KSPFETIDPSetPressureOperator#

Sets the operator used to set up the pressure preconditioner for the saddle point KSPFETIDP solver,

Synopsis#

#include <petscksp.h> 
PetscErrorCode KSPFETIDPSetPressureOperator(KSP ksp, Mat P)

Collective

Input Parameters#

  • ksp - the KSPFETIDP solver

  • P - the linear operator to be preconditioned, usually the mass matrix.

Notes#

The operator can be either passed in

  a) monolithic global ordering,
  b) pressure-only global ordering, or
  c) interface pressure ordering (if `-ksp_fetidp_pressure_all false`).

In cases b) and c), the pressure ordering of dofs needs to satisfy pid_1 < pid_2 iff gid_1 < gid_2 where pid_1 and pid_2 are two different pressure dof numbers and gid_1 and gid_2 the corresponding id in the monolithic global ordering.

See Also#

KSP: Linear System Solvers, KSPFETIDP, MATIS, PCBDDC, KSPFETIDPGetInnerBDDC(), KSPFETIDPGetInnerKSP(), KSPSetOperators()

Level#

advanced

Location#

src/ksp/ksp/impls/fetidp/fetidp.c

Implementations#

KSPFETIDPSetPressureOperator_FETIDP() in src/ksp/ksp/impls/fetidp/fetidp.c

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