xref: /honee/src/differential_filter.c (revision 991aef52b7f76ea745826c507d0f3e4bba35bb34) 
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 
12 #include <petscdmplex.h>
13 #include <petsc/private/petscimpl.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       default:
41         SETERRQ(PetscObjectComm((PetscObject)user->dm), PETSC_ERR_SUP, "Differential filtering not available for chosen state variable");
42     }
43     if (diff_filter->do_mms_test) {
44       PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_rhs));
45       PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_MMS_RHS, DifferentialFilter_MMS_RHS_loc, &qf_rhs));
46     }
47 
48     PetscCallCeed(ceed, CeedQFunctionSetContext(qf_rhs, diff_filter_qfctx));
49     PetscCallCeed(ceed, CeedQFunctionAddInput(qf_rhs, "q", num_comp_q, CEED_EVAL_INTERP));
50     PetscCallCeed(ceed, CeedQFunctionAddInput(qf_rhs, "qdata", num_comp_qd, CEED_EVAL_NONE));
51     PetscCallCeed(ceed, CeedQFunctionAddInput(qf_rhs, "x", num_comp_x, CEED_EVAL_INTERP));
52     for (PetscInt i = 0; i < diff_filter->num_filtered_fields; i++) {
53       char field_name[PETSC_MAX_PATH_LEN];
54       PetscCall(PetscSNPrintf(field_name, PETSC_MAX_PATH_LEN, "v%" PetscInt_FMT, i));
55       PetscCallCeed(ceed, CeedQFunctionAddOutput(qf_rhs, field_name, diff_filter->num_field_components[i], CEED_EVAL_INTERP));
56     }
57 
58     PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_rhs, NULL, NULL, &op_rhs));
59     PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, "q", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE));
60     PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_NONE, ceed_data->q_data));
61     PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, "x", ceed_data->elem_restr_x, ceed_data->basis_x, ceed_data->x_coord));
62     for (PetscInt dm_field = 0; dm_field < diff_filter->num_filtered_fields; dm_field++) {
63       char                field_name[PETSC_MAX_PATH_LEN];
64       CeedElemRestriction elem_restr_filter;
65       CeedBasis           basis_filter;
66       DMLabel             domain_label = NULL;
67       PetscInt            label_value = 0, height = 0;
68       PetscCall(DMPlexCeedElemRestrictionCreate(ceed, dm_filter, domain_label, label_value, height, dm_field, &elem_restr_filter));
69       PetscCall(CreateBasisFromPlex(ceed, dm_filter, domain_label, label_value, height, dm_field, &basis_filter));
70 
71       PetscCall(PetscSNPrintf(field_name, PETSC_MAX_PATH_LEN, "v%" PetscInt_FMT, dm_field));
72       PetscCallCeed(ceed, CeedOperatorSetField(op_rhs, field_name, elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
73     }
74 
75     PetscCall(OperatorApplyContextCreate(user->dm, dm_filter, ceed, op_rhs, NULL, NULL, user->Q_loc, NULL, &diff_filter->op_rhs_ctx));
76 
77     PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_rhs));
78     PetscCallCeed(ceed, CeedOperatorDestroy(&op_rhs));
79   }
80 
81   {  // Setup LHS Operator and KSP for the differential filtering solve
82     CeedOperator        op_lhs;
83     Mat                 mat_lhs;
84     CeedInt             num_comp_qd;
85     PetscInt            dim, num_comp_grid_aniso;
86     CeedElemRestriction elem_restr_grid_aniso;
87     CeedVector          grid_aniso_ceed;
88 
89     PetscCall(DMGetDimension(user->dm, &dim));
90     PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_qd_i, &num_comp_qd));
91 
92     // -- Get Grid anisotropy tensor
93     PetscCall(GridAnisotropyTensorCalculateCollocatedVector(ceed, user, ceed_data, &elem_restr_grid_aniso, &grid_aniso_ceed, &num_comp_grid_aniso));
94 
95     PetscCallCeed(ceed, CeedCompositeOperatorCreate(ceed, &op_lhs));
96     for (PetscInt i = 0; i < diff_filter->num_filtered_fields; i++) {
97       CeedQFunction       qf_lhs;
98       PetscInt            num_comp_filter = diff_filter->num_field_components[i];
99       CeedOperator        op_lhs_sub;
100       CeedElemRestriction elem_restr_filter;
101       CeedBasis           basis_filter;
102 
103       switch (num_comp_filter) {
104         case 1:
105           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_1, DifferentialFilter_LHS_1_loc, &qf_lhs));
106           break;
107         case 5:
108           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_5, DifferentialFilter_LHS_5_loc, &qf_lhs));
109           break;
110         case 6:
111           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_6, DifferentialFilter_LHS_6_loc, &qf_lhs));
112           break;
113         case 11:
114           PetscCallCeed(ceed, CeedQFunctionCreateInterior(ceed, 1, DifferentialFilter_LHS_11, DifferentialFilter_LHS_11_loc, &qf_lhs));
115           break;
116         default:
117           SETERRQ(PetscObjectComm((PetscObject)user->dm), PETSC_ERR_SUP, "Differential filtering not available for (%" PetscInt_FMT ") components",
118                   num_comp_filter);
119       }
120 
121       PetscCallCeed(ceed, CeedQFunctionSetContext(qf_lhs, diff_filter_qfctx));
122       PetscCallCeed(ceed, CeedQFunctionSetUserFlopsEstimate(qf_lhs, 0));
123       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "q", num_comp_filter, CEED_EVAL_INTERP));
124       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "Grad_q", num_comp_filter * dim, CEED_EVAL_GRAD));
125       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "anisotropy tensor", num_comp_grid_aniso, CEED_EVAL_NONE));
126       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "x", num_comp_x, CEED_EVAL_INTERP));
127       PetscCallCeed(ceed, CeedQFunctionAddInput(qf_lhs, "qdata", num_comp_qd, CEED_EVAL_NONE));
128       PetscCallCeed(ceed, CeedQFunctionAddOutput(qf_lhs, "v", num_comp_filter, CEED_EVAL_INTERP));
129       PetscCallCeed(ceed, CeedQFunctionAddOutput(qf_lhs, "Grad_v", num_comp_filter * dim, CEED_EVAL_GRAD));
130 
131       {
132         CeedOperatorField op_field;
133         char              field_name[PETSC_MAX_PATH_LEN];
134         PetscCall(PetscSNPrintf(field_name, PETSC_MAX_PATH_LEN, "v%" PetscInt_FMT, i));
135         PetscCallCeed(ceed, CeedOperatorGetFieldByName(diff_filter->op_rhs_ctx->op, field_name, &op_field));
136         PetscCallCeed(ceed, CeedOperatorFieldGetElemRestriction(op_field, &elem_restr_filter));
137         PetscCallCeed(ceed, CeedOperatorFieldGetBasis(op_field, &basis_filter));
138       }
139 
140       PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_lhs, NULL, NULL, &op_lhs_sub));
141       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "q", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
142       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "Grad_q", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
143       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "anisotropy tensor", elem_restr_grid_aniso, CEED_BASIS_NONE, grid_aniso_ceed));
144       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "x", ceed_data->elem_restr_x, ceed_data->basis_x, ceed_data->x_coord));
145       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_NONE, ceed_data->q_data));
146       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "v", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
147       PetscCallCeed(ceed, CeedOperatorSetField(op_lhs_sub, "Grad_v", elem_restr_filter, basis_filter, CEED_VECTOR_ACTIVE));
148 
149       PetscCallCeed(ceed, CeedCompositeOperatorAddSub(op_lhs, op_lhs_sub));
150       PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_lhs));
151       PetscCallCeed(ceed, CeedOperatorDestroy(&op_lhs_sub));
152     }
153     PetscCallCeed(ceed, CeedOperatorGetContextFieldLabel(op_lhs, "filter width scaling", &diff_filter->filter_width_scaling_label));
154     PetscCall(MatCeedCreate(dm_filter, dm_filter, op_lhs, NULL, &mat_lhs));
155 
156     PetscCall(KSPCreate(PetscObjectComm((PetscObject)dm_filter), &diff_filter->ksp));
157     PetscCall(KSPSetOptionsPrefix(diff_filter->ksp, "diff_filter_"));
158     {
159       PC pc;
160       PetscCall(KSPGetPC(diff_filter->ksp, &pc));
161       PetscCall(PCSetType(pc, PCJACOBI));
162       PetscCall(PCJacobiSetType(pc, PC_JACOBI_DIAGONAL));
163       PetscCall(KSPSetType(diff_filter->ksp, KSPCG));
164       PetscCall(KSPSetNormType(diff_filter->ksp, KSP_NORM_NATURAL));
165       PetscCall(KSPSetTolerances(diff_filter->ksp, 1e-10, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT));
166     }
167     PetscCall(KSPSetFromOptions_WithMatCeed(diff_filter->ksp, mat_lhs));
168 
169     PetscCall(MatDestroy(&mat_lhs));
170     PetscCallCeed(ceed, CeedOperatorDestroy(&op_lhs));
171   }
172   PetscFunctionReturn(PETSC_SUCCESS);
173 }
174 
175 // @brief Setup DM, operators, contexts, etc. for performing differential filtering
176 PetscErrorCode DifferentialFilterSetup(Ceed ceed, User user, CeedData ceed_data, ProblemData problem) {
177   MPI_Comm                  comm = user->comm;
178   NewtonianIdealGasContext  gas;
179   DifferentialFilterContext diff_filter_ctx;
180   CeedQFunctionContext      diff_filter_qfctx;
181 
182   PetscFunctionBeginUser;
183   PetscCall(PetscNew(&user->diff_filter));
184   DiffFilterData diff_filter = user->diff_filter;
185   PetscCall(PetscOptionsGetBool(NULL, NULL, "-diff_filter_mms", &diff_filter->do_mms_test, NULL));
186 
187   {  // Create DM for filtered quantities
188     PetscSection section;
189 
190     PetscCall(DMClone(user->dm, &diff_filter->dm_filter));
191     PetscCall(PetscObjectSetName((PetscObject)diff_filter->dm_filter, "Differential Filtering"));
192 
193     diff_filter->num_filtered_fields = diff_filter->do_mms_test ? 1 : 2;
194     PetscCall(PetscMalloc1(diff_filter->num_filtered_fields, &diff_filter->num_field_components));
195 
196     if (diff_filter->do_mms_test) {
197       PetscInt field_components;
198       diff_filter->num_field_components[0] = field_components = 1;
199       PetscCall(DMSetupByOrder_FEM(PETSC_TRUE, PETSC_TRUE, user->app_ctx->degree, 1, user->app_ctx->q_extra, diff_filter->num_filtered_fields,
200                                    &field_components, diff_filter->dm_filter));
201 
202       PetscCall(DMGetLocalSection(diff_filter->dm_filter, &section));
203       PetscCall(PetscSectionSetFieldName(section, 0, ""));
204       PetscCall(PetscSectionSetComponentName(section, 0, 0, "FilteredPhi"));
205     } else {
206       PetscInt field_components[2];
207       diff_filter->num_field_components[0] = field_components[0] = DIFF_FILTER_STATE_NUM;
208       diff_filter->num_field_components[1] = field_components[1] = DIFF_FILTER_VELOCITY_SQUARED_NUM;
209       PetscCall(DMSetupByOrder_FEM(PETSC_TRUE, PETSC_TRUE, user->app_ctx->degree, 1, user->app_ctx->q_extra, diff_filter->num_filtered_fields,
210                                    field_components, diff_filter->dm_filter));
211 
212       diff_filter->field_prim_state = 0;
213       diff_filter->field_velo_prod  = 1;
214       PetscCall(DMGetLocalSection(diff_filter->dm_filter, &section));
215       PetscCall(PetscSectionSetFieldName(section, diff_filter->field_prim_state, "Filtered Primitive State Variables"));
216       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_PRESSURE, "FilteredPressure"));
217       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_VELOCITY_X, "FilteredVelocityX"));
218       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_VELOCITY_Y, "FilteredVelocityY"));
219       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_VELOCITY_Z, "FilteredVelocityZ"));
220       PetscCall(PetscSectionSetComponentName(section, 0, DIFF_FILTER_TEMPERATURE, "FilteredTemperature"));
221       PetscCall(PetscSectionSetFieldName(section, diff_filter->field_velo_prod, "Filtered Velocity Products"));
222       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_XX, "FilteredVelocitySquaredXX"));
223       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_YY, "FilteredVelocitySquaredYY"));
224       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_ZZ, "FilteredVelocitySquaredZZ"));
225       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_YZ, "FilteredVelocitySquaredYZ"));
226       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_XZ, "FilteredVelocitySquaredXZ"));
227       PetscCall(PetscSectionSetComponentName(section, 1, DIFF_FILTER_VELOCITY_SQUARED_XY, "FilteredVelocitySquaredXY"));
228     }
229   }
230 
231   PetscCall(PetscNew(&diff_filter_ctx));
232   diff_filter_ctx->grid_based_width = false;
233   for (int i = 0; i < 3; i++) diff_filter_ctx->width_scaling[i] = 1;
234   diff_filter_ctx->kernel_scaling   = 0.1;
235   diff_filter_ctx->damping_function = DIFF_FILTER_DAMP_NONE;
236   diff_filter_ctx->friction_length  = 0;
237   diff_filter_ctx->damping_constant = 25;
238 
239   PetscOptionsBegin(comm, NULL, "Differential Filtering Options", NULL);
240   PetscInt narray = 3;
241   PetscCall(PetscOptionsBool("-diff_filter_grid_based_width", "Use filter width based on the grid size", NULL, diff_filter_ctx->grid_based_width,
242                              (PetscBool *)&diff_filter_ctx->grid_based_width, NULL));
243   PetscCall(PetscOptionsRealArray("-diff_filter_width_scaling", "Anisotropic scaling of filter width tensor", NULL, diff_filter_ctx->width_scaling,
244                                   &narray, NULL));
245   PetscCall(PetscOptionsReal("-diff_filter_kernel_scaling", "Scaling to make differential kernel size \"equivalent\" to other filter kernels", NULL,
246                              diff_filter_ctx->kernel_scaling, &diff_filter_ctx->kernel_scaling, NULL));
247   PetscCall(PetscOptionsEnum("-diff_filter_wall_damping_function", "Damping function to use at the wall", NULL, DifferentialFilterDampingFunctions,
248                              (PetscEnum)(diff_filter_ctx->damping_function), (PetscEnum *)&diff_filter_ctx->damping_function, NULL));
249   PetscCall(PetscOptionsReal("-diff_filter_wall_damping_constant", "Contant for the wall-damping function", NULL, diff_filter_ctx->damping_constant,
250                              &diff_filter_ctx->damping_constant, NULL));
251   PetscCall(PetscOptionsReal("-diff_filter_friction_length", "Friction length associated with the flow, \\delta_\\nu. For wall-damping functions",
252                              NULL, diff_filter_ctx->friction_length, &diff_filter_ctx->friction_length, NULL));
253   PetscOptionsEnd();
254 
255   Units units = user->units;
256   for (int i = 0; i < 3; i++) diff_filter_ctx->width_scaling[i] *= units->meter;
257   diff_filter_ctx->kernel_scaling *= units->meter;
258   diff_filter_ctx->friction_length *= units->meter;
259 
260   // -- Create QFContext
261   PetscCallCeed(ceed, CeedQFunctionContextGetDataRead(problem->apply_vol_ifunction.qfunction_context, CEED_MEM_HOST, &gas));
262   diff_filter_ctx->gas = *gas;
263   PetscCallCeed(ceed, CeedQFunctionContextRestoreDataRead(problem->apply_vol_ifunction.qfunction_context, &gas));
264 
265   PetscCallCeed(ceed, CeedQFunctionContextCreate(ceed, &diff_filter_qfctx));
266   PetscCallCeed(ceed, CeedQFunctionContextSetData(diff_filter_qfctx, CEED_MEM_HOST, CEED_USE_POINTER, sizeof(*diff_filter_ctx), diff_filter_ctx));
267   PetscCallCeed(ceed, CeedQFunctionContextSetDataDestroy(diff_filter_qfctx, CEED_MEM_HOST, FreeContextPetsc));
268   PetscCallCeed(ceed, CeedQFunctionContextRegisterDouble(
269                           diff_filter_qfctx, "filter width scaling", offsetof(struct DifferentialFilterContext_, width_scaling),
270                           sizeof(diff_filter_ctx->width_scaling) / sizeof(diff_filter_ctx->width_scaling[0]), "Filter width scaling"));
271 
272   // -- Setup Operators
273   PetscCall(DifferentialFilterCreateOperators(ceed, user, ceed_data, diff_filter_qfctx));
274 
275   PetscCallCeed(ceed, CeedQFunctionContextDestroy(&diff_filter_qfctx));
276   PetscFunctionReturn(PETSC_SUCCESS);
277 }
278 
279 // @brief Apply differential filter to the solution given by Q
280 PetscErrorCode DifferentialFilterApply(User user, const PetscReal solution_time, const Vec Q, Vec Filtered_Solution) {
281   DiffFilterData   diff_filter = user->diff_filter;
282   PetscObjectState X_loc_state;
283   Vec              RHS;
284 
285   PetscFunctionBeginUser;
286   PetscCall(PetscLogEventBegin(FLUIDS_DifferentialFilter, Q, Filtered_Solution, 0, 0));
287   PetscCall(DMGetNamedGlobalVector(diff_filter->dm_filter, "RHS", &RHS));
288   PetscCall(UpdateBoundaryValues(user, diff_filter->op_rhs_ctx->X_loc, solution_time));
289   PetscCall(PetscObjectStateGet((PetscObject)diff_filter->op_rhs_ctx->X_loc, &X_loc_state));
290   if (X_loc_state != diff_filter->X_loc_state) {
291     PetscCall(ApplyCeedOperatorGlobalToGlobal(Q, RHS, diff_filter->op_rhs_ctx));
292     PetscCall(PetscObjectStateGet((PetscObject)diff_filter->op_rhs_ctx->X_loc, &X_loc_state));
293     diff_filter->X_loc_state = X_loc_state;
294   }
295   PetscCall(VecViewFromOptions(RHS, NULL, "-diff_filter_rhs_view"));
296 
297   PetscCall(KSPSolve(diff_filter->ksp, RHS, Filtered_Solution));
298   PetscCall(DMRestoreNamedGlobalVector(diff_filter->dm_filter, "RHS", &RHS));
299   PetscCall(PetscLogEventEnd(FLUIDS_DifferentialFilter, Q, Filtered_Solution, 0, 0));
300   PetscFunctionReturn(PETSC_SUCCESS);
301 }
302 
303 // @brief TSMonitor for just applying differential filtering to the simulation
304 // This runs every time step and is primarily for testing purposes
305 PetscErrorCode TSMonitor_DifferentialFilter(TS ts, PetscInt steps, PetscReal solution_time, Vec Q, void *ctx) {
306   User           user        = (User)ctx;
307   DiffFilterData diff_filter = user->diff_filter;
308   Vec            Filtered_Field;
309 
310   PetscFunctionBeginUser;
311   PetscCall(DMGetGlobalVector(diff_filter->dm_filter, &Filtered_Field));
312 
313   PetscCall(DifferentialFilterApply(user, solution_time, Q, Filtered_Field));
314   PetscCall(VecViewFromOptions(Filtered_Field, NULL, "-diff_filter_view"));
315   if (user->app_ctx->test_type == TESTTYPE_DIFF_FILTER) PetscCall(RegressionTest(user->app_ctx, Filtered_Field));
316 
317   PetscCall(DMRestoreGlobalVector(diff_filter->dm_filter, &Filtered_Field));
318   PetscFunctionReturn(PETSC_SUCCESS);
319 }
320 
321 PetscErrorCode DifferentialFilterDataDestroy(DiffFilterData diff_filter) {
322   PetscFunctionBeginUser;
323   if (!diff_filter) PetscFunctionReturn(PETSC_SUCCESS);
324 
325   PetscCall(OperatorApplyContextDestroy(diff_filter->op_rhs_ctx));
326   PetscCall(DMDestroy(&diff_filter->dm_filter));
327   PetscCall(KSPDestroy(&diff_filter->ksp));
328 
329   PetscCall(PetscFree(diff_filter->num_field_components));
330   PetscCall(PetscFree(diff_filter));
331   PetscFunctionReturn(PETSC_SUCCESS);
332 }
333 
334 PetscErrorCode DifferentialFilterMmsICSetup(ProblemData problem) {
335   PetscFunctionBeginUser;
336   problem->ics.qfunction     = DifferentialFilter_MMS_IC;
337   problem->ics.qfunction_loc = DifferentialFilter_MMS_IC_loc;
338   PetscFunctionReturn(PETSC_SUCCESS);
339 }
340