_patch1, m_y_patch1);
GenerateKnot(p_x, refine, 2, insertion_patch2, knots_x_patch2, m_x_patch2);
GenerateKnot(p_y, refine, 2, insertion_patch2, knots_y_patch2, m_y_patch2);
double* knots_y_coupling;
int m_y_coupling;
CombineKnot(knots_y_patch1, m_y_patch1, knots_y_patch2, m_y_patch2,
knots_y_coupling,
m_y_coupling);
int dof_x_patch1 = m_x_patch1 - p_x, dof_y_patch1 = m_y_patch1 - p_y,
dof_x_patch2 = m_x_patch2 - p_x,
dof_y_patch2 = m_y_patch2 - p_y;
int dof_patch1 = dof_x_patch1 * dof_y_patch1,
dof_patch2 = dof_x_patch2 * dof_y_patch2;
int elements_x_patch1 = m_x_patch1 - 2 * p_x,
elements_y_patch1 = m_y_patch1 - 2 * p_y,
elements_x_patch2 = m_x_patch2 - 2 * p_x,
elements_y_patch2 = m_y_patch2 - 2 * p_y;
int elements_y_coupling = m_y_coupling - 2 * p_y;
MatrixXd M = MatrixXd::Zero(dof_y_patch2, dof_y_patch2),
N2N1 = MatrixXd::Zero(dof_y_patch2, dof_y_patch1);
for (int ii_y = 0; ii_y < elements_y_coupling; ii_y++) {
double J_y = (knots_y_coupling[ii_y + p_y + 1] - knots_y_coupling[ii_y + p_y]) /
2;
double Middle_y = (knots_y_coupling[ii_y + p_y + 1] + knots_y_coupling[ii_y +
p_y]) / 2;
int i_y_patch1 = Findspan(m_y_patch1, p_y, knots_y_patch1, Middle_y);
int i_y_patch2 = Findspan(m_y_patch2, p_y, knots_y_patch2, Middle_y);
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_y_patch1, **ders_y_patch2;
DersBasisFuns(i_y_patch1, eta, p_y, knots_y_patch1, 0, ders_y_patch1);
DersBasisFuns(i_y_patch2, eta, p_y, knots_y_patch2, 0, ders_y_patch2);
VectorXd Neta_patch1 = VectorXd::Zero(dof_y_patch1),
Neta_patch2 = VectorXd::Zero(dof_y_patch2);
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta_patch1(i_y_patch1 - p_y + kk_y) = ders_y_patch1[0][kk_y];
Neta_patch2(i_y_patch2 - p_y + kk_y) = ders_y_patch2[0][kk_y];
}
for (int k = 0; k < 1; k++)
delete ders_y_patch1[k];
delete[] ders_y_patch1;
for (int k = 0; k < 1; k++)
delete ders_y_patch2[k];
delete[] ders_y_patch2;
M += weight[jj_y] * Neta_patch2 * Neta_patch2.transpose() * J_y;;
N2N1 += weight[jj_y] * Neta_patch2 * Neta_patch1.transpose() * J_y;
}
}
MatrixXd Iden = MatrixXd::Identity(2, 2);
MatrixXd Q1 = kroneckerProduct(M, Iden);
MatrixXd Q2 = kroneckerProduct(N2N1.transpose(), Iden);
MatrixXd K_patch1 = MatrixXd::Zero(2 * dof_patch1, 2 * dof_patch1);
for (int ii_x = 0; ii_x < elements_x_patch1; ii_x++) {
double J_x = (knots_x_patch1[ii_x + p_x + 1] - knots_x_patch1[ii_x + p_x]) / 2;
double Middle_x = (knots_x_patch1[ii_x + p_x + 1] + knots_x_patch1[ii_x +
p_x]) / 2;
int i_x = Findspan(m_x_patch1, p_x, knots_x_patch1, Middle_x);
for (int ii_y = 0; ii_y < elements_y_patch1; ii_y++) {
double J_y = (knots_y_patch1[ii_y + p_y + 1] - knots_y_patch1[ii_y + p_y]) / 2;
double Middle_y = (knots_y_patch1[ii_y + p_y + 1] + knots_y_patch1[ii_y +
p_y]) / 2;
int i_y = Findspan(m_y_patch1, p_y, knots_y_patch1, Middle_y);
for (int jj_x = 0; jj_x < gaussian_points; jj_x++) {
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double xi = Middle_x + J_x * gaussian[jj_x];
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_x, **ders_y;
DersBasisFuns(i_x, xi, p_x, knots_x_patch1, 1, ders_x);
DersBasisFuns(i_y, eta, p_y, knots_y_patch1, 1, ders_y);
VectorXd Nxi(p_x + 1), Nxi_xi(p_x + 1), Neta(p_y + 1), Neta_eta(p_y + 1);
for (int kk_x = 0; kk_x < p_x + 1; kk_x++) {
Nxi(kk_x) = ders_x[0][kk_x];
Nxi_xi(kk_x) = ders_x[1][kk_x];
}
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta(kk_y) = ders_y[0][kk_y];
Neta_eta(kk_y) = ders_y[1][kk_y];
}
for (int k = 0; k < 2; k++)
delete ders_x[k];
delete[] ders_x;
for (int k = 0; k < 2; k++)
delete ders_y[k];
delete[] ders_y;
VectorXd Nxi_xiNeta, NxiNeta_eta;
Nxi_xiNeta = kroneckerProduct(Nxi_xi, Neta);
NxiNeta_eta = kroneckerProduct(Nxi, Neta_eta);
double pxpxi, pxpeta, pypxi, pypeta;
Geometry(xi, eta, pxpxi, pxpeta, pypxi, pypeta);
double Jacobian = pxpxi * pypeta - pxpeta * pypxi;
VectorXd Nx_xNy, NxNy_y;
Nx_xNy = 1.0 / Jacobian * (Nxi_xiNeta * pypeta - NxiNeta_eta * pypxi);
NxNy_y = 1.0 / Jacobian * (-Nxi_xiNeta * pxpeta + NxiNeta_eta * pxpxi);
for (int kkx = 0; kkx < (p_x + 1) * (p_y + 1); kkx++) {
for (int kky = 0; kky < (p_x + 1) * (p_y + 1); kky++) {
MatrixXd Bx(3, 2);
MatrixXd By(3, 2);
Bx << Nx_xNy(kkx), 0, 0, NxNy_y(kkx), NxNy_y(kkx), Nx_xNy(kkx);
By << Nx_xNy(kky), 0, 0, NxNy_y(kky), NxNy_y(kky), Nx_xNy(kky);
K_patch1.block(2 * ((m_y_patch1 - p_y) * (kkx / (p_y + 1) + i_x - p_x) + kkx %
(p_y + 1) + i_y - p_y), 2 * ((m_y_patch1 - p_y) * (kky /
(p_y + 1) + i_x - p_x) + kky
% (p_y + 1) + i_y - p_y), 2,
2) += weight[jj_x] * weight[jj_y] * Jacobian * Bx.transpose() * DD * By * J_x *
J_y;
}
}
}
}
}
}
MatrixXd K_patch2 = MatrixXd::Zero(2 * dof_patch2, 2 * dof_patch2);
for (int ii_x = 0; ii_x < elements_x_patch2; ii_x++) {
double J_x = (knots_x_patch2[ii_x + p_x + 1] - knots_x_patch2[ii_x + p_x]) / 2;
double Middle_x = (knots_x_patch2[ii_x + p_x + 1] + knots_x_patch2[ii_x +
p_x]) / 2;
int i_x = Findspan(m_x_patch2, p_x, knots_x_patch2, Middle_x);
for (int ii_y = 0; ii_y < elements_y_patch2; ii_y++) {
double J_y = (knots_y_patch2[ii_y + p_y + 1] - knots_y_patch2[ii_y + p_y]) / 2;
double Middle_y = (knots_y_patch2[ii_y + p_y + 1] + knots_y_patch2[ii_y +
p_y]) / 2;
int i_y = Findspan(m_y_patch2, p_y, knots_y_patch2, Middle_y);
for (int jj_x = 0; jj_x < gaussian_points; jj_x++) {
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double xi = Middle_x + J_x * gaussian[jj_x];
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_x, **ders_y;
DersBasisFuns(i_x, xi, p_x, knots_x_patch2, 1, ders_x);
DersBasisFuns(i_y, eta, p_y, knots_y_patch2, 1, ders_y);
VectorXd Nxi(p_x + 1), Nxi_xi(p_x + 1), Neta(p_y + 1), Neta_eta(p_y + 1);
for (int kk_x = 0; kk_x < p_x + 1; kk_x++) {
Nxi(kk_x) = ders_x[0][kk_x];
Nxi_xi(kk_x) = ders_x[1][kk_x];
}
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta(kk_y) = ders_y[0][kk_y];
Neta_eta(kk_y) = ders_y[1][kk_y];
}
for (int k = 0; k < 2; k++)
delete ders_x[k];
delete[] ders_x;
for (int k = 0; k < 2; k++)
delete ders_y[k];
delete[] ders_y;
VectorXd Nxi_xiNeta, NxiNeta_eta;
Nxi_xiNeta = kroneckerProduct(Nxi_xi, Neta);
NxiNeta_eta = kroneckerProduct(Nxi, Neta_eta);
double pxpxi, pxpeta, pypxi, pypeta;
Geometry(xi, eta, pxpxi, pxpeta, pypxi, pypeta);
double Jacobian = pxpxi * pypeta - pxpeta * pypxi;
VectorXd Nx_xNy, NxNy_y;
Nx_xNy = 1.0 / Jacobian * (Nxi_xiNeta * pypeta - NxiNeta_eta * pypxi);
NxNy_y = 1.0 / Jacobian * (-Nxi_xiNeta * pxpeta + NxiNeta_eta * pxpxi);
for (int kkx = 0; kkx < (p_x + 1) * (p_y + 1); kkx++) {
for (int kky = 0; kky < (p_x + 1) * (p_y + 1); kky++) {
MatrixXd Bx(3, 2);
MatrixXd By(3, 2);
Bx << Nx_xNy(kkx), 0, 0, NxNy_y(kkx), NxNy_y(kkx), Nx_xNy(kkx);
By << Nx_xNy(kky), 0, 0, NxNy_y(kky), NxNy_y(kky), Nx_xNy(kky);
K_patch2.block(2 * ((m_y_patch2 - p_y) * (kkx / (p_y + 1) + i_x - p_x) + kkx %
(p_y + 1) + i_y - p_y), 2 * ((m_y_patch2 - p_y) * (kky /
(p_y + 1) + i_x - p_x) + kky
% (p_y + 1) + i_y - p_y), 2,
2) += weight[jj_x] * weight[jj_y] * Jacobian * Bx.transpose() * DD * By * J_x *
J_y;
}
}
}
}
}
}
MatrixXd K = MatrixXd::Zero(2 * (dof_patch1 + dof_patch2 + dof_y_patch2),
2 * (dof_patch1 + dof_patch2 + dof_y_patch2));
K.block(0, 0, 2 * dof_patch1, 2 * dof_patch1) = K_patch1;
K.block(2 * dof_patch1, 2 * dof_patch1, 2 * dof_patch2,
2 * dof_patch2) = K_patch2;
K.block(2 * (dof_patch1 - dof_y_patch1), 2 * (dof_patch1 + dof_patch2),
2 * dof_y_patch1, 2 * dof_y_patch2) = Q2;
K.block(2 * (dof_patch1 + dof_patch2), 2 * (dof_patch1 - dof_y_patch1),
2 * dof_y_patch2, 2 * dof_y_patch1) = Q2.transpose();
K.block(2 * (dof_patch1), 2 * (dof_patch1 + dof_patch2),
2 * dof_y_patch2, 2 * dof_y_patch2) = -Q1;
K.block(2 * (dof_patch1 + dof_patch2), 2 * (dof_patch1),
2 * dof_y_patch2, 2 * dof_y_patch2) = -Q1.transpose();
VectorXd FT = VectorXd::Zero(2 * (dof_patch1 + dof_patch2 +
dof_y_patch2));
for (int ii_y = 0; ii_y < elements_y_patch2; ii_y++) {
double J_y = (knots_y_patch2[ii_y + p_y + 1] - knots_y_patch2[ii_y + p_y]) / 2;
double Middle_y = (knots_y_patch2[ii_y + p_y + 1] + knots_y_patch2[ii_y +
p_y]) / 2;
int i_y = Findspan(m_y_patch2, p_y, knots_y_patch2, Middle_y);
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double xi = 0.9999999999999999999999;
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_y;
DersBasisFuns(i_y, eta, p_y, knots_y_patch2, 0, ders_y);
VectorXd Nxi = VectorXd::Zero(dof_x_patch2),
Neta = VectorXd::Zero(dof_y_patch2);
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta(i_y - p_y + kk_y) = ders_y[0][kk_y];
}
Nxi(dof_x_patch2 - 1) = 1;
for (int k = 0; k < 1; k++)
delete ders_y[k];
delete[] ders_y;
VectorXd NxiNetaY, NxiNeta;
VectorXd Y(2);
Y(1) = 1, Y(0) = 0;
NxiNeta = kroneckerProduct(Nxi, Neta);
NxiNetaY = kroneckerProduct(NxiNeta, Y);
double pxpxi, pxpeta, pypxi, pypeta;
Geometry(xi, eta, pxpxi, pxpeta, pypxi, pypeta);
double x, y;
CompToPhy_patch2(xi, eta, x, y);
Vector3d stress;
AnalyticalStress(x, y, L, D, I, P, stress);
FT.segment(2 * (dof_patch1),
2 * (dof_patch2)) += weight[jj_y] * (stress(
2) * NxiNetaY) * J_y * pypeta;
}
}
MatrixXd y_basis = MatrixXd::Zero(dof_y_patch1, dof_y_patch1);
VectorXd Ux_rhs = VectorXd::Zero(dof_y_patch1);
VectorXd Uy_rhs = VectorXd::Zero(dof_y_patch1);
for (int ii_y = 0; ii_y < elements_y_patch1; ii_y++) {
double J_y = (knots_y_patch1[ii_y + p_y + 1] - knots_y_patch1[ii_y + p_y]) / 2;
double Middle_y = (knots_y_patch1[ii_y + p_y + 1] + knots_y_patch1[ii_y +
p_y]) / 2;
int i_y = Findspan(m_y_patch1, p_y, knots_y_patch1, Middle_y);
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double xi = 0;
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_y;
DersBasisFuns(i_y, eta, p_y, knots_y_patch1, 0, ders_y);
VectorXd Neta = VectorXd::Zero(dof_y_patch1);
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta(i_y - p_y + kk_y) = ders_y[0][kk_y];
}
for (int k = 0; k < 1; k++)
delete ders_y[k];
delete[] ders_y;
double pxpxi, pxpeta, pypxi, pypeta;
Geometry(xi, eta, pxpxi, pxpeta, pypxi, pypeta);
double x, y;
CompToPhy_patch1(xi, eta, x, y);
y_basis += weight[jj_y] * Neta * MatrixXd(Neta.transpose()) * J_y * pypeta;
Vector2d deformation;
AnalyticalDeformation(x, y, L, D, I, P, E, nu, deformation);
Ux_rhs += weight[jj_y] * Neta * deformation(0) * J_y * pypeta;
Uy_rhs += weight[jj_y] * Neta * deformation(1) * J_y * pypeta;
}
}
VectorXd Ux_dirichlet = y_basis.ldlt().solve(Ux_rhs);
VectorXd Uy_dirichlet = y_basis.ldlt().solve(Uy_rhs);
VectorXd Dirichlet = VectorXd::Zero(2 * (dof_patch1 + dof_patch2 +
dof_y_patch2));
for (int i = 0; i < dof_y_patch1; i++) {
Dirichlet(2 * i) = Ux_dirichlet(i);
Dirichlet(2 * i + 1) = Uy_dirichlet(i);
}
FT += -K * Dirichlet;
MatrixXd K_compute = K.block(2 * dof_y_patch1, 2 * dof_y_patch1,
2 * (dof_patch1 + dof_patch2 +
dof_y_patch2 - dof_y_patch1), 2 * (dof_patch1 + dof_patch2 +
dof_y_patch2 - dof_y_patch1));
VectorXd F_compute = FT.segment(2 * dof_y_patch1, 2 * (dof_patch1 + dof_patch2 +
dof_y_patch2 - dof_y_patch1));
VectorXd U_result = K_compute.partialPivLu().solve(F_compute);
VectorXd Ux_patch1 = VectorXd::Zero(dof_patch1),
Uy_patch1 = VectorXd::Zero(dof_patch1);
for (int i = 0; i < dof_y_patch1; i++) {
Ux_patch1(i) = Ux_dirichlet(i);
Uy_patch1(i) = Uy_dirichlet(i);
}
for (int i = 0; i < (dof_x_patch1 - 1)*dof_y_patch1; i++) {
Ux_patch1(i + dof_y_patch1) = U_result(2 * i);
Uy_patch1(i + dof_y_patch1) = U_result(2 * i + 1);
}
VectorXd Ux_patch2 = VectorXd::Zero(dof_patch2),
Uy_patch2 = VectorXd::Zero(dof_patch2);
for (int i = 0; i < dof_patch2; i++) {
Ux_patch2(i) = U_result(2 * dof_patch1 - 2 * dof_y_patch1 + 2 *
i);
Uy_patch2(i) = U_result(2 * dof_patch1 - 2 * dof_y_patch1 + 2 * i
+ 1);
}
double L2_norm = 0, L2_norm_error = 0;
for (int ii_x = 0; ii_x < elements_x_patch1; ii_x++) {
double J_x = (knots_x_patch1[ii_x + p_x + 1] - knots_x_patch1[ii_x + p_x]) / 2;
double Middle_x = (knots_x_patch1[ii_x + p_x + 1] + knots_x_patch1[ii_x +
p_x]) / 2;
int i_x = Findspan(m_x_patch1, p_x, knots_x_patch1, Middle_x);
for (int ii_y = 0; ii_y < elements_y_patch1; ii_y++) {
double J_y = (knots_y_patch1[ii_y + p_y + 1] - knots_y_patch1[ii_y + p_y]) / 2;
double Middle_y = (knots_y_patch1[ii_y + p_y + 1] + knots_y_patch1[ii_y +
p_y]) / 2;
int i_y = Findspan(m_y_patch1, p_y, knots_y_patch1, Middle_y);
for (int jj_x = 0; jj_x < gaussian_points; jj_x++) {
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double xi = Middle_x + J_x * gaussian[jj_x];
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_x, **ders_y;
DersBasisFuns(i_x, xi, p_x, knots_x_patch1, 1, ders_x);
DersBasisFuns(i_y, eta, p_y, knots_y_patch1, 1, ders_y);
VectorXd Nxi = VectorXd::Zero(dof_x_patch1),
Nxi_xi = VectorXd::Zero(dof_x_patch1),
Neta = VectorXd::Zero(dof_y_patch1), Neta_eta = VectorXd::Zero(dof_y_patch1);
for (int kk_x = 0; kk_x < p_x + 1; kk_x++) {
Nxi(i_x - p_x + kk_x) = ders_x[0][kk_x];
Nxi_xi(i_x - p_x + kk_x) = ders_x[1][kk_x];
}
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta(i_y - p_y + kk_y) = ders_y[0][kk_y];
Neta_eta(i_y - p_y + kk_y) = ders_y[1][kk_y];
}
for (int k = 0; k < 2; k++)
delete ders_x[k];
delete[] ders_x;
for (int k = 0; k < 2; k++)
delete ders_y[k];
delete[] ders_y;
VectorXd Nxi_xiNeta, NxiNeta_eta, NxiNeta;
NxiNeta = kroneckerProduct(Nxi, Neta);
Nxi_xiNeta = kroneckerProduct(Nxi_xi, Neta);
NxiNeta_eta = kroneckerProduct(Nxi, Neta_eta);
double pxpxi, pxpeta, pypxi, pypeta;
Geometry(xi, eta, pxpxi, pxpeta, pypxi, pypeta);
double Jacobian = pxpxi * pypeta - pxpeta * pypxi;
VectorXd Nx_xNy, NxNy_y;
Nx_xNy = 1.0 / Jacobian * (Nxi_xiNeta * pypeta - NxiNeta_eta * pypxi);
NxNy_y = 1.0 / Jacobian * (-Nxi_xiNeta * pxpeta + NxiNeta_eta * pxpxi);
MatrixXd UX = (NxiNeta.transpose()) * Ux_patch1;
MatrixXd UY = (NxiNeta.transpose()) * Uy_patch1;
double x, y;
CompToPhy_patch1(xi, eta, x, y);
Vector2d deformations;
AnalyticalDeformation(x, y, L, D, I, P, E, nu, deformations);
L2_norm_error += weight[jj_x] * weight[jj_y] * (pow((UX(0,
0) - deformations(0)), 2) + pow((UY(0, 0) - deformations(1)), 2)) * J_x * J_y
* Jacobian;
L2_norm += weight[jj_x] * weight[jj_y] * (pow(deformations(0),
2) + pow(deformations(1), 2)) * J_x * J_y * Jacobian;
}
}
}
}
for (int ii_x = 0; ii_x < elements_x_patch2; ii_x++) {
double J_x = (knots_x_patch2[ii_x + p_x + 1] - knots_x_patch2[ii_x + p_x]) / 2;
double Middle_x = (knots_x_patch2[ii_x + p_x + 1] + knots_x_patch2[ii_x +
p_x]) / 2;
int i_x = Findspan(m_x_patch2, p_x, knots_x_patch2, Middle_x);
for (int ii_y = 0; ii_y < elements_y_patch2; ii_y++) {
double J_y = (knots_y_patch2[ii_y + p_y + 1] - knots_y_patch2[ii_y + p_y]) / 2;
double Middle_y = (knots_y_patch2[ii_y + p_y + 1] + knots_y_patch2[ii_y +
p_y]) / 2;
int i_y = Findspan(m_y_patch2, p_y, knots_y_patch2, Middle_y);
for (int jj_x = 0; jj_x < gaussian_points; jj_x++) {
for (int jj_y = 0; jj_y < gaussian_points; jj_y++) {
double xi = Middle_x + J_x * gaussian[jj_x];
double eta = Middle_y + J_y * gaussian[jj_y];
double** ders_x, **ders_y;
DersBasisFuns(i_x, xi, p_x, knots_x_patch2, 1, ders_x);
DersBasisFuns(i_y, eta, p_y, knots_y_patch2, 1, ders_y);
VectorXd Nxi = VectorXd::Zero(dof_x_patch2),
Nxi_xi = VectorXd::Zero(dof_x_patch2),
Neta = VectorXd::Zero(dof_y_patch2), Neta_eta = VectorXd::Zero(dof_y_patch2);
for (int kk_x = 0; kk_x < p_x + 1; kk_x++) {
Nxi(i_x - p_x + kk_x) = ders_x[0][kk_x];
Nxi_xi(i_x - p_x + kk_x) = ders_x[1][kk_x];
}
for (int kk_y = 0; kk_y < p_y + 1; kk_y++) {
Neta(i_y - p_y + kk_y) = ders_y[0][kk_y];
Neta_eta(i_y - p_y + kk_y) = ders_y[1][kk_y];
}
for (int k = 0; k < 2; k++)
delete ders_x[k];
delete[] ders_x;
for (int k = 0; k < 2; k++)
delete ders_y[k];
delete[] ders_y;
VectorXd Nxi_xiNeta, NxiNeta_eta, NxiNeta;
NxiNeta = kroneckerProduct(Nxi, Neta);
Nxi_xiNeta = kroneckerProduct(Nxi_xi, Neta);
NxiNeta_eta = kroneckerProduct(Nxi, Neta_eta);
double pxpxi, pxpeta, pypxi, pypeta;
Geometry(xi, eta, pxpxi, pxpeta, pypxi, pypeta);
double Jacobian = pxpxi * pypeta - pxpeta * pypxi;
VectorXd Nx_xNy, NxNy_y;
Nx_xNy = 1.0 / Jacobian * (Nxi_xiNeta * pypeta - NxiNeta_eta * pypxi);
NxNy_y = 1.0 / Jacobian * (-Nxi_xiNeta * pxpeta + NxiNeta_eta * pxpxi);
MatrixXd UX = (NxiNeta.transpose()) * Ux_patch2;
MatrixXd UY = (NxiNeta.transpose()) * Uy_patch2;
double x, y;
CompToPhy_patch2(xi, eta, x, y);
Vector2d deformations;
AnalyticalDeformation(x, y, L, D, I, P, E, nu, deformations);
L2_norm_error += weight[jj_x] * weight[jj_y] * (pow((UX(0,
0) - deformations(0)), 2) + pow((UY(0, 0) - deformations(1)), 2)) * J_x * J_y
* Jacobian;
L2_norm += weight[jj_x] * weight[jj_y] * (pow(deformations(0),
2) + pow(deformations(1), 2)) * J_x * J_y * Jacobian;
}
}
}
}
cout << sqrt(L2_norm_error) / sqrt(L2_norm) << endl;
return 0;
}
void GenerateKnot(int order, int refine, int insert, double* insert_knot,
double* & knot, int& m) {
vector<double> Knot;
for (int i = 0; i <= order; i++) {
Knot.push_back(0);
}
for (int i = 0; i < insert; i++) {
Knot.push_back(insert_knot[i]);
}
for (int i = 0; i <= order; i++) {
Knot.push_back(1);
}
for (int i = 0; i < refine; i++) {
for (int j = 0; j < Knot.end() - Knot.begin() - 1; j++) {
double insertion;
if (Knot[j] != Knot[j + 1]) {
insertion = (Knot[j] + Knot[j + 1]) / 2;
Knot.insert(Knot.begin() + j + 1, insertion);
j++;
}
}
}
m = Knot.end() - Knot.begin() - 1;
knot = new double[m + 1];
for (int i = 0; i < m + 1; i++)
knot[i] = Knot[i];
}
void CombineKnot(double* knot1, int m1, double* knot2, int m2, double* & knot,
int& m) {
vector<double> Knot;
int i1 = 0, i2 = 0;
while (i1 <= m1) {
if (knot1[i1] == knot2[i2]) {
Knot.push_back(knot1[i1]);
i1++, i2++;
} else if (knot1[i1] < knot2[i2]) {
Knot.push_back(knot1[i1]);
i1++;
} else {
Knot.push_back(knot2[i2]);
i2++;
}
}
m = Knot.end() - Knot.begin() - 1;
knot = new double[m + 1];
for (int i = 0; i < m + 1; i++)
knot[i] = Knot[i];
}
void AnalyticalDeformation(double x, double y, double L, double D, double I,
double P, double E,
double nu,
Vector2d& deformation) {
double E_bar = E / (1 - pow(nu, 2));
double nu_bar = nu / (1 - nu);
deformation(0) = -P * y / 6 / E_bar / I * ((6 * L - 3 * x) * x +
(2 + nu_bar) * (pow(y,
2) - pow(D / 2, 2)));
deformation(1) = P / 6 / E_bar / I * (3 * nu_bar * pow(y,
2) * (L - x) + (4 + 5 * nu_bar) * D * D * x / 4 + (3 * L - x) * x * x);
}
void AnalyticalStress(double x, double y, double L, double D, double I,
double P,
Vector3d& stress) {
stress(0) = -P * (L - x) * y / I;
stress(1) = 0;
stress(2) = P / 2 / I * (pow(D / 2, 2) - pow(y, 2));
}
void Geometry(double xi, double eta, double& pxpxi, double& pxpeta,
double& pypxi, double& pypeta) {
pxpxi = 2;
pxpeta = 0;
pypxi = 0;
pypeta = 2;
}
void CompToPhy_patch1(double xi, double eta, double& x, double& y) {
y = (eta - 0.5) * 2;
x = xi * 2;
}
void CompToPhy_patch2(double xi, double eta, double& x, double& y) {
y = (eta - 0.5) * 2;
x = (xi + 1.0) * 2;
}