Date: 2021-03-03T22:26:45+00:00

Actual source code: petscdmtypes.h
petsc-3.14.5 2021-03-03
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      1: #if !defined(PETSCDMTYPES_H)
      2: #define PETSCDMTYPES_H

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

      7:    Level: intermediate

      9:    Notes:
     10:     The DMDACreate() based object and the DMCompositeCreate() based object are examples of DMs

     12: .seealso:  DMCompositeCreate(), DMDACreate(), DMSetType(), DMType
     13: S*/
     14: typedef struct _p_DM* DM;

     16: /*E
     17:   DMBoundaryType - Describes the choice for fill of ghost cells on physical domain boundaries.

     19:   Level: beginner

     21:   A boundary may be of type DM_BOUNDARY_NONE (no ghost nodes), DM_BOUNDARY_GHOSTED (ghost vertices/cells
     22:   exist but aren't filled; you can put values into them and then apply a stencil that uses those ghost locations),
     23:   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 the ghost point value;
     24:   not yet implemented for 3d), DM_BOUNDARY_PERIODIC (ghost vertices/cells filled by the opposite
     25:   edge of the domain), or DM_BOUNDARY_TWIST (like periodic, only glued backwards like a Mobius strip).

     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:   Developer Notes:
     34:     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
     35:   as the 0th grid point where the physical boundary serves as the mirror?

     37:   References:
     38:   https://scicomp.stackexchange.com/questions/5355/writing-the-poisson-equation-finite-difference-matrix-with-neumann-boundary-cond

     40: .seealso: DMDASetBoundaryType(), DMDACreate1d(), DMDACreate2d(), DMDACreate3d(), DMDACreate()
     41: E*/
     42: typedef enum {DM_BOUNDARY_NONE, DM_BOUNDARY_GHOSTED, DM_BOUNDARY_MIRROR, DM_BOUNDARY_PERIODIC, DM_BOUNDARY_TWIST} DMBoundaryType;
     43: /*E
     44:   DMBoundaryConditionType - indicates what type of boundary condition is to be imposed

     46:   Note: This flag indicates the type of function which will define the condition:
     47: $ DM_BC_ESSENTIAL       - A Dirichlet condition using a function of the coordinates
     48: $ DM_BC_ESSENTIAL_FIELD - A Dirichlet condition using a function of the coordinates and auxiliary field data
     49: $ DM_BC_ESSENTIAL_BD_FIELD - A Dirichlet condition using a function of the coordinates, facet normal, and auxiliary field data
     50: $ DM_BC_NATURAL         - A Neumann condition using a function of the coordinates
     51: $ DM_BC_NATURAL_FIELD   - A Neumann condition using a function of the coordinates and auxiliary field data
     52: $ DM_BC_NATURAL_RIEMANN - A flux condition which determines the state in ghost cells
     53: The user can check whether a boundary condition is essential using (type & DM_BC_ESSENTIAL), and similarly for
     54: natural conditions (type & DM_BC_NATURAL)

     56:   Level: beginner

     58: .seealso: DMAddBoundary(), DMGetBoundary()
     59: E*/
     60: typedef enum {DM_BC_ESSENTIAL = 1, DM_BC_ESSENTIAL_FIELD = 5, DM_BC_NATURAL = 2, DM_BC_NATURAL_FIELD = 6, DM_BC_ESSENTIAL_BD_FIELD = 9, DM_BC_NATURAL_RIEMANN = 10} DMBoundaryConditionType;

     62: /*E
     63:   DMPointLocationType - Describes the method to handle point location failure

     65:   Level: beginner

     67:   If a search using DM_POINTLOCATION_NONE fails, the failure is signaled with a negative cell number. On the
     68:   other hand, if DM_POINTLOCATION_NEAREST is used, on failure, the (approximate) nearest point in the mesh is
     69:   used, replacing the given point in the input vector. DM_POINTLOCATION_REMOVE returns values only for points
     70:   which were located.

     72: .seealso: DMLocatePoints()
     73: E*/
     74: typedef enum {DM_POINTLOCATION_NONE, DM_POINTLOCATION_NEAREST, DM_POINTLOCATION_REMOVE} DMPointLocationType;

     76: /*E
     77:   DMAdaptationStrategy - Describes the strategy used for adaptive solves

     79:   Level: beginner

     81:   DM_ADAPTATION_INITIAL will refine a mesh based on an initial guess. DM_ADAPTATION_SEQUENTIAL will refine the
     82:   mesh based on a sequence of solves, much like grid sequencing. DM_ADAPTATION_MULTILEVEL will use the sequence
     83:   of constructed meshes in a multilevel solve, much like the Systematic Upscaling of Brandt.

     85: .seealso: DMAdaptorSolve()
     86: E*/
     87: typedef enum {DM_ADAPTATION_INITIAL, DM_ADAPTATION_SEQUENTIAL, DM_ADAPTATION_MULTILEVEL} DMAdaptationStrategy;

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

     92:   Level: beginner

     94:   DM_ADAPTATION_REFINE will uniformly refine a mesh, much like grid sequencing. DM_ADAPTATION_LABEL will adapt
     95:   the mesh based upon a label of the cells filled with DMAdaptFlag markers. DM_ADAPTATION_METRIC will try to
     96:   mesh the manifold described by the input metric tensor uniformly. PETSc can also construct such a metric based
     97:   upon an input primal or a gradient field.

     99: .seealso: DMAdaptorSolve()
    100: E*/
    101: typedef enum {DM_ADAPTATION_NONE, DM_ADAPTATION_REFINE, DM_ADAPTATION_LABEL, DM_ADAPTATION_METRIC} DMAdaptationCriterion;

    103: /*E
    104:   DMAdaptFlag - Marker in the label prescribing adaptation

    106:   Level: beginner

    108: .seealso: DMAdaptLabel()
    109: E*/
    110: typedef enum {DM_ADAPT_DETERMINE = PETSC_DETERMINE, DM_ADAPT_KEEP = 0, DM_ADAPT_REFINE, DM_ADAPT_COARSEN, DM_ADAPT_COARSEN_LAST, DM_ADAPT_RESERVED_COUNT} DMAdaptFlag;

    112: /*E
    113:   DMDirection - Indicates a coordinate direction

    115:   Level: beginner

    117: .seealso: DMDAGetRay(), DMDAGetProcessorSubset(), DMPlexShearGeometry()
    118: E*/
    119: typedef enum {DM_X, DM_Y, DM_Z} DMDirection;

    121: /*E
    122: DMEnclosureType - The type of enclosure relation between one DM and another

    124: Level: beginner

    126: For example, one DM dmA may be the boundary of another dmB, in which case it would be labeled DM_ENC_SUBMESH. If
    127: the situation is reversed, and dmA has boundary dmB, it would be labeled DM_ENC_SUPERMESH. Likewise, if dmA was
    128: a subregion of dmB, it would be labeled DM_ENC_SUBMESH. If no relation can be determined, DM_ENC_NONE is used.
    129: If a relation is not yet known, then DM_ENC_UNKNOWN is used.

    131: .seealso: DMGetEnclosureRelation()
    132: E*/
    133: typedef enum {DM_ENC_EQUALITY, DM_ENC_SUPERMESH, DM_ENC_SUBMESH, DM_ENC_NONE, DM_ENC_UNKNOWN} DMEnclosureType;

    135: /*E
    136:   DMPolytopeType - This describes the polytope represented by each cell.

    138:   Level: beginner

    140:   While most operations only need the topology information in the Plex, we must sometimes have the
    141:   user specify a polytope. For instance, when interpolating from a cell-vertex mesh, the type of
    142:   polytope can be ambiguous. Also, Plex allows different symmetries of prism cell with the same
    143:   constituent points. Normally these types are autoamtically inferred and the user does not specify
    144:   them.

    146: .seealso: DMPlexComputeCellTypes()
    147: E*/
    148: typedef enum {DM_POLYTOPE_POINT, DM_POLYTOPE_SEGMENT, DM_POLYTOPE_POINT_PRISM_TENSOR, DM_POLYTOPE_TRIANGLE, DM_POLYTOPE_QUADRILATERAL, DM_POLYTOPE_SEG_PRISM_TENSOR, DM_POLYTOPE_TETRAHEDRON, DM_POLYTOPE_HEXAHEDRON, DM_POLYTOPE_TRI_PRISM, DM_POLYTOPE_TRI_PRISM_TENSOR, DM_POLYTOPE_QUAD_PRISM_TENSOR, DM_POLYTOPE_FV_GHOST, DM_POLYTOPE_INTERIOR_GHOST, DM_POLYTOPE_UNKNOWN, DM_NUM_POLYTOPES} DMPolytopeType;
    149: PETSC_EXTERN const char *const DMPolytopeTypes[];

    151: /*E
    152:   PetscUnit - The seven fundamental SI units

    154:   Level: beginner

    156: .seealso: DMPlexGetScale(), DMPlexSetScale()
    157: E*/
    158: typedef enum {PETSC_UNIT_LENGTH, PETSC_UNIT_MASS, PETSC_UNIT_TIME, PETSC_UNIT_CURRENT, PETSC_UNIT_TEMPERATURE, PETSC_UNIT_AMOUNT, PETSC_UNIT_LUMINOSITY, NUM_PETSC_UNITS} PetscUnit;

    160: /*S
    161:     DMField - PETSc object for defining a field on a mesh topology

    163:     Level: intermediate
    164: S*/
    165: typedef struct _p_DMField* DMField;

    167: #endif