COMSOL Multiphysics™

femsim
The names of the input variables are given in the property Input. The default is all
names in fem.const.
The output values are determined by the entries in the Output cell array. Each entry
in this cell array should be a cell array of the following form:
{'expr' xx pvlist}
where 'expr' is an expression, xx is a column vector containing global coordinates,
and pvlist is a (possibly empty) list of property/value pairs (see postinterp). The
function postinterp is used to evaluate the output value as
postinterp('expr', xx, pvlist)
The names of the output ports of the COMSOL Multiphysics Subsystem block are
given in the property Outnames. The default names are y1, y2, etc.
The COMSOL Multiphysics Subsystem block can act in four different modes,
chosen by the properties State and Static:
General Dynamic Export (State=off, Static=off)
Export a dynamic model, where the COMSOL Multiphysics degrees of freedom are
part of the Simulink state vector. The COMSOL Multiphysics solver is called several
times for each time step to compute the time derivative of the state vector, with
inputs from Simulink. Only linear, time-independent constraints and the
eliminate constraint handling method is supported. The Itol property is
supported, see femlin. The Const property is not supported.
General Static Export (State=off, Static=on)
Export a static model, where the COMSOL Multiphysics degrees of freedom are
not part of the Simulink state vector. To compute the outputs of the COMSOL
Multiphysics Subsystem block, the COMSOL Multiphysics linear or nonlinear
stationary solver is called for each time step, with inputs from Simulink. If
Nonlin=off, the linear solver is used and the property Itol is supported, see
femlin. If Nonlin=on, the nonlinear solver is used and the properties Hnlin,
Initstep, Maxiter, Minstep, Ntol, and Rstep are supported, see femnlin.
Linearized Dynamic Export (State=on, Static=off)
Export a dynamic linearized model. The model is linearized about an equilibrium
solution, and the matrices in the state-space form are computed. The COMSOL
Multiphysics degrees of freedom are part of the Simulink state vector. At each time
step, the matrices in the state-space form are used to compute the time derivative of
the state vector, instead of calling the COMSOL Multiphysics solver. Only linear,
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