petsc-3.14.6 2021-03-30
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Change a boundary condition for the model. The pointwise functions are used to provide boundary values for essential boundary conditions. In FEM, they are acting upon by dual basis functionals to generate FEM coefficients which are fixed. Natural boundary conditions signal to PETSc that boundary integrals should be performaed, using the kernels from PetscDSSetBdResidual().


#include "petscds.h" 
PetscErrorCode PetscDSUpdateBoundary(PetscDS ds, PetscInt bd, DMBoundaryConditionType type, const char name[], const char labelname[], PetscInt field, PetscInt numcomps, const PetscInt *comps, void (*bcFunc)(void), void (*bcFunc_t)(void), PetscInt numids, const PetscInt *ids, void *ctx)

Input Parameters

ds - The PetscDS object
bd - The boundary condition number
type - The type of condition, e.g. DM_BC_ESSENTIAL/DM_BC_ESSENTIAL_FIELD (Dirichlet), or DM_BC_NATURAL (Neumann)
name - The BC name
labelname - The label defining constrained points
field - The field to constrain
numcomps - The number of constrained field components
comps - An array of constrained component numbers
bcFunc - A pointwise function giving boundary values
bcFunc_t - A pointwise function giving the time derviative of the boundary values, or NULL
numids - The number of DMLabel ids for constrained points
ids - An array of ids for constrained points
ctx - An optional user context for bcFunc


The boundary condition number is the order in which it was registered. The user can get the number of boundary conditions from PetscDSGetNumBoundary(). See PetscDSAddBoundary() for a description of the calling sequences for the callbacks.

See Also

PetscDSAddBoundary(), PetscDSGetBoundary(), PetscDSGetNumBoundary()




Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages