COMSOL Multiphysics™

elshell_arg2
The displacement fields are most easily defined using 6 separate shlag objects of
order 1.
TABLE 1-1: GLOBAL PROPERTIES OF THE ELSHELL_ARG2 SHELL ELEMENT STRUCTURE
FIELD MEANING SYNTAX DEFAULT
VALUE
elem Shell element name 'elshell_arg2' -
g Geometry index scalar number 1
dim Field variable names for displacements and rotations 1-by-6 cell vector of
strings
equation Affects how matrices are assembled 'static'|'freq'|'
time'|'eigen'
omega Frequency for the 'freq' equation string expression '0'
postname Name that is appended to postprocessing variables string empty
string
-
Material, loads and constraints: The shell described by the elshell_arg2 element
can be considered a collection of discrete, homogenous, flat triangles. The material
properties, including damping factors as well as the element thickness, are taken to
be constant within any triangle. The syntax of the material properties, loads and
constraints is analogous to the syntax of the coefficient form level 1 coefficients. See
further the section “Specifying a Model” in the COMSOL Multiphysics Scripting
Guide. However note that all values as well as expressions must be strings.
TABLE 1-2: BND LEVEL PROPERTIES IN THE ELSHELL_ARG2 SHELL ELEMENT STRUCTURE
FIELD MEANING SYNTAX
E Elasticity modulus / Young’s modulus level 1 coefficient
nu Poisson’s ratio level 1 coefficient
rho Density level 1 coefficient
thickness Shell thickness level 1 coefficient
height Postprocessing level level 1 coefficient
alphadM
Mass damping coefficient (submodes level 1 coefficient
'time' and 'freq' only)
betadK
Stiffness damping coefficient
level 1 coefficient
(submodes 'time' and 'freq' only)
xlocalx, xlocaly, Vector, whose projection on the shell level 1 coefficient
xlocalz
defines the local x direction
nsidex, nsidey, nsidez Direction vector which defines the
“up” side of the shell
level 1 coefficient
110 | CHAPTER 1: COMMAND REFERENCE