petsc-3.5.1 2014-07-24
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SNESLineSearchPreCheckPicard

Implements a correction that is sometimes useful to improve the convergence rate of Picard iteration

Synopsis

#include "petscsnes.h" 
PetscErrorCode SNESLineSearchPreCheckPicard(SNESLineSearch linesearch,Vec X,Vec Y,PetscBool *changed,void *ctx)
Logically Collective on SNESLineSearch

Input Arguments

Output Arguments

linesearch - linesearch context
X - base state for this step
Y - initial correction
Y - correction, possibly modified
changed - flag indicating that Y was modified

Options Database Key

-snes_linesearch_precheck_picard - activate this routine
-snes_linesearch_precheck_picard_angle - angle

Notes

This function should be passed to SNESLineSearchSetPreCheck()

The justification for this method involves the linear convergence of a Picard iteration so the Picard linearization should be provided in place of the "Jacobian". This correction is generally not useful when using a Newton linearization.

Reference

Hindmarsh and Payne (1996) Time step limits for stable solutions of the ice sheet equation, Annals of Glaciology.

See Also

SNESLineSearchSetPreCheck()

Level:advanced
Location:
src/snes/linesearch/interface/linesearch.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/snes/examples/tutorials/ex15.c.html