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#

KSP: Linear System Solvers, 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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