1 // Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and other CEED contributors. 2 // All Rights Reserved. See the top-level LICENSE and NOTICE files for details. 3 // 4 // SPDX-License-Identifier: BSD-2-Clause 5 // 6 // This file is part of CEED: http://github.com/ceed 7 8 /// @file 9 /// Time-stepping functions for Navier-Stokes example using PETSc 10 11 #include "../navierstokes.h" 12 13 // Compute mass matrix for explicit scheme 14 PetscErrorCode ComputeLumpedMassMatrix(Ceed ceed, DM dm, CeedData ceed_data, Vec M) { 15 Vec M_loc; 16 CeedQFunction qf_mass; 17 CeedOperator op_mass; 18 CeedVector m_ceed, ones_vec; 19 CeedInt num_comp_q, q_data_size; 20 PetscFunctionBeginUser; 21 22 // CEED Restriction 23 CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_q, &num_comp_q); 24 CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_qd_i, &q_data_size); 25 CeedElemRestrictionCreateVector(ceed_data->elem_restr_q, &m_ceed, NULL); 26 CeedElemRestrictionCreateVector(ceed_data->elem_restr_q, &ones_vec, NULL); 27 CeedVectorSetValue(ones_vec, 1.0); 28 29 // CEED QFunction 30 PetscCall(CreateMassQFunction(ceed, num_comp_q, q_data_size, &qf_mass)); 31 32 // CEED Operator 33 CeedOperatorCreate(ceed, qf_mass, NULL, NULL, &op_mass); 34 CeedOperatorSetField(op_mass, "u", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE); 35 CeedOperatorSetField(op_mass, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_COLLOCATED, ceed_data->q_data); 36 CeedOperatorSetField(op_mass, "v", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE); 37 38 // Place PETSc vector in CEED vector 39 CeedScalar *m; 40 PetscMemType m_mem_type; 41 PetscCall(DMGetLocalVector(dm, &M_loc)); 42 PetscCall(VecGetArrayAndMemType(M_loc, (PetscScalar **)&m, &m_mem_type)); 43 CeedVectorSetArray(m_ceed, MemTypeP2C(m_mem_type), CEED_USE_POINTER, m); 44 45 // Apply CEED Operator 46 CeedOperatorApply(op_mass, ones_vec, m_ceed, CEED_REQUEST_IMMEDIATE); 47 48 // Restore vectors 49 CeedVectorTakeArray(m_ceed, MemTypeP2C(m_mem_type), NULL); 50 PetscCall(VecRestoreArrayReadAndMemType(M_loc, (const PetscScalar **)&m)); 51 52 // Local-to-Global 53 PetscCall(VecZeroEntries(M)); 54 PetscCall(DMLocalToGlobal(dm, M_loc, ADD_VALUES, M)); 55 PetscCall(DMRestoreLocalVector(dm, &M_loc)); 56 57 // Invert diagonally lumped mass vector for RHS function 58 PetscCall(VecReciprocal(M)); 59 60 // Cleanup 61 CeedVectorDestroy(&ones_vec); 62 CeedVectorDestroy(&m_ceed); 63 CeedQFunctionDestroy(&qf_mass); 64 CeedOperatorDestroy(&op_mass); 65 66 PetscFunctionReturn(0); 67 } 68 69 // RHS (Explicit time-stepper) function setup 70 // This is the RHS of the ODE, given as u_t = G(t,u) 71 // This function takes in a state vector Q and writes into G 72 PetscErrorCode RHS_NS(TS ts, PetscReal t, Vec Q, Vec G, void *user_data) { 73 User user = *(User *)user_data; 74 PetscScalar *q, *g; 75 Vec Q_loc = user->Q_loc, G_loc; 76 PetscMemType q_mem_type, g_mem_type; 77 PetscFunctionBeginUser; 78 79 // Get local vector 80 PetscCall(DMGetLocalVector(user->dm, &G_loc)); 81 82 // Update time dependent data 83 if (user->time != t) { 84 PetscCall(DMPlexInsertBoundaryValues(user->dm, PETSC_TRUE, Q_loc, t, NULL, NULL, NULL)); 85 if (user->phys->solution_time_label) { 86 CeedOperatorContextSetDouble(user->op_rhs, user->phys->solution_time_label, &t); 87 } 88 user->time = t; 89 } 90 if (user->phys->timestep_size_label) { 91 PetscScalar dt; 92 PetscCall(TSGetTimeStep(ts, &dt)); 93 if (user->dt != dt) { 94 CeedOperatorContextSetDouble(user->op_rhs, user->phys->timestep_size_label, &dt); 95 user->dt = dt; 96 } 97 } 98 99 // Global-to-local 100 PetscCall(DMGlobalToLocal(user->dm, Q, INSERT_VALUES, Q_loc)); 101 102 // Place PETSc vectors in CEED vectors 103 PetscCall(VecGetArrayReadAndMemType(Q_loc, (const PetscScalar **)&q, &q_mem_type)); 104 PetscCall(VecGetArrayAndMemType(G_loc, &g, &g_mem_type)); 105 CeedVectorSetArray(user->q_ceed, MemTypeP2C(q_mem_type), CEED_USE_POINTER, q); 106 CeedVectorSetArray(user->g_ceed, MemTypeP2C(g_mem_type), CEED_USE_POINTER, g); 107 108 // Apply CEED operator 109 CeedOperatorApply(user->op_rhs, user->q_ceed, user->g_ceed, CEED_REQUEST_IMMEDIATE); 110 111 // Restore vectors 112 CeedVectorTakeArray(user->q_ceed, MemTypeP2C(q_mem_type), NULL); 113 CeedVectorTakeArray(user->g_ceed, MemTypeP2C(g_mem_type), NULL); 114 PetscCall(VecRestoreArrayReadAndMemType(Q_loc, (const PetscScalar **)&q)); 115 PetscCall(VecRestoreArrayAndMemType(G_loc, &g)); 116 117 // Local-to-Global 118 PetscCall(VecZeroEntries(G)); 119 PetscCall(DMLocalToGlobal(user->dm, G_loc, ADD_VALUES, G)); 120 121 // Inverse of the lumped mass matrix (M is Minv) 122 PetscCall(VecPointwiseMult(G, G, user->M)); 123 124 // Restore vectors 125 PetscCall(DMRestoreLocalVector(user->dm, &G_loc)); 126 127 PetscFunctionReturn(0); 128 } 129 130 // Implicit time-stepper function setup 131 PetscErrorCode IFunction_NS(TS ts, PetscReal t, Vec Q, Vec Q_dot, Vec G, void *user_data) { 132 User user = *(User *)user_data; 133 const PetscScalar *q, *q_dot; 134 PetscScalar *g; 135 Vec Q_loc = user->Q_loc, Q_dot_loc = user->Q_dot_loc, G_loc; 136 PetscMemType q_mem_type, q_dot_mem_type, g_mem_type; 137 PetscFunctionBeginUser; 138 139 // Get local vectors 140 PetscCall(DMGetLocalVector(user->dm, &G_loc)); 141 142 // Update time dependent data 143 if (user->time != t) { 144 PetscCall(DMPlexInsertBoundaryValues(user->dm, PETSC_TRUE, Q_loc, t, NULL, NULL, NULL)); 145 if (user->phys->solution_time_label) { 146 CeedOperatorContextSetDouble(user->op_ifunction, user->phys->solution_time_label, &t); 147 } 148 user->time = t; 149 } 150 if (user->phys->timestep_size_label) { 151 PetscScalar dt; 152 PetscCall(TSGetTimeStep(ts, &dt)); 153 if (user->dt != dt) { 154 CeedOperatorContextSetDouble(user->op_ifunction, user->phys->timestep_size_label, &dt); 155 user->dt = dt; 156 } 157 } 158 159 // Global-to-local 160 PetscCall(DMGlobalToLocal(user->dm, Q, INSERT_VALUES, Q_loc)); 161 PetscCall(DMGlobalToLocal(user->dm, Q_dot, INSERT_VALUES, Q_dot_loc)); 162 163 // Place PETSc vectors in CEED vectors 164 PetscCall(VecGetArrayReadAndMemType(Q_loc, &q, &q_mem_type)); 165 PetscCall(VecGetArrayReadAndMemType(Q_dot_loc, &q_dot, &q_dot_mem_type)); 166 PetscCall(VecGetArrayAndMemType(G_loc, &g, &g_mem_type)); 167 CeedVectorSetArray(user->q_ceed, MemTypeP2C(q_mem_type), CEED_USE_POINTER, (PetscScalar *)q); 168 CeedVectorSetArray(user->q_dot_ceed, MemTypeP2C(q_dot_mem_type), CEED_USE_POINTER, (PetscScalar *)q_dot); 169 CeedVectorSetArray(user->g_ceed, MemTypeP2C(g_mem_type), CEED_USE_POINTER, g); 170 171 // Apply CEED operator 172 CeedOperatorApply(user->op_ifunction, user->q_ceed, user->g_ceed, CEED_REQUEST_IMMEDIATE); 173 174 // Restore vectors 175 CeedVectorTakeArray(user->q_ceed, MemTypeP2C(q_mem_type), NULL); 176 CeedVectorTakeArray(user->q_dot_ceed, MemTypeP2C(q_dot_mem_type), NULL); 177 CeedVectorTakeArray(user->g_ceed, MemTypeP2C(g_mem_type), NULL); 178 PetscCall(VecRestoreArrayReadAndMemType(Q_loc, &q)); 179 PetscCall(VecRestoreArrayReadAndMemType(Q_dot_loc, &q_dot)); 180 PetscCall(VecRestoreArrayAndMemType(G_loc, &g)); 181 182 // Local-to-Global 183 PetscCall(VecZeroEntries(G)); 184 PetscCall(DMLocalToGlobal(user->dm, G_loc, ADD_VALUES, G)); 185 186 // Restore vectors 187 PetscCall(DMRestoreLocalVector(user->dm, &G_loc)); 188 189 PetscFunctionReturn(0); 190 } 191 192 static PetscErrorCode MatMult_NS_IJacobian(Mat J, Vec Q, Vec G) { 193 User user; 194 const PetscScalar *q; 195 PetscScalar *g; 196 PetscMemType q_mem_type, g_mem_type; 197 PetscFunctionBeginUser; 198 PetscCall(MatShellGetContext(J, &user)); 199 Vec Q_loc = user->Q_dot_loc, // Note - Q_dot_loc has zero BCs 200 G_loc; 201 202 // Get local vectors 203 PetscCall(DMGetLocalVector(user->dm, &G_loc)); 204 205 // Global-to-local 206 PetscCall(DMGlobalToLocal(user->dm, Q, INSERT_VALUES, Q_loc)); 207 208 // Place PETSc vectors in CEED vectors 209 PetscCall(VecGetArrayReadAndMemType(Q_loc, &q, &q_mem_type)); 210 PetscCall(VecGetArrayAndMemType(G_loc, &g, &g_mem_type)); 211 CeedVectorSetArray(user->q_ceed, MemTypeP2C(q_mem_type), CEED_USE_POINTER, (PetscScalar *)q); 212 CeedVectorSetArray(user->g_ceed, MemTypeP2C(g_mem_type), CEED_USE_POINTER, g); 213 214 // Apply CEED operator 215 CeedOperatorApply(user->op_ijacobian, user->q_ceed, user->g_ceed, CEED_REQUEST_IMMEDIATE); 216 217 // Restore vectors 218 CeedVectorTakeArray(user->q_ceed, MemTypeP2C(q_mem_type), NULL); 219 CeedVectorTakeArray(user->g_ceed, MemTypeP2C(g_mem_type), NULL); 220 PetscCall(VecRestoreArrayReadAndMemType(Q_loc, &q)); 221 PetscCall(VecRestoreArrayAndMemType(G_loc, &g)); 222 223 // Local-to-Global 224 PetscCall(VecZeroEntries(G)); 225 PetscCall(DMLocalToGlobal(user->dm, G_loc, ADD_VALUES, G)); 226 227 // Restore vectors 228 PetscCall(DMRestoreLocalVector(user->dm, &G_loc)); 229 PetscFunctionReturn(0); 230 } 231 232 PetscErrorCode MatGetDiagonal_NS_IJacobian(Mat A, Vec D) { 233 User user; 234 Vec D_loc; 235 PetscScalar *d; 236 PetscMemType mem_type; 237 238 PetscFunctionBeginUser; 239 MatShellGetContext(A, &user); 240 PetscCall(DMGetLocalVector(user->dm, &D_loc)); 241 PetscCall(VecGetArrayAndMemType(D_loc, &d, &mem_type)); 242 CeedVectorSetArray(user->g_ceed, MemTypeP2C(mem_type), CEED_USE_POINTER, d); 243 CeedOperatorLinearAssembleDiagonal(user->op_ijacobian, user->g_ceed, CEED_REQUEST_IMMEDIATE); 244 CeedVectorTakeArray(user->g_ceed, MemTypeP2C(mem_type), NULL); 245 PetscCall(VecRestoreArrayAndMemType(D_loc, &d)); 246 PetscCall(VecZeroEntries(D)); 247 PetscCall(DMLocalToGlobal(user->dm, D_loc, ADD_VALUES, D)); 248 PetscCall(DMRestoreLocalVector(user->dm, &D_loc)); 249 VecViewFromOptions(D, NULL, "-diag_vec_view"); 250 PetscFunctionReturn(0); 251 } 252 253 static PetscErrorCode FormPreallocation(User user, PetscBool pbdiagonal, Mat J, CeedVector *coo_values) { 254 PetscCount ncoo; 255 PetscInt *rows, *cols; 256 257 PetscFunctionBeginUser; 258 if (pbdiagonal) { 259 CeedSize l_size; 260 CeedOperatorGetActiveVectorLengths(user->op_ijacobian, &l_size, NULL); 261 ncoo = l_size * 5; 262 rows = malloc(ncoo * sizeof(rows[0])); 263 cols = malloc(ncoo * sizeof(cols[0])); 264 for (PetscCount n = 0; n < l_size / 5; n++) { 265 for (PetscInt i = 0; i < 5; i++) { 266 for (PetscInt j = 0; j < 5; j++) { 267 rows[(n * 5 + i) * 5 + j] = n * 5 + i; 268 cols[(n * 5 + i) * 5 + j] = n * 5 + j; 269 } 270 } 271 } 272 } else { 273 PetscCall(CeedOperatorLinearAssembleSymbolic(user->op_ijacobian, &ncoo, &rows, &cols)); 274 } 275 PetscCall(MatSetPreallocationCOOLocal(J, ncoo, rows, cols)); 276 free(rows); 277 free(cols); 278 CeedVectorCreate(user->ceed, ncoo, coo_values); 279 PetscFunctionReturn(0); 280 } 281 282 static PetscErrorCode FormSetValues(User user, PetscBool pbdiagonal, Mat J, CeedVector coo_values) { 283 CeedMemType mem_type = CEED_MEM_HOST; 284 const PetscScalar *values; 285 MatType mat_type; 286 287 PetscFunctionBeginUser; 288 PetscCall(MatGetType(J, &mat_type)); 289 if (strstr(mat_type, "kokkos") || strstr(mat_type, "cusparse")) mem_type = CEED_MEM_DEVICE; 290 if (user->app_ctx->pmat_pbdiagonal) { 291 CeedOperatorLinearAssemblePointBlockDiagonal(user->op_ijacobian, coo_values, CEED_REQUEST_IMMEDIATE); 292 } else { 293 CeedOperatorLinearAssemble(user->op_ijacobian, coo_values); 294 } 295 CeedVectorGetArrayRead(coo_values, mem_type, &values); 296 PetscCall(MatSetValuesCOO(J, values, INSERT_VALUES)); 297 CeedVectorRestoreArrayRead(coo_values, &values); 298 PetscFunctionReturn(0); 299 } 300 301 PetscErrorCode FormIJacobian_NS(TS ts, PetscReal t, Vec Q, Vec Q_dot, PetscReal shift, Mat J, Mat J_pre, void *user_data) { 302 User user = *(User *)user_data; 303 PetscBool J_is_shell, J_is_mffd, J_pre_is_shell; 304 PetscFunctionBeginUser; 305 if (user->phys->ijacobian_time_shift_label) CeedOperatorContextSetDouble(user->op_ijacobian, user->phys->ijacobian_time_shift_label, &shift); 306 PetscCall(PetscObjectTypeCompare((PetscObject)J, MATMFFD, &J_is_mffd)); 307 PetscCall(PetscObjectTypeCompare((PetscObject)J, MATSHELL, &J_is_shell)); 308 PetscCall(PetscObjectTypeCompare((PetscObject)J_pre, MATSHELL, &J_pre_is_shell)); 309 if (!user->matrices_set_up) { 310 if (J_is_shell) { 311 PetscCall(MatShellSetContext(J, user)); 312 PetscCall(MatShellSetOperation(J, MATOP_MULT, (void (*)(void))MatMult_NS_IJacobian)); 313 PetscCall(MatShellSetOperation(J, MATOP_GET_DIAGONAL, (void (*)(void))MatGetDiagonal_NS_IJacobian)); 314 PetscCall(MatSetUp(J)); 315 } 316 if (!J_pre_is_shell) { 317 PetscCall(FormPreallocation(user, user->app_ctx->pmat_pbdiagonal, J_pre, &user->coo_values_pmat)); 318 } 319 if (J != J_pre && !J_is_shell && !J_is_mffd) { 320 PetscCall(FormPreallocation(user, PETSC_FALSE, J, &user->coo_values_amat)); 321 } 322 user->matrices_set_up = true; 323 } 324 if (!J_pre_is_shell) { 325 PetscCall(FormSetValues(user, user->app_ctx->pmat_pbdiagonal, J_pre, user->coo_values_pmat)); 326 } 327 if (user->coo_values_amat) { 328 PetscCall(FormSetValues(user, PETSC_FALSE, J, user->coo_values_amat)); 329 } else if (J_is_mffd) { 330 PetscCall(MatAssemblyBegin(J, MAT_FINAL_ASSEMBLY)); 331 PetscCall(MatAssemblyEnd(J, MAT_FINAL_ASSEMBLY)); 332 } 333 PetscFunctionReturn(0); 334 } 335 336 PetscErrorCode WriteOutput(User user, Vec Q, PetscInt step_no, PetscScalar time) { 337 Vec Q_loc; 338 char file_path[PETSC_MAX_PATH_LEN]; 339 PetscViewer viewer; 340 PetscFunctionBeginUser; 341 342 if (user->app_ctx->checkpoint_vtk) { 343 // Set up output 344 PetscCall(DMGetLocalVector(user->dm, &Q_loc)); 345 PetscCall(PetscObjectSetName((PetscObject)Q_loc, "StateVec")); 346 PetscCall(VecZeroEntries(Q_loc)); 347 PetscCall(DMGlobalToLocal(user->dm, Q, INSERT_VALUES, Q_loc)); 348 349 // Output 350 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-%03" PetscInt_FMT ".vtu", user->app_ctx->output_dir, step_no)); 351 352 PetscCall(PetscViewerVTKOpen(PetscObjectComm((PetscObject)Q), file_path, FILE_MODE_WRITE, &viewer)); 353 PetscCall(VecView(Q_loc, viewer)); 354 PetscCall(PetscViewerDestroy(&viewer)); 355 if (user->dm_viz) { 356 Vec Q_refined, Q_refined_loc; 357 char file_path_refined[PETSC_MAX_PATH_LEN]; 358 PetscViewer viewer_refined; 359 360 PetscCall(DMGetGlobalVector(user->dm_viz, &Q_refined)); 361 PetscCall(DMGetLocalVector(user->dm_viz, &Q_refined_loc)); 362 PetscCall(PetscObjectSetName((PetscObject)Q_refined_loc, "Refined")); 363 364 PetscCall(MatInterpolate(user->interp_viz, Q, Q_refined)); 365 PetscCall(VecZeroEntries(Q_refined_loc)); 366 PetscCall(DMGlobalToLocal(user->dm_viz, Q_refined, INSERT_VALUES, Q_refined_loc)); 367 368 PetscCall( 369 PetscSNPrintf(file_path_refined, sizeof file_path_refined, "%s/nsrefined-%03" PetscInt_FMT ".vtu", user->app_ctx->output_dir, step_no)); 370 371 PetscCall(PetscViewerVTKOpen(PetscObjectComm((PetscObject)Q_refined), file_path_refined, FILE_MODE_WRITE, &viewer_refined)); 372 PetscCall(VecView(Q_refined_loc, viewer_refined)); 373 PetscCall(DMRestoreLocalVector(user->dm_viz, &Q_refined_loc)); 374 PetscCall(DMRestoreGlobalVector(user->dm_viz, &Q_refined)); 375 PetscCall(PetscViewerDestroy(&viewer_refined)); 376 } 377 PetscCall(DMRestoreLocalVector(user->dm, &Q_loc)); 378 } 379 380 // Save data in a binary file for continuation of simulations 381 if (user->app_ctx->add_stepnum2bin) { 382 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-solution-%" PetscInt_FMT ".bin", user->app_ctx->output_dir, step_no)); 383 } else { 384 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-solution.bin", user->app_ctx->output_dir)); 385 } 386 PetscCall(PetscViewerBinaryOpen(user->comm, file_path, FILE_MODE_WRITE, &viewer)); 387 388 PetscInt token = FLUIDS_FILE_TOKEN; 389 PetscCall(PetscViewerBinaryWrite(viewer, &token, 1, PETSC_INT)); 390 PetscCall(PetscViewerBinaryWrite(viewer, &step_no, 1, PETSC_INT)); 391 time /= user->units->second; // Dimensionalize time back 392 PetscCall(PetscViewerBinaryWrite(viewer, &time, 1, PETSC_REAL)); 393 PetscCall(VecView(Q, viewer)); 394 PetscCall(PetscViewerDestroy(&viewer)); 395 PetscFunctionReturn(0); 396 } 397 398 // User provided TS Monitor 399 PetscErrorCode TSMonitor_NS(TS ts, PetscInt step_no, PetscReal time, Vec Q, void *ctx) { 400 User user = ctx; 401 PetscFunctionBeginUser; 402 403 // Print every 'checkpoint_interval' steps 404 if (user->app_ctx->checkpoint_interval <= 0 || step_no % user->app_ctx->checkpoint_interval != 0 || 405 (user->app_ctx->cont_steps == step_no && step_no != 0)) 406 PetscFunctionReturn(0); 407 408 PetscCall(WriteOutput(user, Q, step_no, time)); 409 410 PetscFunctionReturn(0); 411 } 412 413 // TS: Create, setup, and solve 414 PetscErrorCode TSSolve_NS(DM dm, User user, AppCtx app_ctx, Physics phys, Vec *Q, PetscScalar *f_time, TS *ts) { 415 MPI_Comm comm = user->comm; 416 TSAdapt adapt; 417 PetscScalar final_time; 418 PetscFunctionBeginUser; 419 420 PetscCall(TSCreate(comm, ts)); 421 PetscCall(TSSetDM(*ts, dm)); 422 if (phys->implicit) { 423 PetscCall(TSSetType(*ts, TSBDF)); 424 if (user->op_ifunction) { 425 PetscCall(TSSetIFunction(*ts, NULL, IFunction_NS, &user)); 426 } else { // Implicit integrators can fall back to using an RHSFunction 427 PetscCall(TSSetRHSFunction(*ts, NULL, RHS_NS, &user)); 428 } 429 if (user->op_ijacobian) { 430 PetscCall(DMTSSetIJacobian(dm, FormIJacobian_NS, &user)); 431 if (app_ctx->amat_type) { 432 Mat Pmat, Amat; 433 PetscCall(DMCreateMatrix(dm, &Pmat)); 434 PetscCall(DMSetMatType(dm, app_ctx->amat_type)); 435 PetscCall(DMCreateMatrix(dm, &Amat)); 436 PetscCall(TSSetIJacobian(*ts, Amat, Pmat, NULL, NULL)); 437 PetscCall(MatDestroy(&Amat)); 438 PetscCall(MatDestroy(&Pmat)); 439 } 440 } 441 } else { 442 if (!user->op_rhs) SETERRQ(comm, PETSC_ERR_ARG_NULL, "Problem does not provide RHSFunction"); 443 PetscCall(TSSetType(*ts, TSRK)); 444 PetscCall(TSRKSetType(*ts, TSRK5F)); 445 PetscCall(TSSetRHSFunction(*ts, NULL, RHS_NS, &user)); 446 } 447 PetscCall(TSSetMaxTime(*ts, 500. * user->units->second)); 448 PetscCall(TSSetExactFinalTime(*ts, TS_EXACTFINALTIME_STEPOVER)); 449 PetscCall(TSSetErrorIfStepFails(*ts, PETSC_FALSE)); 450 PetscCall(TSSetTimeStep(*ts, 1.e-2 * user->units->second)); 451 if (app_ctx->test_mode) { 452 PetscCall(TSSetMaxSteps(*ts, 10)); 453 } 454 PetscCall(TSGetAdapt(*ts, &adapt)); 455 PetscCall(TSAdaptSetStepLimits(adapt, 1.e-12 * user->units->second, 1.e2 * user->units->second)); 456 PetscCall(TSSetFromOptions(*ts)); 457 user->time = -1.0; // require all BCs and ctx to be updated 458 user->dt = -1.0; 459 if (!app_ctx->cont_steps) { // print initial condition 460 if (!app_ctx->test_mode) { 461 PetscCall(TSMonitor_NS(*ts, 0, 0., *Q, user)); 462 } 463 } else { // continue from time of last output 464 PetscInt count; 465 PetscViewer viewer; 466 467 if (app_ctx->cont_time <= 0) { // Legacy files did not include step number and time 468 PetscCall(PetscViewerBinaryOpen(comm, app_ctx->cont_time_file, FILE_MODE_READ, &viewer)); 469 PetscCall(PetscViewerBinaryRead(viewer, &app_ctx->cont_time, 1, &count, PETSC_REAL)); 470 PetscCall(PetscViewerDestroy(&viewer)); 471 PetscCheck(app_ctx->cont_steps != -1, comm, PETSC_ERR_ARG_INCOMP, 472 "-continue step number not specified, but checkpoint file does not contain a step number (likely written by older code version)"); 473 } 474 PetscCall(TSSetTime(*ts, app_ctx->cont_time * user->units->second)); 475 PetscCall(TSSetStepNumber(*ts, app_ctx->cont_steps)); 476 } 477 if (!app_ctx->test_mode) { 478 PetscCall(TSMonitorSet(*ts, TSMonitor_NS, user, NULL)); 479 } 480 481 // Solve 482 PetscReal start_time; 483 PetscInt start_step; 484 PetscCall(TSGetTime(*ts, &start_time)); 485 PetscCall(TSGetStepNumber(*ts, &start_step)); 486 487 PetscPreLoadBegin(PETSC_FALSE, "Fluids Solve"); 488 PetscCall(TSSetTime(*ts, start_time)); 489 PetscCall(TSSetStepNumber(*ts, start_step)); 490 if (PetscPreLoadingOn) { 491 // LCOV_EXCL_START 492 SNES snes; 493 Vec Q_preload; 494 PetscReal rtol; 495 PetscCall(VecDuplicate(*Q, &Q_preload)); 496 PetscCall(VecCopy(*Q, Q_preload)); 497 PetscCall(TSGetSNES(*ts, &snes)); 498 PetscCall(SNESGetTolerances(snes, NULL, &rtol, NULL, NULL, NULL)); 499 PetscCall(SNESSetTolerances(snes, PETSC_DEFAULT, .99, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT)); 500 PetscCall(TSSetSolution(*ts, *Q)); 501 PetscCall(TSStep(*ts)); 502 PetscCall(SNESSetTolerances(snes, PETSC_DEFAULT, rtol, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT)); 503 PetscCall(VecDestroy(&Q_preload)); 504 // LCOV_EXCL_STOP 505 } else { 506 PetscCall(PetscBarrier((PetscObject)*ts)); 507 PetscCall(TSSolve(*ts, *Q)); 508 } 509 PetscPreLoadEnd(); 510 511 PetscCall(TSGetSolveTime(*ts, &final_time)); 512 *f_time = final_time; 513 514 if (!app_ctx->test_mode) { 515 if (user->app_ctx->checkpoint_interval > 0 || user->app_ctx->checkpoint_interval == -1) { 516 PetscInt step_no; 517 PetscCall(TSGetStepNumber(*ts, &step_no)); 518 PetscCall(WriteOutput(user, *Q, step_no, final_time)); 519 } 520 521 PetscLogEvent stage_id; 522 PetscStageLog stage_log; 523 524 PetscCall(PetscLogStageGetId("Fluids Solve", &stage_id)); 525 PetscCall(PetscLogGetStageLog(&stage_log)); 526 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Time taken for solution (sec): %g\n", stage_log->stageInfo[stage_id].perfInfo.time)); 527 } 528 PetscFunctionReturn(0); 529 } 530