COMSOL Multiphysics™

elcurlconstr
Purpose
elcurlconstr
Define constraints compatible with first order vector elements.
Syntax
Description
el.elem = 'elcurlconstr'
el.g{ig} = geomnum
el.geomdim{ig}{edim}.ind{eldomgrp} = domainlist
el.geomdim{ig}{edim}.constr{eldomgrp}{ic} = vconstr
The elcurlconstr element adds constraints on vector expressions, vconstr,
which are given as cell arrays with one entry for each space dimension. The
projection of the vector expression onto element edges is constrained to zero at
element edge center points.
For the syntax of the ind field, see elempty. The constr field has one entry for each
domain group, each being a cell array of vector expressions to be constrained.
Cautionary
Examples
This element is currently tailored to fit the shcurl vector shape functions by
constraining the actual degrees of freedom. Other uses may be possible, but
performance will be unpredictable.
Add a PEC condition on boundaries 1 to 6 in a 3D electromagnetics model.
el.elem = 'elcurlconstr';
el.g = {'1'};
gd.ind = {{'1','2','3','4','5','6'}};
gd.constr = {{{'tEx','tEy','tEz'}}};
el.geomdim{1} = {{},{},gd,{}};
fem.elem = [fem.elem {el}];
When exporting the fem structure from a vector element electromagnetics model,
similar elcurlconstr elements are added to the fem.elemmph field.
See Also
elempty, elpconstr
68 | CHAPTER 1: COMMAND REFERENCE