COMSOL Multiphysics™

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elshape fem.geom = circ2; fem.mesh = meshinit(fem); fem.shape = 2; fem.equ.c = 1; fem.equ.f = 1; fem.bnd.weak = 'lm_test*u+lm*u_test'; fem.elem = {}; clear el; el.elem = 'elshape'; el.g = {'1'}; el.tvars = 'off'; gd.ind = {{'1','2','3','4'}}; gd.shelem = ... {{'s(1)','shlag',struct('basename','lm','order','2')}}; el.geomdim{1} = {{},gd,{}}; fem.elem = [fem.elem {el}]; fem.xmesh = meshextend(fem); fem.sol = femstatic(fem); postplot(fem,'tridata','u','triz','u'); See Also elempty, sharg_2_5, shbub, shdens, shdiv, shgp, shlag, shcurl 108 | CHAPTER 1: COMMAND REFERENCE
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'} 109
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COMSOL Multiphysics COMMAND REFERE
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CONTENTS Chapter 1: Command Referen
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femplot . . . . . . . . . . . . . .
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postarrow . . . . . . . . . . . . .
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BSplineSurf . . . . . . . . . . . .
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1 Command Reference 1
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elpconstr on page 99 elplastic on p
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mirror on page 301 move on page 302
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Commands Grouped by Function User I
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Geometry Objects FUNCTION block2 bl
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Mesh Functions FUNCTION femmesh flc
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Postprocessing Functions FUNCTION m
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FUNCTION elmapextr elmesh elode elp
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FUNCTION PURPOSE REPLACEMENT flsdt
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In FEMLAB 3.0, all FEMLAB 2.3 Eleme
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adaption TABLE 1-1: VALID PROPERTY/
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adaption Convergence Control No mor
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adaption fem.bnd.ind = [1 1 2 2 2 2
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adaption The Coefficient residual c
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assemble Purpose assemble Assemble
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assemble matrix contribution (from
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assemble In FEMLAB 2.3, the size of
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asseminit TABLE 1-3: VALID PROPERTY
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lock2, block3 Purpose block2, block
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chamfer Purpose chamfer Create flat
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circ1, circ2 Purpose circ1, circ2 C
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comsol Purpose comsol Start the COM
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cone2, cone3 Cone objects have the
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curve2, curve3 The coercion functio
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cylinder2, cylinder3 TABLE 1-13: CY
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econe2, econe3 Purpose econe2, econ
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elcconstr Purpose elcconstr Define
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elcontact Purpose elcontact Define
Page 67 and 68: elcontact See Also elmapextr 57
Page 69 and 70: elcplextr transformation is used as
Page 71 and 72: elcplgenint Purpose elcplgenint Def
Page 73 and 74: elcplproj Purpose elcplproj Define
Page 75 and 76: elcplproj map1.dg = '1'; map1.dv =
Page 77 and 78: elcplscalar el.elem = 'elcplscalar'
Page 79 and 80: elempty Purpose elempty Define some
Page 81 and 82: elempty clear el; el.elem = 'elempt
Page 83 and 84: elepspec Examples Given a single-ge
Page 85 and 86: eleqc Make sure that the integratio
Page 87 and 88: eleqw fem.elem = [fem.elem {el}]; f
Page 89 and 90: elgeom Purpose elgeom Define geomet
Page 91 and 92: elgpspec elgpspec can be added in t
Page 93 and 94: elinline el.dexpr = {'1/(2*sqrt(a)+
Page 95 and 96: elinterp el.elem = 'elinterp'; el.n
Page 97 and 98: elirradiation Purpose elirradiation
Page 99 and 100: ellip1, ellip2 Purpose ellip1, elli
Page 101 and 102: ellipsoid2, ellipsoid3 Purpose elli
Page 103 and 104: elmapextr Purpose elmapextr Define
Page 105 and 106: elmapextr fem.sol = femeig(fem,'nei
Page 107 and 108: elode Purpose elode Define global s
Page 109 and 110: elpconstr Purpose elpconstr Define
Page 111 and 112: elplastic Purpose elplastic Define
Page 113 and 114: elpric Purpose elpric Define variab
Page 115 and 116: elsconstr vector. The normal compon
Page 117: elshape TABLE 1-20: BASIC MESH ELEM
Page 121 and 122: elshell_arg2 Postprocessing variabl
Page 123 and 124: elvar Purpose elvar Define expressi
Page 125 and 126: extrude Purpose extrude Extrude a 2
Page 127 and 128: face3 Purpose face3 Create 3D surfa
Page 129 and 130: femdiff Purpose femdiff Symbolicall
Page 131 and 132: femeig Purpose femeig Solve eigenva
Page 133 and 134: femeig where Ω is the L-shaped mem
Page 135 and 136: femlin KN T N 0 U - U 0 Λ = L M ,
Page 137 and 138: femlin nullfun and symmetric can be
Page 139 and 140: femmesh Purpose femmesh Create a me
Page 141 and 142: femmesh Tetrahedral element (tet):
Page 143 and 144: femmesh FACE (EDGE NODES) FACE MID
Page 145 and 146: femnlin Purpose femnlin Solve nonli
Page 147 and 148: femnlin components fixed, the augme
Page 149 and 150: femnlin The property Rstep sets a r
Page 151 and 152: femplot PROPERTY VALUE DEFAULT DESC
Page 153 and 154: femsim The names of the input varia
Page 155 and 156: femsim Most of the FEMLAB 2.3 data
Page 157 and 158: femsol Example Create a solution ob
Page 159 and 160: femsolver TABLE 1-30: COMMON SOLVER
Page 161 and 162: femsolver PROBE PLOT PARAMETERS Pro
Page 163 and 164: femsolver Equations” on page 440
Page 165 and 166: femsolver TABLE 1-33: DIRECT LINEAR
Page 167 and 168: femsolver TABLE 1-34: ITERATIVE LIN
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femsolver scalar Shapechg, and the
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femsolver TABLE 1-36: OBSOLETE PROP
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femstate with the property State=on
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femstatic dependent and if these ma
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femtime Purpose femtime Solve time-
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femtime initial values are consiste
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femtime Cautionary In structural me
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femwave and then transforms the PDE
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femwave Weak coefficients are cell
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fillet Purpose fillet Create circul
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flcontour2mesh Purpose flcontour2me
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flform Purpose flform Convert betwe
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flim2curve Purpose flim2curve Creat
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flload Purpose flload Load a COMSOL
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flmesh2spline figure meshplot(msh)
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flnull Purpose flnull Compute null
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flreport Purpose flreport Globally
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flsmhs, flsmsign, fldsmhs, fldsmsig
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gencyl2, gencyl3 s2 = gencyl2(...)
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geom0, geom1, geom2, geom3 edge is
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geom0, geom1, geom2, geom3 See Also
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geomanalyze % Circle moving through
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geomarrayr The input argument g1, g
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geomcomp Purpose geomcomp Analyze g
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geomcsg g = geomcsg(sl,pl,...) deco
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geomcsg TABLE 1-57: GEOMETRY MODEL
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geomdel Purpose geomdel Delete poin
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geomedit Purpose geomedit Edit geom
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geomfile Purpose geomfile Geometry
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geomfile clear fem fem.geom = 'card
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geomgetwrkpln respect to the face.
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geomgroup Examples See Also [g pair
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geomimport TABLE 1-64: VALID PROPER
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geominfo Out specifies the geometry
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geominfo DD = reshape(ff2{m}(im1,im
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geominfo The following commands, se
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geomobject Purpose geomobject Creat
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geomplot design philosophy has been
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geomplot 2D Example Start by creati
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geomposition Purpose geomposition P
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geomspline p agree to within 1000*e
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getparts Purpose getparts Extract p
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line1, line2 Purpose line1, line2 C
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loft gl{2} and so on. It is require
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loft See Also extrude, geomgetwrkpl
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mesh2geom fem.mesh=meshinit(rect2);
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meshcaseadd The mesh case generatio
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meshdel Purpose meshdel Delete elem
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meshembed Purpose meshembed Embed a
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meshenrich TABLE 1-4: VALID PROPERT
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meshexport Purpose meshexport Expor
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meshextrude Purpose meshextrude Ext
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meshimport Purpose meshimport Impor
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meshimport sum of the coordinates o
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meshinit TABLE 1-8: VALID PROPERTY/
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meshinit TABLE 1-8: VALID PROPERTY/
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meshinit TABLE 1-10: MESH PARAMETER
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meshinit The properties xscale, ysc
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meshintegrate Purpose meshintegrate
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meshmap Purpose meshmap Create mapp
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meshmap HAUTO SCALE FACTOR 3 0.55 4
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meshplot Purpose meshplot Plot mesh
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meshplot TABLE 1-11: VALID PROPERTY
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meshplot The bound property group c
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meshplot See Also femmesh, geomplot
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meshqual Purpose meshqual Mesh qual
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meshrefine Purpose meshrefine Refin
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meshrevolve Purpose meshrevolve Rev
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meshsmooth Purpose meshsmooth Smoot
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meshsweep Purpose meshsweep Create
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meshsweep • There can only be one
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mirror Purpose mirror Reflect geome
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multiphysics Purpose multiphysics M
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multiphysics The table below descri
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multiphysics which domain group in
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multiphysics Elements of fem1.***.(
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multiphysics Fem.***.init is constr
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pde2geom Purpose pde2geom Convert a
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point1, point2, point3 Purpose poin
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poisson Purpose poisson Fast soluti
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poly1, poly2 Purpose poly1, poly2 C
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postarrow postarrow Purpose Shortha
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postcont postcont Purpose Shorthand
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postcoord fem.xmesh = meshextend(fe
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postcrossplot points for the differ
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postcrossplot TABLE 1-24: VALID PRO
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postcrossplot postcrossplot(fem,2,6
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posteval Purpose posteval Evaluate
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posteval Solnum is provided, the so
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postflow postflow Purpose Shorthand
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postglobaleval % Evaluate 'r+f' and
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postglobalplot If Outtype is 'handl
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postint Purpose postint Integrate e
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postinterp Purpose postinterp Evalu
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postinterp The property Phase is de
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postlin postlin Purpose Shorthand c
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postmin Purpose postmin Compute min
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postmovie TABLE 1-30: VALID PROPERT
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postplot TABLE 1-31: VALID PROPERTY
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postplot associated to each point o
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postplot fem.equ.c = 1; fem.equ.f =
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postprincbnd postprincbnd Purpose S
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postsurf postsurf Purpose Shorthand
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pyramid2, pyramid3 Purpose pyramid2
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ect1, rect2 Purpose rect1, rect2 Cr
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evolve Purpose revolve Revolve a 2D
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otate e1 = ellip2(0,0,1,3); e2 = ro
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sharg_2_5 Purpose sharg_2_5 Create
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shcurl Purpose shcurl Create a vect
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shdisc Purpose shdisc Create a disc
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shgp Purpose shgp Create a Gauss-po
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shlag Purpose shlag Create a Lagran
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solid0, solid1, solid2, solid3 The
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sphere3, sphere2 the evaluation con
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square1, square2 Purpose square1, s
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tangent Purpose tangent Create a ta
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tetrahedron2, tetrahedron3 Purpose
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torus2, torus3 TABLE 1-49: TORUS OB
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xmeshinfo is requested for. The pro
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xmeshinfo TABLE 1-52: NODES STRUCT
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xmeshinfo dofs.coords(:,30) % alter
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2 Diagnostics This chapter contains
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TABLE 2-2: GEOMETRY MODELING ERROR
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6000-6999 Assembly and Extended Mes
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TABLE 2-4: ASSEMBLY AND EXTENDED ME
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TABLE 2-5: SOLVER ERROR MESSAGES ER
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9000-9999 General Errors TABLE 2-6:
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Solver Error Messages These error m
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TABLE 2-7: SOLVER ERROR MESSAGES IN
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3 The COMSOL Multiphysics Files Thi
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2 m1 ######## Types 1 # number of t
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To load and save COMSOL Multiphysic
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Attribute Attribute Supported Versi
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BezierMfd BezierMfd Supported Versi
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BezierTri BezierTri Supported Versi
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BSplineMfd BSplineMfd Supported Ver
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BSplineSurf BSplineSurf Supported V
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Ellipse 0 # reverse 2 0 # major axi
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Geom1 Geom1 Supported Versions 1 Su
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Geom2 0 0 1 1 2.2999999999999998 1
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GeomFile GeomFile Supported Version
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Mesh Mesh Supported Versions 1 Subt
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MeshCurve MeshCurve Supported Versi
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Plane Plane Supported Versions 1 Su
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Serializable Serializable Supported
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Transform Transform Supported Versi
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VectorInt Supported Versions Vector
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Examples To illustrate the use of t
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410 506 409 528 762 760 831 859 525
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7 ... 5 5 5 224 # number of up/down
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# Faces # up down mfd tol 0 0 1 NAN
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INDEX 1D geometry object 196 3D mes
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flmesh2spline 186 flngdof 188, 191
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second fundamental matrices 226 ser
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