1: #pragma once

  3: /* SUBMANSEC = DM */

  5: /*S
  6:      DM - Abstract PETSc object that manages an abstract grid-like object and its interactions with the algebraic solvers

  8:    Level: intermediate

 10: .seealso: [](ch_dmbase), `DMType`, `DMGetType()`, `DMCompositeCreate()`, `DMDACreate()`, `DMSetType()`, `DMType`, `DMDA`, `DMPLEX`
 11: S*/
 12: typedef struct _p_DM *DM;

 14: /*E
 15:   DMBoundaryType - Describes the choice for the filling of ghost cells on physical domain boundaries.

 17:   Values:
 18: + `DM_BOUNDARY_NONE`     - no ghost nodes
 19: . `DM_BOUNDARY_GHOSTED`  - ghost vertices/cells exist but aren't filled; you can put values into them and then apply a stencil that uses those ghost locations
 20: . `DM_BOUNDARY_MIRROR`   - the ghost value is the same as the value 1 grid point in; that is, the 0th grid point in the real mesh acts like a mirror to define
 21:                            the ghost point value; not yet implemented for 3d
 22: . `DM_BOUNDARY_PERIODIC` - ghost vertices/cells filled by the opposite edge of the domain
 23: - `DM_BOUNDARY_TWIST`    - like periodic, only glued backwards like a Mobius strip

 25:   Level: beginner

 27:   Notes:
 28:   This is information for the boundary of the __PHYSICAL__ domain. It has nothing to do with boundaries between
 29:   processes. That width is always determined by the stencil width; see `DMDASetStencilWidth()`.

 31:   If the physical grid points have values 0 1 2 3 with `DM_BOUNDARY_MIRROR` then the local vector with ghost points has the values 1 0 1 2 3 2.

 33:   See <https://scicomp.stackexchange.com/questions/5355/writing-the-poisson-equation-finite-difference-matrix-with-neumann-boundary-cond>

 35:   Developer Note:
 36:   Should `DM_BOUNDARY_MIRROR` have the same meaning with `DMDA_Q0`, that is a staggered grid? In that case should the ghost point have the same value
 37:   as the 0th grid point where the physical boundary serves as the mirror?

 39: .seealso: [](ch_dmbase), `DM`, `DMDA`, `DMDASetBoundaryType()`, `DMDACreate1d()`, `DMDACreate2d()`, `DMDACreate3d()`, `DMDACreate()`
 40: E*/
 41: typedef enum {
 42:   DM_BOUNDARY_NONE,
 43:   DM_BOUNDARY_GHOSTED,
 44:   DM_BOUNDARY_MIRROR,
 45:   DM_BOUNDARY_PERIODIC,
 46:   DM_BOUNDARY_TWIST
 47: } DMBoundaryType;

 49: /*E
 50:   DMBoundaryConditionType - indicates what type of boundary condition is to be imposed

 52:   Values:
 53: + `DM_BC_ESSENTIAL`          - A Dirichlet condition using a function of the coordinates
 54: . `DM_BC_ESSENTIAL_FIELD`    - A Dirichlet condition using a function of the coordinates and auxiliary field data
 55: . `DM_BC_ESSENTIAL_BD_FIELD` - A Dirichlet condition using a function of the coordinates, facet normal, and auxiliary field data
 56: . `DM_BC_NATURAL`            - A Neumann condition using a function of the coordinates
 57: . `DM_BC_NATURAL_FIELD`      - A Neumann condition using a function of the coordinates and auxiliary field data
 58: - `DM_BC_NATURAL_RIEMANN`    - A flux condition which determines the state in ghost cells

 60:   Level: beginner

 62:   Note:
 63:   The user can check whether a boundary condition is essential using (type & `DM_BC_ESSENTIAL`), and similarly for
 64:   natural conditions (type & `DM_BC_NATURAL`)

 66: .seealso: [](ch_dmbase), `DM`, `DMAddBoundary()`, `DSAddBoundary()`, `DSGetBoundary()`
 67: E*/
 68: typedef enum {
 69:   DM_BC_ESSENTIAL          = 1,
 70:   DM_BC_ESSENTIAL_FIELD    = 5,
 71:   DM_BC_NATURAL            = 2,
 72:   DM_BC_NATURAL_FIELD      = 6,
 73:   DM_BC_ESSENTIAL_BD_FIELD = 9,
 74:   DM_BC_NATURAL_RIEMANN    = 10
 75: } DMBoundaryConditionType;

 77: /*E
 78:   DMPointLocationType - Describes the method to handle point location failure

 80:   Values:
 81: +  `DM_POINTLOCATION_NONE`    - return a negative cell number
 82: .  `DM_POINTLOCATION_NEAREST` - the (approximate) nearest point in the mesh is used
 83: -  `DM_POINTLOCATION_REMOVE`  - returns values only for points which were located

 85:   Level: intermediate

 87: .seealso: [](ch_dmbase), `DM`, `DMLocatePoints()`
 88: E*/
 89: typedef enum {
 90:   DM_POINTLOCATION_NONE,
 91:   DM_POINTLOCATION_NEAREST,
 92:   DM_POINTLOCATION_REMOVE
 93: } DMPointLocationType;

 95: /*E
 96:   DMBlockingType - Describes how to choose variable block sizes

 98:   Values:
 99: +  `DM_BLOCKING_TOPOLOGICAL_POINT` - select all fields at a topological point (cell center, at a face, etc)
100: -  `DM_BLOCKING_FIELD_NODE`        - using a separate block for each field at a topological point

102:   Level: intermediate

104:   Note:
105:   When using `PCVPBJACOBI`, one can choose to block by topological point (all fields at a cell center, at a face, etc.)
106:   or by field nodes (using number of components per field to identify "nodes"). Field nodes lead to smaller blocks, but
107:   may converge more slowly. For example, a cubic Lagrange hexahedron will have one node at vertices, two at edges, four
108:   at faces, and eight at cell centers. If using point blocking, the `PCVPBJACOBI` preconditioner will work with block
109:   sizes up to 8 Lagrange nodes. For 5-component CFD, this produces matrices up to 40x40, which increases memory
110:   footprint and may harm performance. With field node blocking, the maximum block size will correspond to one Lagrange node,
111:   or 5x5 blocks for the CFD example.

113: .seealso: [](ch_dmbase), `PCVPBJACOBI`, `MatSetVariableBlockSizes()`, `DMSetBlockingType()`
114: E*/
115: typedef enum {
116:   DM_BLOCKING_TOPOLOGICAL_POINT,
117:   DM_BLOCKING_FIELD_NODE
118: } DMBlockingType;

120: /*E
121:   DMAdaptationStrategy - Describes the strategy used for adaptive solves

123:   Values:
124: +  `DM_ADAPTATION_INITIAL`    - refine a mesh based on an initial guess
125: .  `DM_ADAPTATION_SEQUENTIAL` - refine the mesh based on a sequence of solves, much like grid sequencing
126: -  `DM_ADAPTATION_MULTILEVEL` - use the sequence of constructed meshes in a multilevel solve, much like the Systematic Upscaling of Brandt

128:   Level: beginner

130: .seealso: [](ch_dmbase), `DM`, `DMAdaptor`, `DMAdaptationCriterion`, `DMAdaptorSolve()`
131: E*/
132: typedef enum {
133:   DM_ADAPTATION_INITIAL,
134:   DM_ADAPTATION_SEQUENTIAL,
135:   DM_ADAPTATION_MULTILEVEL
136: } DMAdaptationStrategy;

138: /*E
139:   DMAdaptationCriterion - Describes the test used to decide whether to coarsen or refine parts of the mesh

141:   Values:
142: + `DM_ADAPTATION_REFINE` - uniformly refine a mesh, much like grid sequencing
143: . `DM_ADAPTATION_LABEL`  - adapt the mesh based upon a label of the cells filled with `DMAdaptFlag` markers.
144: . `DM_ADAPTATION_METRIC` - try to mesh the manifold described by the input metric tensor uniformly. PETSc can also construct such a metric based
145:                            upon an input primal or a gradient field.
146: - `DM_ADAPTATION_NONE`   - do no adaptation

148:   Level: beginner

150: .seealso: [](ch_dmbase), `DM`, `DMAdaptor`, `DMAdaptationStrategy`, `DMAdaptorSolve()`
151: E*/
152: typedef enum {
153:   DM_ADAPTATION_NONE,
154:   DM_ADAPTATION_REFINE,
155:   DM_ADAPTATION_LABEL,
156:   DM_ADAPTATION_METRIC
157: } DMAdaptationCriterion;

159: /*E
160:   DMAdaptFlag - Marker in the label prescribing what adaptation to perform

162:   Values:
163: +  `DM_ADAPT_DETERMINE`    - undocumented
164: .  `DM_ADAPT_KEEP`         - undocumented
165: .  `DM_ADAPT_REFINE`       - undocumented
166: .  `DM_ADAPT_COARSEN`      - undocumented
167: -  `DM_ADAPT_COARSEN_LAST` - undocumented

169:   Level: beginner

171: .seealso: [](ch_dmbase), `DM`, `DMAdaptor`, `DMAdaptationStrategy`, `DMAdaptationCriterion`, `DMAdaptorSolve()`, `DMAdaptLabel()`
172: E*/
173: typedef enum {
174:   DM_ADAPT_DETERMINE = PETSC_DETERMINE,
175:   DM_ADAPT_KEEP      = 0,
176:   DM_ADAPT_REFINE,
177:   DM_ADAPT_COARSEN,
178:   DM_ADAPT_COARSEN_LAST,
179:   DM_ADAPT_RESERVED_COUNT
180: } DMAdaptFlag;

182: /*E
183:   DMDirection - Indicates a coordinate direction

185:    Values:
186: +  `DM_X` - the x coordinate direction
187: .  `DM_Y` - the y coordinate direction
188: -  `DM_Z` - the z coordinate direction

190:   Level: beginner

192: .seealso: [](ch_dmbase), `DM`, `DMDA`, `DMDAGetRay()`, `DMDAGetProcessorSubset()`, `DMPlexShearGeometry()`
193: E*/
194: typedef enum {
195:   DM_X,
196:   DM_Y,
197:   DM_Z
198: } DMDirection;

200: /*E
201:   DMEnclosureType - The type of enclosure relation between one `DM` and another

203:    Values:
204: +  `DM_ENC_SUBMESH`   - the `DM` is the boundary of another `DM`
205: .  `DM_ENC_SUPERMESH` - the `DM` has the boundary of another `DM` (the reverse situation to `DM_ENC_SUBMESH`)
206: .  `DM_ENC_EQUALITY`  - it is unknown what this means
207: .  `DM_ENC_NONE`      - no relationship can be determined
208: -  `DM_ENC_UNKNOWN`   - the relationship is unknown

210:   Level: beginner

212: .seealso: [](ch_dmbase), `DM`, `DMGetEnclosureRelation()`
213: E*/
214: typedef enum {
215:   DM_ENC_EQUALITY,
216:   DM_ENC_SUPERMESH,
217:   DM_ENC_SUBMESH,
218:   DM_ENC_NONE,
219:   DM_ENC_UNKNOWN
220: } DMEnclosureType;

222: /*E
223:   DMPolytopeType - This describes the polytope represented by each cell.

225:   Level: beginner

227:   While most operations only need the topology information in the `DMPLEX`, we must sometimes have the
228:   user specify a polytope. For instance, when interpolating from a cell-vertex mesh, the type of
229:   polytope can be ambiguous. Also, `DMPLEX` allows different symmetries of a prism cell with the same
230:   constituent points. Normally these types are automatically inferred and the user does not specify
231:   them.

233: .seealso: [](ch_dmbase), `DM`, `DMPlexComputeCellTypes()`
234: E*/
235: typedef enum {
236:   DM_POLYTOPE_POINT,
237:   DM_POLYTOPE_SEGMENT,
238:   DM_POLYTOPE_POINT_PRISM_TENSOR,
239:   DM_POLYTOPE_TRIANGLE,
240:   DM_POLYTOPE_QUADRILATERAL,
241:   DM_POLYTOPE_SEG_PRISM_TENSOR,
242:   DM_POLYTOPE_TETRAHEDRON,
243:   DM_POLYTOPE_HEXAHEDRON,
244:   DM_POLYTOPE_TRI_PRISM,
245:   DM_POLYTOPE_TRI_PRISM_TENSOR,
246:   DM_POLYTOPE_QUAD_PRISM_TENSOR,
247:   DM_POLYTOPE_PYRAMID,
248:   DM_POLYTOPE_FV_GHOST,
249:   DM_POLYTOPE_INTERIOR_GHOST,
250:   DM_POLYTOPE_UNKNOWN,
251:   DM_NUM_POLYTOPES
252: } DMPolytopeType;
253: PETSC_EXTERN const char *const DMPolytopeTypes[];

255: /*E
256:   PetscUnit - The seven fundamental SI units

258:   Level: beginner

260: .seealso: `DMPlexGetScale()`, `DMPlexSetScale()`
261: E*/
262: typedef enum {
263:   PETSC_UNIT_LENGTH,
264:   PETSC_UNIT_MASS,
265:   PETSC_UNIT_TIME,
266:   PETSC_UNIT_CURRENT,
267:   PETSC_UNIT_TEMPERATURE,
268:   PETSC_UNIT_AMOUNT,
269:   PETSC_UNIT_LUMINOSITY,
270:   NUM_PETSC_UNITS
271: } PetscUnit;

273: /*S
274:     DMField - PETSc object for defining a field on a mesh topology

276:     Level: intermediate

278: .seealso: [](ch_dmbase), `DM`, `DMUniversalLabel`, `DMLabelCreate()`
279: S*/
280: typedef struct _p_DMField *DMField;

282: /*S
283:     DMUniversalLabel - A label that encodes a set of `DMLabel`s, bijectively

285:     Level: developer

287: .seealso: [](ch_dmbase), `DM`, `DMLabel`, `DMUniversalLabelCreate()`
288: S*/
289: typedef struct _p_UniversalLabel *DMUniversalLabel;

291: typedef struct _PETSc_DMCEED *DMCeed;

293: typedef struct _n_DMGeneratorFunctionList *DMGeneratorFunctionList;