COMSOL Multiphysics™

elcplextr
Purpose
elcplextr
Define extrusion coupling variables.
Syntax
el.elem = 'elcplextr'
el.g{ig} = geomnum
el.var{ivar} = varname
el.map{imap} = linmap | genmap | unitmap
el.usenan = 'true' | 'false'
el.extttol = tol
el.src{ig}{edim}.ind{srcdomgrp} = domainlist
el.src{ig}{edim}.expr{ivar}{srcdomgrp} = srcexpr
el.src{ig}{edim}.map{ivar}{srcdomgrp} = imap
el.geomdim{ig}{edim}.ind{eldomgrp} = domainlist
el.geomdim{ig}{edim}.map{ivar}{eldomgrp} = imap
linmap.type = 'linear'
linmap.sg = srcig
linmap.sv{ivtx} = srcvtx
linmap.sframe = srcframe
linmap.dg = dstig
linmap.dv{ivtx} = dstvtx
linmap.dframe = dstframe
genmap.type = 'local’
genmap.expr{idim} = transexpr
genmap.frame = frame
unitmap.type = 'unit'
unitmap.frame = frame
Description
The elcplextr element declares the extrusion coupling variable names listed in the
var field to be accessible on domains where the corresponding destination map field
geomdim{ig}{edim}.map{ivar}{eldomgrp} entry is nonempty. Both destination
and source map fields contain indices into the map field which consists of a list of
transformation specifications.
The available transformation types are 'linear', 'local', and 'unit', each with
its own syntax. The unit transformation takes one optional argument specifying
which frame is to be used for evaluating the mesh position. If not given, the
reference frame is assumed. Unit transformations without a frame field actually
never has to be specified explicitly, since using index zero in the source and
destination map fields is interpreted as an implicit unit transformation.
The local transformation, which is called “general” in the COMSOL Multiphysics
user interface, lets you specify an arbitrary expression for each source dimension.
These expressions can contain spatial coordinate variables from any frame. The
frame field decides which frame to use in the search operation when the local
58 | CHAPTER 1: COMMAND REFERENCE