COMSOL Multiphysics™

elvar
Purpose
elvar
Define expression variables.
Syntax
Description
Examples
el.elem = 'elvar'
el.g{'ig'} = geomnum
el.geomdim{ig}{edim}.ind{eldomgrp} = domainlist
el.geomdim{ig}{edim}.var{2*ivar-1} = varname
el.geomdim{ig}{edim}.var{2*ivar}{eldomgrp} = varexpr
The elvar element declares expression variables varname to be accessible on
domain groups for which the defining expression varexpr is non-empty. For the
syntax of the ind field, see elempty.
Redefine the space derivatives of u on an interior boundary to be evaluated on the
“up” side instead of being averaged.
clear fem;
fem.geom = geomcsg({rect2(1,1,'pos',[-1 0]),rect2});
fem.mesh = meshinit(fem);
fem.equ.ind = [1 2];
fem.equ.c = {1 2};
fem.bnd.ind = [1 0 0 0 0 0 2];
fem.bnd.h = 1;
fem.bnd.r = {0 1};
fem.elem = {};
clear el;
el.elem = 'elvar';
el.g = {'1'};
clear gd;
gd.ind = {{'4'}};
gd.var = {'ux',{'up(ux)'},'uy',{'up(uy'}};
el.geomdim{1} = {{},gd,{}};
fem.elem = [fem.elem {el}];
fem.xmesh = meshextend(fem);
fem.sol = femstatic(fem);
postplot(fem,'lindata','ux','linz','ux');
See Also
elempty
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