PCBDDCSetDivergenceMat

Sets the linear operator representing \int_\Omega \div {\bf u} \cdot p dx for the PCBDDC preconditioner

Synopsis

#include "petscpc.h" 
PetscErrorCode PCBDDCSetDivergenceMat(PC pc, Mat divudotp, PetscBool trans, IS vl2l)

Collective

Input Parameters

• pc - the preconditioning context

• divudotp - the matrix (must be of type MATIS)

• trans - if PETSC_FALSE (resp. PETSC_TRUE), then pressures are in the test (trial) space and velocities are in the trial (test) space.

• vl2l - optional index set describing the local (wrt the local matrix in divudotp) to local (wrt the local matrix in the preconditioning matrix) map for the velocities

Notes

This auxiliary matrix is used to compute quadrature weights representing the net-flux across subdomain boundaries

If vl2l is NULL, the local ordering for velocities in divudotp should match that of the preconditioning matrix

See Also

PCBDDC, PCBDDCSetDiscreteGradient()

Level

advanced

Location

src/ksp/pc/impls/bddc/bddc.c

Examples

src/ksp/ksp/tutorials/ex43.c

Implementations

PCBDDCSetDivergenceMat_BDDC in src/ksp/pc/impls/bddc/bddc.c

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