xref: /honee/src/differential_filter.c (revision 21ba7ba458ca7fbd5416be1f0b0586f2885778ca) 
1 // Copyright (c) 2017-2024, 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 /// @file
8 /// Functions for setting up and performing differential filtering
9 
10 #include "../qfunctions/differential_filter.h"
11 #include <ceed.h>
12 
13 #include <petscdmplex.h>
14 
15 #include <navierstokes.h>
16 
17 // @brief Create RHS and LHS operators for differential filtering
18 PetscErrorCode DifferentialFilterCreateOperators(Ceed ceed, User user, CeedData ceed_data, CeedQFunctionContext diff_filter_qfctx) {
19   DiffFilterData diff_filter = user->diff_filter;
20   DM             dm_filter   = diff_filter->dm_filter;
21   CeedInt        num_comp_q, num_comp_qd, num_comp_x;
22   PetscInt       dim;
23 
24   PetscFunctionBeginUser;
25   PetscCall(DMGetDimension(user->dm, &dim));
26   PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_x, &num_comp_x));
27   PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_q, &num_comp_q));
28   PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_qd_i, &num_comp_qd));
29 
30   {  // -- Create RHS MatopApplyContext
31     CeedQFunction qf_rhs;
32     CeedOperator  op_rhs;
33     switch (user->phys->state_var) {
34       case STATEVAR_PRIMITIVE:
35         PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_RHS_Prim, DifferentialFilter_RHS_Prim_loc, &qf_rhs));
36         break;
37       case STATEVAR_CONSERVATIVE:
38         PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_RHS_Conserv, DifferentialFilter_RHS_Conserv_loc, &qf_rhs));
39         break;
40       case STATEVAR_ENTROPY:
41         PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_RHS_Entropy, DifferentialFilter_RHS_Entropy_loc, &qf_rhs));
42         break;
43     }
44     if (diff_filter->do_mms_test) {
45       PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_rhs));
46       PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_MMS_RHS, DifferentialFilter_MMS_RHS_loc, &qf_rhs));
47     }
48 
49     PetscCallCeed(ceed, CeedQFunctionSetContext(qf_rhs, diff_filter_qfctx));
50     PetscCallCeed(ceed, CeedQFunctionAddInput(qf_rhs, "q", num_comp_q, CEED_EVAL_INTERP));
51     PetscCallCeed(ceed, CeedQFunctionAddInput(qf_rhs, "qdata", num_comp_qd, CEED_EVAL_NONE));
52     PetscCallCeed(ceed, CeedQFunctionAddInput(qf_rhs, "x", num_comp_x, CEED_EVAL_INTERP));
53     for (PetscInt i = 0; i < diff_filter->num_filtered_fields; i++) {
54       char field_name[PETSC_MAX_PATH_LEN];
55       PetscCall(PetscSNPrintf(field_name, PETSC_MAX_PATH_LEN, "v%" PetscInt_FMT, i));
56       PetscCallCeed(ceed, CeedQFunctionAddOutput(qf_rhs, field_name, diff_filter->num_field_components[i], CEED_EVAL_INTERP));
57     }
58 
59     PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_rhs, NULL, NULL, &op_rhs));
60     PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, "q", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE));
61     PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_NONE, ceed_data->q_data));
62     PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, "x", ceed_data->elem_restr_x, ceed_data->basis_x, ceed_data->x_coord));
63     for (PetscInt dm_field = 0; dm_field < diff_filter->num_filtered_fields; dm_field++) {
64       char                field_name[PETSC_MAX_PATH_LEN];
65       CeedElemRestriction elem_restr_filter;
66       CeedBasis           basis_filter;
67       DMLabel             domain_label = NULL;
68       PetscInt            label_value = 0, height = 0;
69       PetscCall(DMPlexCeedElemRestrictionCreate(ceed, dm_filter, domain_label, label_value, height, dm_field, &elem_restr_filter));
70       PetscCall(CreateBasisFromPlex(ceed, dm_filter, domain_label, label_value, height, dm_field, &basis_filter));
71 
72       PetscCall(PetscSNPrintf(field_name, PETSC_MAX_PATH_LEN, "v%" PetscInt_FMT, dm_field));
73       PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, field_name, elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
74 
75       PetscCallCeed(ceed, CeedElemRestrictionDestroy(&elem_restr_filter));
76       PetscCallCeed(ceed, CeedBasisDestroy(&basis_filter));
77     }
78 
79     PetscCall(OperatorApplyContextCreate(user->dm, dm_filter, ceed, op_rhs, NULL, NULL, user->Q_loc, NULL, &diff_filter->op_rhs_ctx));
80 
81     PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_rhs));
82     PetscCallCeed(ceed, CeedOperatorDestroy(&op_rhs));
83   }
84 
85   {  // Setup LHS Operator and KSP for the differential filtering solve
86     CeedOperator        op_lhs;
87     Mat                 mat_lhs;
88     CeedInt             num_comp_qd;
89     PetscInt            dim, num_comp_grid_aniso;
90     CeedElemRestriction elem_restr_grid_aniso;
91     CeedVector          grid_aniso_ceed;
92 
93     PetscCall(DMGetDimension(user->dm, &dim));
94     PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_qd_i, &num_comp_qd));
95 
96     // -- Get Grid anisotropy tensor
97     PetscCall(GridAnisotropyTensorCalculateCollocatedVector(ceed, user, ceed_data, &elem_restr_grid_aniso, &grid_aniso_ceed, &num_comp_grid_aniso));
98 
99     PetscCallCeed(ceed, CeedCompositeOperatorCreate(ceed, &op_lhs));
100     for (PetscInt i = 0; i < diff_filter->num_filtered_fields; i++) {
101       CeedQFunction       qf_lhs;
102       PetscInt            num_comp_filter = diff_filter->num_field_components[i];
103       CeedOperator        op_lhs_sub;
104       CeedElemRestriction elem_restr_filter;
105       CeedBasis           basis_filter;
106 
107       switch (num_comp_filter) {
108         case 1:
109           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_1, DifferentialFilter_LHS_1_loc, &qf_lhs));
110           break;
111         case 5:
112           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_5, DifferentialFilter_LHS_5_loc, &qf_lhs));
113           break;
114         case 6:
115           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_6, DifferentialFilter_LHS_6_loc, &qf_lhs));
116           break;
117         case 11:
118           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_11, DifferentialFilter_LHS_11_loc, &qf_lhs));
119           break;
120         default:
121           SETERRQ(PetscObjectComm((PetscObject)user->dm), PETSC_ERR_SUP, "Differential filtering not available for (%" PetscInt_FMT ") components",
122                   num_comp_filter);
123       }
124 
125       PetscCallCeed(ceed, CeedQFunctionSetContext(qf_lhs, diff_filter_qfctx));
126       PetscCallCeed(ceed, CeedQFunctionSetUserFlopsEstimate(qf_lhs, 0));
127       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "q", num_comp_filter, CEED_EVAL_INTERP));
128       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "Grad_q", num_comp_filter * dim, CEED_EVAL_GRAD));
129       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "anisotropy tensor", num_comp_grid_aniso, CEED_EVAL_NONE));
130       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "x", num_comp_x, CEED_EVAL_INTERP));
131       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "qdata", num_comp_qd, CEED_EVAL_NONE));
132       PetscCallCeed(ceed, CeedQFunctionAddOutput(qf_lhs, "v", num_comp_filter, CEED_EVAL_INTERP));
133       PetscCallCeed(ceed, CeedQFunctionAddOutput(qf_lhs, "Grad_v", num_comp_filter * dim, CEED_EVAL_GRAD));
134 
135       {
136         CeedOperatorField op_field;
137         char              field_name[PETSC_MAX_PATH_LEN];
138         PetscCall(PetscSNPrintf(field_name, PETSC_MAX_PATH_LEN, "v%" PetscInt_FMT, i));
139         PetscCallCeed(ceed, CeedOperatorGetFieldByName(diff_filter->op_rhs_ctx->op, field_name, &op_field));
140         PetscCallCeed(ceed, CeedOperatorFieldGetElemRestriction(op_field, &elem_restr_filter));
141         PetscCallCeed(ceed, CeedOperatorFieldGetBasis(op_field, &basis_filter));
142       }
143 
144       PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_lhs, NULL, NULL, &op_lhs_sub));
145       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "q", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
146       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "Grad_q", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
147       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "anisotropy tensor", elem_restr_grid_aniso, CEED_BASIS_NONE, grid_aniso_ceed));
148       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "x", ceed_data->elem_restr_x, ceed_data->basis_x, ceed_data->x_coord));
149       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_NONE, ceed_data->q_data));
150       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "v", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
151       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "Grad_v", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
152 
153       PetscCallCeed(ceed, CeedCompositeOperatorAddSub(op_lhs, op_lhs_sub));
154       PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_lhs));
155       PetscCallCeed(ceed, CeedOperatorDestroy(&op_lhs_sub));
156     }
157     PetscCallCeed(ceed, CeedVectorDestroy(&grid_aniso_ceed));
158     PetscCallCeed(ceed, CeedElemRestrictionDestroy(&elem_restr_grid_aniso));
159 
160     PetscCallCeed(ceed, CeedOperatorGetContextFieldLabel(op_lhs, "filter width scaling", &diff_filter->filter_width_scaling_label));
161     PetscCall(MatCreateCeed(dm_filter, dm_filter, op_lhs, NULL, &mat_lhs));
162 
163     PetscCall(KSPCreate(PetscObjectComm((PetscObject)dm_filter), &diff_filter->ksp));
164     PetscCall(KSPSetOptionsPrefix(diff_filter->ksp, "diff_filter_"));
165     {
166       PC pc;
167       PetscCall(KSPGetPC(diff_filter->ksp, &pc));
168       PetscCall(PCSetType(pc, PCJACOBI));
169       PetscCall(PCJacobiSetType(pc, PC_JACOBI_DIAGONAL));
170       PetscCall(KSPSetType(diff_filter->ksp, KSPCG));
171       PetscCall(KSPSetNormType(diff_filter->ksp, KSP_NORM_NATURAL));
172       PetscCall(KSPSetTolerances(diff_filter->ksp, 1e-10, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT));
173     }
174     PetscCall(KSPSetFromOptions_WithMatCeed(diff_filter->ksp, mat_lhs));
175 
176     PetscCall(MatDestroy(&mat_lhs));
177     PetscCallCeed(ceed, CeedOperatorDestroy(&op_lhs));
178   }
179   PetscFunctionReturn(PETSC_SUCCESS);
180 }
181 
182 // @brief Setup DM, operators, contexts, etc. for performing differential filtering
183 PetscErrorCode DifferentialFilterSetup(Ceed ceed, User user, CeedData ceed_data, ProblemData problem) {
184   MPI_Comm                  comm = user->comm;
185   NewtonianIdealGasContext  gas;
186   DifferentialFilterContext diff_filter_ctx;
187   CeedQFunctionContext      diff_filter_qfctx;
188 
189   PetscFunctionBeginUser;
190   PetscCall(PetscNew(&user->diff_filter));
191   DiffFilterData diff_filter = user->diff_filter;
192   PetscCall(PetscOptionsGetBool(NULL, NULL, "-diff_filter_mms", &diff_filter->do_mms_test, NULL));
193 
194   {  // Create DM for filtered quantities
195     PetscSection section;
196 
197     PetscCall(DMClone(user->dm, &diff_filter->dm_filter));
198     PetscCall(PetscObjectSetName((PetscObject)diff_filter->dm_filter, "Differential Filtering"));
199 
200     diff_filter->num_filtered_fields = diff_filter->do_mms_test ? 1 : 2;
201     PetscCall(PetscMalloc1(diff_filter->num_filtered_fields, &diff_filter->num_field_components));
202 
203     if (diff_filter->do_mms_test) {
204       PetscInt field_components;
205       diff_filter->num_field_components[0] = field_components = 1;
206       PetscCall(DMSetupByOrder_FEM(PETSC_TRUE, PETSC_TRUE, user->app_ctx->degree, 1, user->app_ctx->q_extra, diff_filter->num_filtered_fields,
207                                    &field_components, diff_filter->dm_filter));
208 
209       PetscCall(DMGetLocalSection(diff_filter->dm_filter, &section));
210       PetscCall(PetscSectionSetFieldName(section, 0, ""));
211       PetscCall(PetscSectionSetComponentName(section, 0, 0, "FilteredPhi"));
212     } else {
213       PetscInt field_components[2];
214       diff_filter->num_field_components[0] = field_components[0] = DIFF_FILTER_STATE_NUM;
215       diff_filter->num_field_components[1] = field_components[1] = DIFF_FILTER_VELOCITY_SQUARED_NUM;
216       PetscCall(DMSetupByOrder_FEM(PETSC_TRUE, PETSC_TRUE, user->app_ctx->degree, 1, user->app_ctx->q_extra, diff_filter->num_filtered_fields,
217                                    field_components, diff_filter->dm_filter));
218 
219       diff_filter->field_prim_state = 0;
220       diff_filter->field_velo_prod  = 1;
221       PetscCall(DMGetLocalSection(diff_filter->dm_filter, &section));
222       PetscCall(PetscSectionSetFieldName(section, diff_filter->field_prim_state, "Filtered Primitive State Variables"));
223       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_PRESSURE, "FilteredPressure"));
224       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_VELOCITY_X, "FilteredVelocityX"));
225       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_VELOCITY_Y, "FilteredVelocityY"));
226       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_VELOCITY_Z, "FilteredVelocityZ"));
227       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_TEMPERATURE, "FilteredTemperature"));
228       PetscCall(PetscSectionSetFieldName(section, diff_filter->field_velo_prod, "Filtered Velocity Products"));
229       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_XX, "FilteredVelocitySquaredXX"));
230       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_YY, "FilteredVelocitySquaredYY"));
231       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_ZZ, "FilteredVelocitySquaredZZ"));
232       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_YZ, "FilteredVelocitySquaredYZ"));
233       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_XZ, "FilteredVelocitySquaredXZ"));
234       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_XY, "FilteredVelocitySquaredXY"));
235     }
236   }
237 
238   PetscCall(PetscNew(&diff_filter_ctx));
239   diff_filter_ctx->grid_based_width = false;
240   for (int i = 0; i < 3; i++) diff_filter_ctx->width_scaling[i] = 1;
241   diff_filter_ctx->kernel_scaling   = 0.1;
242   diff_filter_ctx->damping_function = DIFF_FILTER_DAMP_NONE;
243   diff_filter_ctx->friction_length  = 0;
244   diff_filter_ctx->damping_constant = 25;
245 
246   PetscOptionsBegin(comm, NULL, "Differential Filtering Options", NULL);
247   PetscInt narray = 3;
248   PetscCall(PetscOptionsBool("-diff_filter_grid_based_width", "Use filter width based on the grid size", NULL, diff_filter_ctx->grid_based_width,
249                              (PetscBool *)&diff_filter_ctx->grid_based_width, NULL));
250   PetscCall(PetscOptionsRealArray("-diff_filter_width_scaling", "Anisotropic scaling of filter width tensor", NULL, diff_filter_ctx->width_scaling,
251                                   &narray, NULL));
252   PetscCall(PetscOptionsReal("-diff_filter_kernel_scaling", "Scaling to make differential kernel size \"equivalent\" to other filter kernels", NULL,
253                              diff_filter_ctx->kernel_scaling, &diff_filter_ctx->kernel_scaling, NULL));
254   PetscCall(PetscOptionsEnum("-diff_filter_wall_damping_function", "Damping function to use at the wall", NULL, DifferentialFilterDampingFunctions,
255                              (PetscEnum)(diff_filter_ctx->damping_function), (PetscEnum *)&diff_filter_ctx->damping_function, NULL));
256   PetscCall(PetscOptionsReal("-diff_filter_wall_damping_constant", "Contant for the wall-damping function", NULL, diff_filter_ctx->damping_constant,
257                              &diff_filter_ctx->damping_constant, NULL));
258   PetscCall(PetscOptionsReal("-diff_filter_friction_length", "Friction length associated with the flow, \\delta_\\nu. For wall-damping functions",
259                              NULL, diff_filter_ctx->friction_length, &diff_filter_ctx->friction_length, NULL));
260   PetscOptionsEnd();
261 
262   Units units = user->units;
263   for (int i = 0; i < 3; i++) diff_filter_ctx->width_scaling[i] *= units->meter;
264   diff_filter_ctx->kernel_scaling *= units->meter;
265   diff_filter_ctx->friction_length *= units->meter;
266 
267   // -- Create QFContext
268   PetscCallCeed(ceed, CeedQFunctionContextGetDataRead(problem->apply_vol_ifunction.qfunction_context, CEED_MEM_HOST, &gas));
269   diff_filter_ctx->gas = *gas;
270   PetscCallCeed(ceed, CeedQFunctionContextRestoreDataRead(problem->apply_vol_ifunction.qfunction_context, &gas));
271 
272   PetscCallCeed(ceed, CeedQFunctionContextCreate(ceed, &diff_filter_qfctx));
273   PetscCallCeed(ceed, CeedQFunctionContextSetData(diff_filter_qfctx, CEED_MEM_HOST, CEED_USE_POINTER, sizeof(*diff_filter_ctx), diff_filter_ctx));
274   PetscCallCeed(ceed, CeedQFunctionContextSetDataDestroy(diff_filter_qfctx, CEED_MEM_HOST, FreeContextPetsc));
275   PetscCallCeed(ceed, CeedQFunctionContextRegisterDouble(
276                           diff_filter_qfctx, "filter width scaling", offsetof(struct DifferentialFilterContext_, width_scaling),
277                           sizeof(diff_filter_ctx->width_scaling) / sizeof(diff_filter_ctx->width_scaling[0]), "Filter width scaling"));
278 
279   // -- Setup Operators
280   PetscCall(DifferentialFilterCreateOperators(ceed, user, ceed_data, diff_filter_qfctx));
281 
282   PetscCallCeed(ceed, CeedQFunctionContextDestroy(&diff_filter_qfctx));
283   PetscFunctionReturn(PETSC_SUCCESS);
284 }
285 
286 // @brief Apply differential filter to the solution given by Q
287 PetscErrorCode DifferentialFilterApply(User user, const PetscReal solution_time, const Vec Q, Vec Filtered_Solution) {
288   DiffFilterData   diff_filter = user->diff_filter;
289   PetscObjectState X_loc_state;
290   Vec              RHS;
291 
292   PetscFunctionBeginUser;
293   PetscCall(PetscLogEventBegin(FLUIDS_DifferentialFilter, Q, Filtered_Solution, 0, 0));
294   PetscCall(DMGetNamedGlobalVector(diff_filter->dm_filter, "RHS", &RHS));
295   PetscCall(UpdateBoundaryValues(user, diff_filter->op_rhs_ctx->X_loc, solution_time));
296   PetscCall(VecGetState(diff_filter->op_rhs_ctx->X_loc, &X_loc_state));
297   if (X_loc_state != diff_filter->X_loc_state) {
298     PetscCall(ApplyCeedOperatorGlobalToGlobal(Q, RHS, diff_filter->op_rhs_ctx));
299     PetscCall(VecGetState(diff_filter->op_rhs_ctx->X_loc, &X_loc_state));
300     diff_filter->X_loc_state = X_loc_state;
301   }
302   PetscCall(VecViewFromOptions(RHS, NULL, "-diff_filter_rhs_view"));
303 
304   PetscCall(KSPSolve(diff_filter->ksp, RHS, Filtered_Solution));
305   PetscCall(DMRestoreNamedGlobalVector(diff_filter->dm_filter, "RHS", &RHS));
306   PetscCall(PetscLogEventEnd(FLUIDS_DifferentialFilter, Q, Filtered_Solution, 0, 0));
307   PetscFunctionReturn(PETSC_SUCCESS);
308 }
309 
310 // @brief TSMonitor for just applying differential filtering to the simulation
311 // This runs every time step and is primarily for testing purposes
312 PetscErrorCode TSMonitor_DifferentialFilter(TS ts, PetscInt steps, PetscReal solution_time, Vec Q, void *ctx) {
313   User           user        = (User)ctx;
314   DiffFilterData diff_filter = user->diff_filter;
315   Vec            Filtered_Field;
316 
317   PetscFunctionBeginUser;
318   PetscCall(DMGetGlobalVector(diff_filter->dm_filter, &Filtered_Field));
319 
320   PetscCall(DifferentialFilterApply(user, solution_time, Q, Filtered_Field));
321   PetscCall(VecViewFromOptions(Filtered_Field, NULL, "-diff_filter_view"));
322   if (user->app_ctx->test_type == TESTTYPE_DIFF_FILTER) PetscCall(RegressionTest(user->app_ctx, Filtered_Field));
323 
324   PetscCall(DMRestoreGlobalVector(diff_filter->dm_filter, &Filtered_Field));
325   PetscFunctionReturn(PETSC_SUCCESS);
326 }
327 
328 PetscErrorCode DifferentialFilterDataDestroy(DiffFilterData diff_filter) {
329   PetscFunctionBeginUser;
330   if (!diff_filter) PetscFunctionReturn(PETSC_SUCCESS);
331 
332   PetscCall(OperatorApplyContextDestroy(diff_filter->op_rhs_ctx));
333   PetscCall(DMDestroy(&diff_filter->dm_filter));
334   PetscCall(KSPDestroy(&diff_filter->ksp));
335 
336   PetscCall(PetscFree(diff_filter->num_field_components));
337   PetscCall(PetscFree(diff_filter));
338   PetscFunctionReturn(PETSC_SUCCESS);
339 }
340 
341 PetscErrorCode DifferentialFilterMmsICSetup(ProblemData problem) {
342   PetscFunctionBeginUser;
343   problem->ics.qfunction     = DifferentialFilter_MMS_IC;
344   problem->ics.qfunction_loc = DifferentialFilter_MMS_IC_loc;
345   PetscFunctionReturn(PETSC_SUCCESS);
346 }
347