COMSOL Multiphysics™

multiphysics
a1.equ.res0 = 1.754e-8
a1.equ.sigtype = 'heat';
a2.mode = 'HeatTransfer';
a2.assignsuffix = '_ht';
a2.bnd.T0 = {300 0};
a2.bnd.type = {'T' 'q0'};
a2.bnd.ind = [1 2 2 1];
a2.equ.rho = 8930;
a2.equ.C = 340;
a2.equ.k = 384;
a2.equ.Q = 'Q_dc';
a2.equ.init = 300;
fem.appl = {a1 a2};
fem = multiphysics(fem);
fem.xmesh=meshextend(fem);
fem.sol = femtime(fem,'tlist',linspace(0,3000,41), ...
'report','on');
Diagnostics
All variables in the appl{:}.dim fields must be unique. If any appl{:}.dim has not
been provided, no other appl{:}.dim may collide with the defaults. If they do, an
error message is generated.
If any form appl{:}.form is more general than Outform, an error message is
generated.
Compatibility
To simplify the output of the multiphysics functions in FEMLAB 3.0, its defaults
has been changed by the introduction of the properties Shrink and Defaults. The
compatibility problems typically occur when you perform changes to the data
generated by multiphysics. For example, modifying the α coefficient
fem=multiphysics(fem);
fem.equ.al{1}{2,1}=...;
fem.equ.al{1}{3,1}=...;
may not work as in FEMLAB 2.3 because alpha is often just empty. The code above
assumes that fem.equ.al{1} is a 3-by-3 cell array. To obtain fully backward
compatible output, use
fem=multiphysics(fem,'shrink','off','defaults','on');
which makes the above example work.
The properties out and rules are obsolete from FEMLAB 3.0.
The property Idl is obsolete in FEMLAB 2.2 and later versions.
The fields fem.init and fem.usage are no longer constructed. They are
superseded by the fields fem.***.init and fem.***.shape, respectively.
310 | CHAPTER 1: COMMAND REFERENCE