PetscDSGetBoundary#

Gets a boundary condition to the model

Synopsis#

#include "petscds.h" 
PetscErrorCode PetscDSGetBoundary(PetscDS ds, PetscInt bd, PetscWeakForm *wf, DMBoundaryConditionType *type, const char *name[], DMLabel *label, PetscInt *Nv, const PetscInt *values[], PetscInt *field, PetscInt *Nc, const PetscInt *comps[], void (**func)(void), void (**func_t)(void), void **ctx)

Input Parameters#

  • ds - The PetscDS object

  • bd - The BC number

Output Parameters#

  • wf - The PetscWeakForm holding the pointwise functions

  • type - The type of condition, e.g. DM_BC_ESSENTIAL/DM_BC_ESSENTIAL_FIELD (Dirichlet), or DM_BC_NATURAL (Neumann)

  • name - The BC name

  • label - The label defining constrained points

  • Nv - The number of DMLabel ids for constrained points

  • values - An array of ids for constrained points

  • field - The field to constrain

  • Nc - The number of constrained field components

  • comps - An array of constrained component numbers

  • func - A pointwise function giving boundary values

  • func_t - A pointwise function giving the time derivative of the boundary values

  • ctx - An optional user context for bcFunc

Options Database Keys#

  • -bc_ - Overrides the boundary ids

  • -bc__comp - Overrides the boundary components

See Also#

PetscDS, PetscWeakForm, DMBoundaryConditionType, PetscDSAddBoundary(), DMLabel

Level#

developer

Location#

src/dm/dt/interface/dtds.c

Examples#

src/snes/tutorials/ex12.c
src/snes/tutorials/ex17.c
src/ts/tutorials/ex76.c
src/snes/tutorials/ex71.c
src/ts/tutorials/ex53.c
src/snes/tutorials/ex56.c
src/snes/tutorials/ex77.c
src/snes/tutorials/ex24.c


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