COMSOL Multiphysics™

femsolver
PROPERTIES CORRESPONDING TO THE SOLVER MANAGER
The properties Init, U, Solcomp, and Outcomp correspond to settings in the Solver
Manager (see “Working with the Solver Manager” on page 444 in the COMSOL
Multiphysics User’s Guide).
The property Init determines the initial value for the solution components you
solve for. For possible syntaxes, see asseminit. If you omit this property, the solver
computes the initial value by evaluating the initial value expressions in
fem.equ.init, fem.equ.dinit, fem.bnd.init, fem.bnd.dinit, etc. If any of
these expressions depend on a solution component, the value 0 is used for that
solution component.
The property U determines the value of solution component you do not solve for
and the linearization point. A scalar value is equivalent to a solution vector
containing that value in all its components.
The property Solcomp is a cell array containing the names of the degrees of freedom
to solve for. The default is all degrees of freedom.
The property Outcomp is a cell array containing the names of the degrees of freedom
to store in the output solution object. If the solution is time dependent, the
property Outcomp can contain also the time derivatives of the DOF names. The
default is all degrees of freedom (excluding the time derivatives).
THE PROGRESS WINDOW
By default, a progress window appears when a solver is called. This is similar to the
progress window that appears in the COMSOL Multiphysics user interface (see
“Solution Progress” on page 456 in the COMSOL Multiphysics User’s Guide). The
progress window gives you the possibility to cancel or stop the solver. Also, when
running in MATLAB, it gives you the possibility to examine the convergence in a
plot. Using the properties specified under Probe Plot Parameters below, in addition,
the progress window gives you the possibility to plot values of certain quantities
during the solution process for the time dependent and parametric solver. If you do
not want the progress window, use the Report property or the flreport command
(see flreport).
150 | CHAPTER 1: COMMAND REFERENCE