COMSOL Multiphysics™

femsolver
Equations” on page 440 in the COMSOL Multiphysics User’s Guide. The possible
values are:
TABLE 1-31: VALUES FOR THE PROPERTY USCALE
VALUE
auto
init
none
cell array
solution
vector
MEANING
The scaling is automatically determined.
The scaling is determined from the initial value. Use this if the sizes
of the components of the initial value give a good estimate of the
order of magnitude of the solution.
No scaling is applied.
A cell array with alternating degree of freedom names and positive
numbers. The numbers specify the expected magnitude of the
corresponding degree of freedom.
A numeric vector with positive components that specify the
expected magnitude of the solution.
The default is auto, except when using one of the syntaxes
[Ke,Le,Null,ud] = femstatic(fem,...)
[Kl,Ll,Nnp] = femstatic(fem,...)
[Ks,Ls] = femstatic(fem,...)
fem.sol = femstatic('In',{'K' K 'L' L 'M' M 'N' N},...)
which assume that the property Out is not given in the first three cases. In these cases
the default is none. The resulting vector of scale factors is contained in the output
variable uscale. The scaling of the degrees of freedom is applied symmetrically to
the Jacobian matrix, that is, both the rows and columns are scaled.
LINEAR SYSTEM SOLVERS
The properties Linsolver, Prefun, Presmooth, Postsmooth, and Csolver select
the linear system solver, preconditioner, presmoother, postsmoother, and coarse
solver, according to the following table.
TABLE 1-32: LINEAR SYSTEM SOLVERS/PRECONDITIONERS/SMOOTHERS
NAME
umfpack
spooles
pardiso
taucs_llt_mf
taucs_ldlt
luinc
ALGORITHM
UMFPACK direct solver
SPOOLES direct solver
PARDISO direct solver
TAUCS direct Cholesky solver
TAUCS direct LDLT solver (not recommended)
Incomplete LU preconditioner
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