COMSOL Multiphysics™

elsconstr
vector. The normal component of this vector is constrained to be zero in the node
points for the shdiv shape function.
Example
Impose a constraint on a vector field E represented using shcurl shape functions of
order 2. The constraint is that the tangential component of E-(2,3) is zero.
clear fem;
fem.geom = circ2;
fem.mesh = meshinit(fem);
fem.shape = 'shcurl(2,''E'')';
fem.dim = {'EX' 'Ey'};
fem.equ.weak = '-(Ex*Ex_test+Ey*Ey_test+dExy_test*dExy)';
clear el gd;
el.elem = 'elsconstr';
el.g = {'1'};
gd.ind = {{'1','2','3','4'}};
gd.shelem{1}{1} = ...
{'s(1)','shcurl',struct('fieldname','E','order','2')};
gd.constr{1}{1} = {'Ex-2','Ey-3'};
gd.cshape{1}{1} = '1';
el.geomdim{1} = {{},gd,{}};
fem.elem = {el};
fem.xmesh = meshextend(fem);
fem.sol = femstatic(fem);
postarrow(fem,{'Ex' 'Ey'});
See Also
elempty, elpconstr, elshape, shdiv, shlag, shcurl
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