COMSOL Multiphysics™

elcplscalar
Purpose
elcplscalar
Define integration coupling variables.
Syntax
Description
el.elem = 'elcplscalar'
el.g{ig} = geomnum
el.var{ivar} = varname
el.global = varlist
el.src{ig}{edim}.ind{srcdomgrp} = domainlist
el.src{ig}{edim}.expr{ivar}{srcdomgrp} = srcexpr
el.src{ig}{edim}.ipoints{ivar}{srcdomgrp} = ip
el.src{ig}{edim}.iorders{ivar}{srcdomgrp} = io
el.src{ig}{edim}.frame{ivar}{srcdomgrp} = frame
el.geomdim{ig}{edim}.ind{eldomgrp} = domainlist
el.geomdim{ig}{edim}.usage{ivar} = eldomgrplist
The elcplscalar element declares the integration coupling variable names listed
in the var field to be accessible on domain groups specified as a, possibly empty, cell
array for each variable in the usage field, or globally if the variable index is
mentioned in the global field. The same variable cannot be defined as both global
and local.
The source domain grouping specified in the src{ig}{edim}.ind field does not
contribute to the global domain splitting. For each variable and source domain
group, a possibly empty (no contribution) source expression is given in the expr
field.
The ipoint field specifies an integration point pattern using indices referring to an
elgpspec element. If the ipoints field is not present, the iorders field will be
read instead and assumed to contain Gauss-Legendre quadrature orders for the
source expressions. When specifying an elcplscalar element in a script, the latter
syntax is more convenient.
The frame field selects the set of spatial variables with reference to which the
integration is performed. For example, if the source expression is '1', using the
reference frame will make the variable evaluate to the undeformed volume of the
source domains, while choosing a moving frame will give you the deformed volume.
Examples
Make the average value of the solution available on the boundary of a circle.
fem.geom = circ2;
fem.mesh = meshinit(fem);
fem.shape = 2;
fem.equ.c = 1; fem.equ.f = 1;
fem.bnd.h = 1;
fem.elem = {};
clear el;
66 | CHAPTER 1: COMMAND REFERENCE