COMSOL Multiphysics™

elepspec
Purpose
elepspec
Declare constraint point patterns.
Syntax
el.elem = 'elepspec'
el.g{ig} = geomnum
el.geom{ig}.ep = meshcases | patterns
meshcases.default = patterns
meshcases.case{elmcase} = patterns
meshcases.mind{elmcase} = caselist
patterns{iptrn} = lagorder | ptrnlist
ptrnlist{2*itype-1} = bmtypename
ptrnlist{2*itype} = lagorder | ptrn
ptrn{ipnt} = lcoords
Description
The elepspec element defines local evaluation point patterns typically used for
pointwise constraints. In contrast to most elements, the elepspec does not have a
geomdim field. The geom field has one entry per geometry listed in the g field and
one subfield, ep, which lists a number of patterns that other elements refer to by
position.
If there are no alternate mesh cases specified, each entry in the ep field is either an
integral number, which is interpreted as a Lagrange point order to be used on all
basic mesh element types and dimensions, or a cell array of pairs of basic mesh
element type and a Lagrange order or an explicit pattern. For a list of basic mesh
element type names, see elshape. Explicit patterns are cell arrays of points in the
local coordinate system on each element, each point being a cell array of the same
dimension as the basic mesh element type.
If there are multiple mesh cases present in the model, the ep field is a struct with
fields default, case, and mind. The default field has the same syntax as described
above for the ep field itself. Multiple alternate cases which need the same evaluation
point patterns can be grouped together using the mind field. This field is a cell array
containing groups of mesh case numbers, each group, caselist, given as a cell
array. For each element mesh case group, elmcase, an alternate pattern specification
is given in the case field.
Cautionary
Currently, there can only be one elepspec element for each geometry, which is
generated by default when converting the standard syntax. Therefore, no additional
elepspec can be added in the fem.elem field unless meshextend is called with
property standard set to off.
72 | CHAPTER 1: COMMAND REFERENCE