xref: /petsc/src/ts/utils/dmplexts.c (revision 25e51e4eae36a59832e1c7d758a472dbfb66c27a)
1 #include <petsc-private/dmpleximpl.h> /*I "petscdmplex.h" I*/
2 #include <petsc-private/tsimpl.h>     /*I "petscts.h" I*/
3 #include <petscds.h>
4 #include <petscfv.h>
5 
6 #undef __FUNCT__
7 #define __FUNCT__ "DMPlexTSGetGeometryFVM"
8 /*@
9   DMPlexTSGetGeometryFVM - Return precomputed geometric data
10 
11   Input Parameter:
12 . dm - The DM
13 
14   Output Parameters:
15 + facegeom - The values precomputed from face geometry
16 . cellgeom - The values precomputed from cell geometry
17 - minRadius - The minimum radius over the mesh of an inscribed sphere in a cell
18 
19   Level: developer
20 
21 .seealso: DMPlexTSSetRHSFunctionLocal()
22 @*/
23 PetscErrorCode DMPlexTSGetGeometryFVM(DM dm, Vec *facegeom, Vec *cellgeom, PetscReal *minRadius)
24 {
25   DMTS           dmts;
26   PetscObject    obj;
27   PetscErrorCode ierr;
28 
29   PetscFunctionBegin;
30   PetscValidHeaderSpecific(dm,DM_CLASSID,1);
31   ierr = DMGetDMTS(dm, &dmts);CHKERRQ(ierr);
32   ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_facegeom_fvm", &obj);CHKERRQ(ierr);
33   if (!obj) {
34     Vec cellgeom, facegeom;
35 
36     ierr = DMPlexComputeGeometryFVM(dm, &cellgeom, &facegeom);CHKERRQ(ierr);
37     ierr = PetscObjectCompose((PetscObject) dmts, "DMPlexTS_facegeom_fvm", (PetscObject) facegeom);CHKERRQ(ierr);
38     ierr = PetscObjectCompose((PetscObject) dmts, "DMPlexTS_cellgeom_fvm", (PetscObject) cellgeom);CHKERRQ(ierr);
39     ierr = VecDestroy(&facegeom);CHKERRQ(ierr);
40     ierr = VecDestroy(&cellgeom);CHKERRQ(ierr);
41   }
42   if (facegeom) {PetscValidPointer(facegeom, 2); ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_facegeom_fvm", (PetscObject *) facegeom);CHKERRQ(ierr);}
43   if (cellgeom) {PetscValidPointer(cellgeom, 3); ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_cellgeom_fvm", (PetscObject *) cellgeom);CHKERRQ(ierr);}
44   if (minRadius) {ierr = DMPlexGetMinRadius(dm, minRadius);CHKERRQ(ierr);}
45   PetscFunctionReturn(0);
46 }
47 
48 #undef __FUNCT__
49 #define __FUNCT__ "DMPlexTSGetGradientDM"
50 /*@C
51   DMPlexTSGetGradientDM - Return gradient data layout
52 
53   Input Parameters:
54 + dm - The DM
55 - fv - The PetscFV
56 
57   Output Parameter:
58 . dmGrad - The layout for gradient values
59 
60   Level: developer
61 
62 .seealso: DMPlexTSGetGeometryFVM(), DMPlexTSSetRHSFunctionLocal()
63 @*/
64 PetscErrorCode DMPlexTSGetGradientDM(DM dm, PetscFV fv, DM *dmGrad)
65 {
66   DMTS           dmts;
67   PetscObject    obj;
68   PetscBool      computeGradients;
69   PetscErrorCode ierr;
70 
71   PetscFunctionBegin;
72   PetscValidHeaderSpecific(dm,DM_CLASSID,1);
73   PetscValidHeaderSpecific(fv,PETSCFV_CLASSID,2);
74   PetscValidPointer(dmGrad,3);
75   ierr = PetscFVGetComputeGradients(fv, &computeGradients);CHKERRQ(ierr);
76   if (!computeGradients) {*dmGrad = NULL; PetscFunctionReturn(0);}
77   ierr = DMGetDMTS(dm, &dmts);CHKERRQ(ierr);
78   ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_dmgrad_fvm", &obj);CHKERRQ(ierr);
79   if (!obj) {
80     DM  dmGrad;
81     Vec faceGeometry, cellGeometry;
82 
83     ierr = DMPlexTSGetGeometryFVM(dm, &faceGeometry, &cellGeometry, NULL);CHKERRQ(ierr);
84     ierr = DMPlexComputeGradientFVM(dm, fv, faceGeometry, cellGeometry, &dmGrad);CHKERRQ(ierr);
85     ierr = PetscObjectCompose((PetscObject) dmts, "DMPlexTS_dmgrad_fvm", (PetscObject) dmGrad);CHKERRQ(ierr);
86     ierr = DMDestroy(&dmGrad);CHKERRQ(ierr);
87   }
88   ierr = PetscObjectQuery((PetscObject) dmts, "DMPlexTS_dmgrad_fvm", (PetscObject *) dmGrad);CHKERRQ(ierr);
89   PetscFunctionReturn(0);
90 }
91 
92 #undef __FUNCT__
93 #define __FUNCT__ "DMPlexTSComputeRHSFunctionFVM"
94 /*@
95   DMPlexTSComputeRHSFunctionFVM - Form the local forcing F from the local input X using pointwise functions specified by the user
96 
97   Input Parameters:
98 + dm - The mesh
99 . t - The time
100 . locX  - Local solution
101 - user - The user context
102 
103   Output Parameter:
104 . F  - Global output vector
105 
106   Level: developer
107 
108 .seealso: DMPlexComputeJacobianActionFEM()
109 @*/
110 PetscErrorCode DMPlexTSComputeRHSFunctionFVM(DM dm, PetscReal time, Vec locX, Vec F, void *user)
111 {
112   Vec            locF;
113   PetscErrorCode ierr;
114 
115   PetscFunctionBegin;
116   ierr = DMGetLocalVector(dm, &locF);CHKERRQ(ierr);
117   ierr = VecZeroEntries(locF);CHKERRQ(ierr);
118   ierr = DMPlexComputeResidual_Internal(dm, time, locX, NULL, locF, user);CHKERRQ(ierr);
119   ierr = DMLocalToGlobalBegin(dm, locF, INSERT_VALUES, F);CHKERRQ(ierr);
120   ierr = DMLocalToGlobalEnd(dm, locF, INSERT_VALUES, F);CHKERRQ(ierr);
121   ierr = DMRestoreLocalVector(dm, &locF);CHKERRQ(ierr);
122   PetscFunctionReturn(0);
123 }
124 
125 #undef __FUNCT__
126 #define __FUNCT__ "DMPlexTSComputeIFunctionFEM"
127 /*@
128   DMPlexTSComputeIFunctionFEM - Form the local residual F from the local input X using pointwise functions specified by the user
129 
130   Input Parameters:
131 + dm - The mesh
132 . t - The time
133 . locX  - Local solution
134 . locX_t - Local solution time derivative, or NULL
135 - user - The user context
136 
137   Output Parameter:
138 . locF  - Local output vector
139 
140   Level: developer
141 
142 .seealso: DMPlexComputeJacobianActionFEM()
143 @*/
144 PetscErrorCode DMPlexTSComputeIFunctionFEM(DM dm, PetscReal time, Vec locX, Vec locX_t, Vec locF, void *user)
145 {
146   PetscErrorCode ierr;
147 
148   PetscFunctionBegin;
149   ierr = DMPlexComputeResidual_Internal(dm, time, locX, locX_t, locF, user);CHKERRQ(ierr);
150   PetscFunctionReturn(0);
151 }
152 
153 #undef __FUNCT__
154 #define __FUNCT__ "DMTSCheckFromOptions"
155 PetscErrorCode DMTSCheckFromOptions(TS ts, Vec u, void (**exactFuncs)(const PetscReal x[], PetscScalar *u, void *ctx), void **ctxs)
156 {
157   DM             dm;
158   SNES           snes;
159   Mat            J, M;
160   Vec            sol, r, b;
161   MatNullSpace   nullSpace;
162   PetscReal     *error, res = 0.0;
163   PetscInt       numFields;
164   PetscBool      check;
165   PetscErrorCode ierr;
166 
167   PetscFunctionBegin;
168   ierr = PetscOptionsHasName(ts->hdr.prefix, "-dmts_check", &check);CHKERRQ(ierr);
169   if (!check) PetscFunctionReturn(0);
170   ierr = TSGetDM(ts, &dm);CHKERRQ(ierr);
171   ierr = VecDuplicate(u, &sol);CHKERRQ(ierr);
172   ierr = VecDuplicate(u, &r);CHKERRQ(ierr);
173   ierr = TSSetSolution(ts, sol);CHKERRQ(ierr);
174   ierr = TSSetUp(ts);CHKERRQ(ierr);
175   ierr = TSGetSNES(ts, &snes);CHKERRQ(ierr);
176   ierr = SNESSetSolution(snes, sol);CHKERRQ(ierr);
177   ierr = DMCreateMatrix(dm, &J);CHKERRQ(ierr);
178   M    = J;
179 #if 0
180   {
181     ierr = CreatePressureNullSpace(dm, user, &nullSpace);CHKERRQ(ierr);
182     ierr = MatSetNullSpace(J, nullSpace);CHKERRQ(ierr);
183     if (M != J) {ierr = MatSetNullSpace(M, nullSpace);CHKERRQ(ierr);}
184   }
185 #endif
186   /* Check discretization error */
187   ierr = DMGetNumFields(dm, &numFields);CHKERRQ(ierr);
188   ierr = PetscMalloc1(PetscMax(1, numFields), &error);CHKERRQ(ierr);
189   if (numFields > 1) {
190     PetscInt f;
191 
192     ierr = DMPlexComputeL2FieldDiff(dm, exactFuncs, ctxs, u, error);CHKERRQ(ierr);
193     ierr = PetscPrintf(PETSC_COMM_WORLD, "L_2 Error: [");CHKERRQ(ierr);
194     for (f = 0; f < numFields; ++f) {
195       if (f) {ierr = PetscPrintf(PETSC_COMM_WORLD, ", ");CHKERRQ(ierr);}
196       if (error[f] >= 1.0e-11) {ierr = PetscPrintf(PETSC_COMM_WORLD, "%g", error[f]);CHKERRQ(ierr);}
197       else                     {ierr = PetscPrintf(PETSC_COMM_WORLD, "< 1.0e-11");CHKERRQ(ierr);}
198     }
199     ierr = PetscPrintf(PETSC_COMM_WORLD, "]\n");CHKERRQ(ierr);
200   } else {
201     ierr = DMPlexComputeL2Diff(dm, exactFuncs, ctxs, u, &error[0]);CHKERRQ(ierr);
202     if (error[0] >= 1.0e-11) {ierr = PetscPrintf(PETSC_COMM_WORLD, "L_2 Error: %g\n", error[0]);CHKERRQ(ierr);}
203     else                     {ierr = PetscPrintf(PETSC_COMM_WORLD, "L_2 Error: < 1.0e-11\n");CHKERRQ(ierr);}
204   }
205   ierr = PetscFree(error);CHKERRQ(ierr);
206   /* Check residual */
207   ierr = SNESComputeFunction(snes, u, r);CHKERRQ(ierr);
208   ierr = VecNorm(r, NORM_2, &res);CHKERRQ(ierr);
209   ierr = PetscPrintf(PETSC_COMM_WORLD, "L_2 Residual: %g\n", res);CHKERRQ(ierr);
210   ierr = VecChop(r, 1.0e-10);CHKERRQ(ierr);
211   ierr = PetscObjectSetName((PetscObject) r, "Initial Residual");CHKERRQ(ierr);
212   ierr = VecViewFromOptions(r, "res_", "-vec_view");CHKERRQ(ierr);
213   /* Check Jacobian */
214   ierr = SNESComputeJacobian(snes, u, M, M);CHKERRQ(ierr);
215   ierr = MatGetNullSpace(J, &nullSpace);CHKERRQ(ierr);
216   if (nullSpace) {
217     PetscBool isNull;
218     ierr = MatNullSpaceTest(nullSpace, J, &isNull);CHKERRQ(ierr);
219     if (!isNull) SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_PLIB, "The null space calculated for the system operator is invalid.");
220   }
221   ierr = VecDuplicate(u, &b);CHKERRQ(ierr);
222   ierr = VecSet(r, 0.0);CHKERRQ(ierr);
223   ierr = SNESComputeFunction(snes, r, b);CHKERRQ(ierr);
224   ierr = MatMult(M, u, r);CHKERRQ(ierr);
225   ierr = VecAXPY(r, 1.0, b);CHKERRQ(ierr);
226   ierr = VecDestroy(&b);CHKERRQ(ierr);
227   ierr = VecNorm(r, NORM_2, &res);CHKERRQ(ierr);
228   ierr = PetscPrintf(PETSC_COMM_WORLD, "Linear L_2 Residual: %g\n", res);CHKERRQ(ierr);
229   ierr = VecChop(r, 1.0e-10);CHKERRQ(ierr);
230   ierr = PetscObjectSetName((PetscObject) r, "Au - b = Au + F(0)");CHKERRQ(ierr);
231   ierr = VecViewFromOptions(r, "linear_res_", "-vec_view");CHKERRQ(ierr);
232   ierr = VecDestroy(&sol);CHKERRQ(ierr);
233   ierr = VecDestroy(&r);CHKERRQ(ierr);
234   ierr = MatNullSpaceDestroy(&nullSpace);CHKERRQ(ierr);
235   ierr = MatDestroy(&J);CHKERRQ(ierr);
236   PetscFunctionReturn(0);
237 }
238