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: /*S
113:   PetscPartitioner - PETSc object that manages a graph partitioner

115:   Level: intermediate

117: .seealso: PetscPartitionerCreate(), PetscPartitionerSetType(), PetscPartitionerType
118: S*/
119: typedef struct _p_PetscPartitioner *PetscPartitioner;

121: /*E
122:   PetscUnit - The seven fundamental SI units

124:   Level: beginner

126: .seealso: DMPlexGetScale(), DMPlexSetScale()
127: E*/
128: 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;

130: /*S
131:     DMField - PETSc object for defining a field on a mesh topology

133:     Level: intermediate
134: S*/
135: typedef struct _p_DMField* DMField;

137: #endif