COMSOL Multiphysics™

femnlin
Purpose
femnlin
Solve nonlinear stationary PDE problem.
Syntax
Description
fem.sol = femnlin(fem,...)
fem = femnlin(fem,'Out',{'fem'},...)
fem.sol = femnlin(fem) solves a stationary PDE problem.
fem.sol = femnlin(fem,'pname','P','plist',list,...) solves a stationary
PDE problem for several values of the parameter P. The values of the parameter P
are given in the vector list.
The PDE problem is stored in the (possibly extended) FEM Structure fem. See
femstruct for details.
The solver is an affine invariant form of the damped Newton method. The solver
can optionally be combined with Uzawa iterations, often used to solve problems
with the augmented Lagrangian technique.
The function femnlin accepts the following property/value pairs:
TABLE 1-26: VALID PROPERTY/VALUE PAIRS
PROPERTY VALUE DEFAULT DESCRIPTION
Augcomp cell array of strings Augmented Lagrange
components
Augmaxiter positive integer 25 Max number of
augmentation iterations
Augsolver umfpack | spooles |
taucs_llt_mf |
taucs_ldlt | luinc
umfpack Linear system solver for
augmented Lagrange
components
| taucs_llt | gmres
| cg | amg | gmg |
ssor | ssoru | sor |
soru | jac | lumped
Augtol positive real 1e-6 Tolerance for augmented
Lagrange
Hnlin off | on off Indicator of a highly
nonlinear problem
Initstep non-negative scalar see below Initial damping factor
Keep
string containing K, N
| auto
auto
Parameter and
iteration-independent
quantities
Maxiter positive integer 25 Maximum number of
Newton iterations
135