Actual source code: ex45.c

petsc-3.15.0 2021-04-05
Report Typos and Errors
  1: static char help[] = "Heat Equation in 2d and 3d with finite elements.\n\
2: We solve the heat equation in a rectangular\n\
3: domain, using a parallel unstructured mesh (DMPLEX) to discretize it.\n\
4: Contributed by: Julian Andrej <juan@tf.uni-kiel.de>\n\n\n";

6: #include <petscdmplex.h>
7: #include <petscds.h>
8: #include <petscts.h>

10: /*
11:   Heat equation:

13:     du/dt - \Delta u + f = 0
14: */

19: typedef struct {
20:   char         filename[PETSC_MAX_PATH_LEN];   /* Mesh filename */
21:   char         bdfilename[PETSC_MAX_PATH_LEN]; /* Mesh boundary filename */
22:   PetscReal    scale;                          /* Scale factor for mesh */
23:   SolutionType solType;                        /* Type of exact solution */
24: } AppCtx;

26: /*
27: Exact 2D solution:
28:   u = 2t + x^2 + y^2
29:   F(u) = 2 - (2 + 2) + 2 = 0

31: Exact 3D solution:
32:   u = 3t + x^2 + y^2 + z^2
33:   F(u) = 3 - (2 + 2 + 2) + 3 = 0
34: */
35: static PetscErrorCode mms_quad_lin(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, void *ctx)
36: {
37:   PetscInt d;

39:   *u = dim*time;
40:   for (d = 0; d < dim; ++d) *u += x[d]*x[d];
41:   return 0;
42: }

44: static PetscErrorCode mms_quad_lin_t(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, void *ctx)
45: {
46:   *u = dim;
47:   return 0;
48: }

50: static void f0_quad_lin(PetscInt dim, PetscInt Nf, PetscInt NfAux,
51:                         const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[],
52:                         const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[],
53:                         PetscReal t, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar f0[])
54: {
55:   f0[0] = u_t[0] + (PetscScalar) dim;
56: }

58: /*
59: Exact 2D solution:
60:   u = 2*cos(t) + x^2 + y^2
61:   F(u) = -2*sint(t) - (2 + 2) + 2*sin(t) + 4 = 0

63: Exact 3D solution:
64:   u = 3*cos(t) + x^2 + y^2 + z^2
65:   F(u) = -3*sin(t) - (2 + 2 + 2) + 3*sin(t) + 6 = 0
66: */
67: static PetscErrorCode mms_quad_trig(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, void *ctx)
68: {
69:   PetscInt d;

71:   *u = dim*PetscCosReal(time);
72:   for (d = 0; d < dim; ++d) *u += x[d]*x[d];
73:   return 0;
74: }

76: static PetscErrorCode mms_quad_trig_t(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, void *ctx)
77: {
78:   *u = -dim*PetscSinReal(time);
79:   return 0;
80: }

82: static void f0_quad_trig(PetscInt dim, PetscInt Nf, PetscInt NfAux,
83:                          const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[],
84:                          const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[],
85:                          PetscReal t, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar f0[])
86: {
87:   f0[0] = u_t[0] + dim*(PetscSinReal(t) + 2.0);
88: }

90: /*
91: Exact 2D solution:
92:   u = 2\pi^2 t + cos(\pi x) + cos(\pi y)
93:   F(u) = 2\pi^2 - \pi^2 (cos(\pi x) + cos(\pi y)) + \pi^2 (cos(\pi x) + cos(\pi y)) - 2\pi^2 = 0

95: Exact 3D solution:
96:   u = 3\pi^2 t + cos(\pi x) + cos(\pi y) + cos(\pi z)
97:   F(u) = 3\pi^2 - \pi^2 (cos(\pi x) + cos(\pi y) + cos(\pi z)) + \pi^2 (cos(\pi x) + cos(\pi y) + cos(\pi z)) - 3\pi^2 = 0
98: */
99: static PetscErrorCode mms_trig_lin(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, void *ctx)
100: {
101:   PetscInt d;

103:   *u = dim*PetscSqr(PETSC_PI)*time;
104:   for (d = 0; d < dim; ++d) *u += PetscCosReal(PETSC_PI*x[d]);
105:   return 0;
106: }

108: static PetscErrorCode mms_trig_lin_t(PetscInt dim, PetscReal time, const PetscReal x[], PetscInt Nc, PetscScalar *u, void *ctx)
109: {
110:   *u = dim*PetscSqr(PETSC_PI);
111:   return 0;
112: }

114: static void f0_trig_lin(PetscInt dim, PetscInt Nf, PetscInt NfAux,
115:                         const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[],
116:                         const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[],
117:                         PetscReal t, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar f0[])
118: {
119:   PetscInt d;
120:   f0[0] = u_t[0];
121:   for (d = 0; d < dim; ++d) f0[0] += PetscSqr(PETSC_PI)*(PetscCosReal(PETSC_PI*x[d]) - 1.0);
122: }

124: static void f1_temp(PetscInt dim, PetscInt Nf, PetscInt NfAux,
125:                     const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[],
126:                     const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[],
127:                     PetscReal t, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar f1[])
128: {
129:   PetscInt d;
130:   for (d = 0; d < dim; ++d) f1[d] = u_x[d];
131: }

133: static void g3_temp(PetscInt dim, PetscInt Nf, PetscInt NfAux,
134:                     const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[],
135:                     const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[],
136:                     PetscReal t, PetscReal u_tShift, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar g3[])
137: {
138:   PetscInt d;
139:   for (d = 0; d < dim; ++d) g3[d*dim+d] = 1.0;
140: }

142: static void g0_temp(PetscInt dim, PetscInt Nf, PetscInt NfAux,
143:                     const PetscInt uOff[], const PetscInt uOff_x[], const PetscScalar u[], const PetscScalar u_t[], const PetscScalar u_x[],
144:                     const PetscInt aOff[], const PetscInt aOff_x[], const PetscScalar a[], const PetscScalar a_t[], const PetscScalar a_x[],
145:                     PetscReal t, PetscReal u_tShift, const PetscReal x[], PetscInt numConstants, const PetscScalar constants[], PetscScalar g0[])
146: {
147:   g0[0] = u_tShift*1.0;
148: }

150: static PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options)
151: {
152:   PetscInt       sol;

156:   options->filename[0]   = '\0';
157:   options->bdfilename[0] = '\0';
158:   options->scale         = 0.0;

161:   PetscOptionsBegin(comm, "", "Heat Equation Options", "DMPLEX");
162:   PetscOptionsString("-filename", "The mesh file", "ex45.c", options->filename, options->filename, PETSC_MAX_PATH_LEN, NULL);
163:   PetscOptionsString("-bd_filename", "The mesh boundary file", "ex45.c", options->bdfilename, options->bdfilename, PETSC_MAX_PATH_LEN, NULL);
164:   PetscOptionsReal("-scale", "Scale factor for the mesh", "ex45.c", options->scale, &options->scale, NULL);
165:   sol  = options->solType;
166:   PetscOptionsEList("-sol_type", "Type of exact solution", "ex45.c", solutionTypes, NUM_SOLUTION_TYPES, solutionTypes[options->solType], &sol, NULL);
167:   options->solType = (SolutionType) sol;
168:   PetscOptionsEnd();
169:   return(0);
170: }

172: static PetscErrorCode CreateBCLabel(DM dm, const char name[])
173: {
174:   DM             plex;
175:   DMLabel        label;
176:   PetscBool      hasLabel;

180:   DMHasLabel(dm, name, &hasLabel);
181:   if (hasLabel) return(0);
182:   DMCreateLabel(dm, name);
183:   DMGetLabel(dm, name, &label);
184:   DMConvert(dm, DMPLEX, &plex);
185:   DMPlexMarkBoundaryFaces(plex, 1, label);
186:   DMDestroy(&plex);
187:   return(0);
188: }

190: static PetscErrorCode CreateMesh(MPI_Comm comm, DM *dm, AppCtx *ctx)
191: {
192:   size_t         len, lenbd;

196:   PetscStrlen(ctx->filename,   &len);
197:   PetscStrlen(ctx->bdfilename, &lenbd);
198:   if (lenbd) {
199:     DM bdm;

201:     DMPlexCreateFromFile(comm, ctx->bdfilename, PETSC_TRUE, &bdm);
202:     PetscObjectSetOptionsPrefix((PetscObject) bdm, "bd_");
203:     DMSetFromOptions(bdm);
204:     if (ctx->scale != 0.0) {
205:       Vec coordinates, coordinatesLocal;

207:       DMGetCoordinates(bdm, &coordinates);
208:       DMGetCoordinatesLocal(bdm, &coordinatesLocal);
209:       VecScale(coordinates, ctx->scale);
210:       VecScale(coordinatesLocal, ctx->scale);
211:     }
212:     DMViewFromOptions(bdm, NULL, "-dm_view");
213:     DMPlexGenerate(bdm, NULL, PETSC_TRUE, dm);
214:     DMDestroy(&bdm);
215:   } else if (len) {
216:     DMPlexCreateFromFile(comm, ctx->filename, PETSC_TRUE, dm);
217:   } else {
218:     DMPlexCreateBoxMesh(comm, 2, PETSC_TRUE, NULL, NULL, NULL, NULL, PETSC_TRUE, dm);
219:   }
220:   DMSetFromOptions(*dm);
221:   PetscObjectSetName((PetscObject) *dm, "Mesh");
222:   CreateBCLabel(*dm, "marker");
223:   DMViewFromOptions(*dm, NULL, "-dm_view");
224:   return(0);
225: }

227: static PetscErrorCode SetupProblem(DM dm, AppCtx *ctx)
228: {
229:   PetscDS        ds;
230:   const PetscInt id = 1;

234:   DMGetDS(dm, &ds);
235:   PetscDSSetJacobian(ds, 0, 0, g0_temp, NULL, NULL, g3_temp);
236:   switch (ctx->solType) {
241:       DMAddBoundary(dm, DM_BC_ESSENTIAL, "wall", "marker", 0, 0, NULL, (void (*)(void)) mms_quad_lin, (void (*)(void)) mms_quad_lin_t, 1, &id, ctx);
242:       break;
247:       DMAddBoundary(dm, DM_BC_ESSENTIAL, "wall", "marker", 0, 0, NULL, (void (*)(void)) mms_quad_trig, (void (*)(void)) mms_quad_trig_t, 1, &id, ctx);
248:       break;
249:     case SOL_TRIG_LINEAR:
250:       PetscDSSetResidual(ds, 0, f0_trig_lin,  f1_temp);
251:       PetscDSSetExactSolution(ds, 0, mms_trig_lin, ctx);
252:       PetscDSSetExactSolutionTimeDerivative(ds, 0, mms_trig_lin_t, ctx);
253:       DMAddBoundary(dm, DM_BC_ESSENTIAL, "wall", "marker", 0, 0, NULL, (void (*)(void)) mms_trig_lin, (void (*)(void)) mms_trig_lin_t, 1, &id, ctx);
254:       break;
255:     default: SETERRQ2(PetscObjectComm((PetscObject) dm), PETSC_ERR_ARG_WRONG, "Invalid solution type: %s (%D)", solutionTypes[PetscMin(ctx->solType, NUM_SOLUTION_TYPES)], ctx->solType);
256:   }
257:   return(0);
258: }

260: static PetscErrorCode SetupDiscretization(DM dm, AppCtx* ctx)
261: {
262:   DM             cdm = dm;
263:   PetscFE        fe;
264:   DMPolytopeType ct;
265:   PetscBool      simplex;
266:   PetscInt       dim, cStart;

270:   DMGetDimension(dm, &dim);
271:   DMPlexGetHeightStratum(dm, 0, &cStart, NULL);
272:   DMPlexGetCellType(dm, cStart, &ct);
273:   simplex = DMPolytopeTypeGetNumVertices(ct) == DMPolytopeTypeGetDim(ct)+1 ? PETSC_TRUE : PETSC_FALSE;
274:   /* Create finite element */
275:   PetscFECreateDefault(PETSC_COMM_SELF, dim, 1, simplex, "temp_", -1, &fe);
276:   PetscObjectSetName((PetscObject) fe, "temperature");
277:   /* Set discretization and boundary conditions for each mesh */
278:   DMSetField(dm, 0, NULL, (PetscObject) fe);
279:   DMCreateDS(dm);
280:   SetupProblem(dm, ctx);
281:   while (cdm) {
282:     CreateBCLabel(cdm, "marker");
283:     DMCopyDisc(dm, cdm);
284:     DMGetCoarseDM(cdm, &cdm);
285:   }
286:   PetscFEDestroy(&fe);
287:   return(0);
288: }

290: static PetscErrorCode SetInitialConditions(TS ts, Vec u)
291: {
292:   DM             dm;
293:   PetscReal      t;

297:   TSGetDM(ts, &dm);
298:   TSGetTime(ts, &t);
299:   DMComputeExactSolution(dm, t, u, NULL);
300:   return(0);
301: }

303: int main(int argc, char **argv)
304: {
305:   DM             dm;
306:   TS             ts;
307:   Vec            u;
308:   AppCtx         ctx;

311:   PetscInitialize(&argc, &argv, NULL, help);if (ierr) return ierr;
312:   ProcessOptions(PETSC_COMM_WORLD, &ctx);
313:   CreateMesh(PETSC_COMM_WORLD, &dm, &ctx);
314:   DMSetApplicationContext(dm, &ctx);
315:   SetupDiscretization(dm, &ctx);

317:   TSCreate(PETSC_COMM_WORLD, &ts);
318:   TSSetDM(ts, dm);
319:   DMTSSetBoundaryLocal(dm, DMPlexTSComputeBoundary, &ctx);
320:   DMTSSetIFunctionLocal(dm, DMPlexTSComputeIFunctionFEM, &ctx);
321:   DMTSSetIJacobianLocal(dm, DMPlexTSComputeIJacobianFEM, &ctx);
322:   TSSetExactFinalTime(ts, TS_EXACTFINALTIME_MATCHSTEP);
323:   TSSetFromOptions(ts);
324:   TSSetComputeInitialCondition(ts, SetInitialConditions);

326:   DMCreateGlobalVector(dm, &u);
327:   DMTSCheckFromOptions(ts, u);
328:   SetInitialConditions(ts, u);
329:   PetscObjectSetName((PetscObject) u, "temperature");
330:   TSSolve(ts, u);
331:   DMTSCheckFromOptions(ts, u);

333:   VecDestroy(&u);
334:   TSDestroy(&ts);
335:   DMDestroy(&dm);
336:   PetscFinalize();
337:   return ierr;
338: }

340: /*TEST

342:   test:
343:     suffix: 2d_p1
344:     requires: triangle
345:     args: -sol_type quadratic_linear -dm_refine 1 -temp_petscspace_degree 1 -dmts_check .0001 \
346:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
347:   test:
348:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [1.9]
349:     suffix: 2d_p1_sconv
350:     requires: triangle
351:     args: -sol_type quadratic_linear -temp_petscspace_degree 1 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
352:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00001 -snes_error_if_not_converged -pc_type lu
353:   test:
354:     # -dm_refine 4 -convest_num_refine 3 get L_2 convergence rate: [1.2]
355:     suffix: 2d_p1_tconv
356:     requires: triangle
357:     args: -sol_type quadratic_trig -temp_petscspace_degree 1 -ts_convergence_estimate -convest_num_refine 1 \
358:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
359:   test:
360:     suffix: 2d_p2
361:     requires: triangle
362:     args: -sol_type quadratic_linear -dm_refine 0 -temp_petscspace_degree 2 -dmts_check .0001 \
363:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
364:   test:
365:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [2.9]
366:     suffix: 2d_p2_sconv
367:     requires: triangle
368:     args: -sol_type trig_linear -temp_petscspace_degree 2 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
369:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00000001 -snes_error_if_not_converged -pc_type lu
370:   test:
371:     # -dm_refine 3 -convest_num_refine 3 get L_2 convergence rate: [1.0]
372:     suffix: 2d_p2_tconv
373:     requires: triangle
374:     args: -sol_type quadratic_trig -temp_petscspace_degree 2 -ts_convergence_estimate -convest_num_refine 1 \
375:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
376:   test:
377:     suffix: 2d_q1
378:     args: -sol_type quadratic_linear -dm_plex_box_simplex 0 -dm_refine 1 -temp_petscspace_degree 1 -dmts_check .0001 \
379:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
380:   test:
381:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [1.9]
382:     suffix: 2d_q1_sconv
383:     args: -sol_type quadratic_linear -dm_plex_box_simplex 0 -temp_petscspace_degree 1 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
384:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00001 -snes_error_if_not_converged -pc_type lu
385:   test:
386:     # -dm_refine 4 -convest_num_refine 3 get L_2 convergence rate: [1.2]
387:     suffix: 2d_q1_tconv
388:     args: -sol_type quadratic_trig -dm_plex_box_simplex 0 -temp_petscspace_degree 1 -ts_convergence_estimate -convest_num_refine 1 \
389:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
390:   test:
391:     suffix: 2d_q2
392:     args: -sol_type quadratic_linear -dm_plex_box_simplex 0 -dm_refine 0 -temp_petscspace_degree 2 -dmts_check .0001 \
393:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
394:   test:
395:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [2.9]
396:     suffix: 2d_q2_sconv
397:     args: -sol_type trig_linear -dm_plex_box_simplex 0 -temp_petscspace_degree 2 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
398:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00000001 -snes_error_if_not_converged -pc_type lu
399:   test:
400:     # -dm_refine 3 -convest_num_refine 3 get L_2 convergence rate: [1.0]
401:     suffix: 2d_q2_tconv
402:     args: -sol_type quadratic_trig -dm_plex_box_simplex 0 -temp_petscspace_degree 2 -ts_convergence_estimate -convest_num_refine 1 \
403:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu

405:   test:
406:     suffix: 3d_p1
407:     requires: ctetgen
408:     args: -sol_type quadratic_linear -dm_refine 1 -temp_petscspace_degree 1 -dmts_check .0001 \
409:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
410:   test:
411:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [1.9]
412:     suffix: 3d_p1_sconv
413:     requires: ctetgen
414:     args: -sol_type quadratic_linear -temp_petscspace_degree 1 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
415:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00001 -snes_error_if_not_converged -pc_type lu
416:   test:
417:     # -dm_refine 4 -convest_num_refine 3 get L_2 convergence rate: [1.2]
418:     suffix: 3d_p1_tconv
419:     requires: ctetgen
420:     args: -sol_type quadratic_trig -temp_petscspace_degree 1 -ts_convergence_estimate -convest_num_refine 1 \
421:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
422:   test:
423:     suffix: 3d_p2
424:     requires: ctetgen
425:     args: -sol_type quadratic_linear -dm_refine 0 -temp_petscspace_degree 2 -dmts_check .0001 \
426:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
427:   test:
428:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [2.9]
429:     suffix: 3d_p2_sconv
430:     requires: ctetgen
431:     args: -sol_type trig_linear -temp_petscspace_degree 2 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
432:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00000001 -snes_error_if_not_converged -pc_type lu
433:   test:
434:     # -dm_refine 3 -convest_num_refine 3 get L_2 convergence rate: [1.0]
435:     suffix: 3d_p2_tconv
436:     requires: ctetgen
437:     args: -sol_type quadratic_trig -temp_petscspace_degree 2 -ts_convergence_estimate -convest_num_refine 1 \
438:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
439:   test:
440:     suffix: 3d_q1
441:     args: -sol_type quadratic_linear -dm_plex_box_simplex 0 -dm_refine 1 -temp_petscspace_degree 1 -dmts_check .0001 \
442:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
443:   test:
444:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [1.9]
445:     suffix: 3d_q1_sconv
446:     args: -sol_type quadratic_linear -dm_plex_box_simplex 0 -temp_petscspace_degree 1 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
447:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00001 -snes_error_if_not_converged -pc_type lu
448:   test:
449:     # -dm_refine 4 -convest_num_refine 3 get L_2 convergence rate: [1.2]
450:     suffix: 3d_q1_tconv
451:     args: -sol_type quadratic_trig -dm_plex_box_simplex 0 -temp_petscspace_degree 1 -ts_convergence_estimate -convest_num_refine 1 \
452:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
453:   test:
454:     suffix: 3d_q2
455:     args: -sol_type quadratic_linear -dm_plex_box_simplex 0 -dm_refine 0 -temp_petscspace_degree 2 -dmts_check .0001 \
456:           -ts_type beuler -ts_max_steps 5 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu
457:   test:
458:     # -dm_refine 2 -convest_num_refine 3 get L_2 convergence rate: [2.9]
459:     suffix: 3d_q2_sconv
460:     args: -sol_type trig_linear -dm_plex_box_simplex 0 -temp_petscspace_degree 2 -ts_convergence_estimate -ts_convergence_temporal 0 -convest_num_refine 1 \
461:           -ts_type beuler -ts_max_steps 1 -ts_dt 0.00000001 -snes_error_if_not_converged -pc_type lu
462:   test:
463:     # -dm_refine 3 -convest_num_refine 3 get L_2 convergence rate: [1.0]
464:     suffix: 3d_q2_tconv
465:     args: -sol_type quadratic_trig -dm_plex_box_simplex 0 -temp_petscspace_degree 2 -ts_convergence_estimate -convest_num_refine 1 \
466:           -ts_type beuler -ts_max_steps 4 -ts_dt 0.1 -snes_error_if_not_converged -pc_type lu

468:   test:
469:     # For a nice picture, -bd_dm_refine 2 -dm_refine 1 -dm_view hdf5:${PETSC_DIR}/sol.h5 -ts_monitor_solution hdf5:${PETSC_DIR}/sol.h5::append