COMSOL Multiphysics™

elshell_arg2
Purpose
elshell_arg2
Create a linear flat faceted shell element.
Syntax
Description
el.elem = 'elshell_arg2'
el.g{ig} = geomnum
el.dim = depvarnames
el.equation = equation type
el.omega = frequency
el.postname = postfix
el.geomdim{ig}{3}.ind{eldomgrp} = domainlist
el.geomdim{ig}{3}.E{eldomgrp} = E_expr
el.geomdim{ig}{3}.nu{eldomgrp} = nu_expr
el.geomdim{ig}{3}.rho{eldomgrp} = rho_expr
el.geomdim{ig}{3}.thickness{eldomgrp} = th_expr
el.geomdim{ig}{3}.height{eldomgrp} = height_expr
el.geomdim{ig}{3}.alphadM{eldomgrp} = alpha_expr
el.geomdim{ig}{3}.betadK{eldomgrp} = beta_expr
el.geomdim{ig}{3}.xlocalx{eldomgrp} = xlx_expr
el.geomdim{ig}{3}.xlocaly{eldomgrp} = xly_expr
el.geomdim{ig}{3}.xlocalz{eldomgrp} = xlz_expr
el.geomdim{ig}{3}.nsidex{eldomgrp} = nx_expr
el.geomdim{ig}{3}.nsidey{eldomgrp} = ny_expr
el.geomdim{ig}{3}.nsidez{eldomgrp} = nz_expr
The elshell_arg2 element describes a linear Mindlin theory shell made up of
essentially constant-strain triangles with added drilling rotations. The element lives
on a 2D surface embedded in a 3D geometry. Its material properties, constraints
and loads are specified directly in the element syntax structure.
An elshell_arg2 element implements tasks which are handled by an eleqc or
eleqw element when using the standard syntax. That is, it directly assembles
contributions to the stiffness and mass matrices and to the residual vector. In
addition, it defines a number of postprocessing variables. The shell element
structure contains global properties, common to the entire shell, as well as local
material properties on the boundary level. Note that the shell exists only on the
boundary level and below.
Global properties: The equation field specifies whether to treat the problem as
stationary, time harmonic or time-dependent. The three displacement and three
rotation field variable names must be specified in the dim field, for example,
e.dim = {'u','v','w','thx','thy','thz'}
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