COMSOL Multiphysics™

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geomexport Purpose geomexport Export geometry objects to file. Syntax Description geomexport(filename, geoms,...) geomexport(filename, geoms...) exports the geometry data in the cell array geoms of geometry objects to a file. filename can be any of the following formats: TABLE 1-60: FILE FORMAT NOTE FILE EXTENSIONS <strong>COMSOL</strong> Multiphysics Binary <strong>COMSOL</strong> Multiphysics Text DXF The following properties are supported TABLE 1-61: VALID PROPERTY/VALUE PAIRS PROPERTY NAME PROPERTY VALUE DEFAULT .mphbin .mphtxt .dxf DESCRIPTION Report on | off on Display a progress window Report determines if a progress window should appear during the call. Examples Diagnostics See Also r = rect2; geomexport('foo.dxf',{r}) b = block3; geomexport('bar.mphtxt',{b}) geomexport replaces the functionality of the 3.1 functions dxfwrite. geom0, geom1, geom2, geom3, meshexport, geomimport 214 | CHAPTER 1: COMMAND REFERENCE
geomfile Purpose geomfile Geometry M-file. Syntax Description ne = geomfile d = geomfile(bs) [x,y] = geomfile(bs,s) The Geometry M-file is a template format for a user-specified M-file that contains the complete geometry of the PDE problem. You can specify both 1D and 2D geometries by using the Geometry M-file format. The geomfile format is not supported in 3D. 1D Geometry For 1D geometries, the Geometry M-file essentially contains a set of points, and geometry information on the intervals between these point. ne = geomfile returns the number of boundary points ne. d = geomfile(bs) returns a matrix d with one column for each boundary point specified in bs, with the following contents: • Row 1 contains the x-coordinate of the boundary point • Row 2 contains the label of the “up” subdomain (“up” is the positive direction) • Row 3 contains the label of the “down” subdomain (“down” is the negative direction) The complement of the union of all subdomains is assigned the subdomain number 0. 2D Geometry 2D subdomains are represented by parameterized edge segments. Both the subdomains and edge segments are assigned unique positive numbers as labels. The edge segments cannot overlap. The full 2D problem description can contain several nonintersecting subdomains, and they can have common interior boundary segments. The boundary of a subdomain can consist of several edge segments. Each subdomain boundary need to consist of at least two edge segments. All edge segment junctions must coincide with edge segment endpoints. ne = geomfile returns the number of edge segments ne. d = geomfile(bs) returns a matrix d with one column for each edge segment specified in bs, with the following contents: • Row 1 contains the start parameter value • Row 2 contains the end parameter value 215
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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
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elcontact See Also elmapextr 57
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elcplextr transformation is used as
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elcplgenint Purpose elcplgenint Def
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elcplproj Purpose elcplproj Define
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elcplproj map1.dg = '1'; map1.dv =
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elcplscalar el.elem = 'elcplscalar'
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elempty Purpose elempty Define some
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elempty clear el; el.elem = 'elempt
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elepspec Examples Given a single-ge
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eleqc Make sure that the integratio
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eleqw fem.elem = [fem.elem {el}]; f
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elgeom Purpose elgeom Define geomet
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elgpspec elgpspec can be added in t
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elinline el.dexpr = {'1/(2*sqrt(a)+
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elinterp el.elem = 'elinterp'; el.n
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elirradiation Purpose elirradiation
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ellip1, ellip2 Purpose ellip1, elli
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ellipsoid2, ellipsoid3 Purpose elli
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elmapextr Purpose elmapextr Define
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elmapextr fem.sol = femeig(fem,'nei
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elode Purpose elode Define global s
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elpconstr Purpose elpconstr Define
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elplastic Purpose elplastic Define
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elpric Purpose elpric Define variab
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elsconstr vector. The normal compon
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elshape TABLE 1-20: BASIC MESH ELEM
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elshell_arg2 Purpose elshell_arg2 C
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elshell_arg2 Postprocessing variabl
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elvar Purpose elvar Define expressi
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extrude Purpose extrude Extrude a 2
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face3 Purpose face3 Create 3D surfa
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femdiff Purpose femdiff Symbolicall
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femeig Purpose femeig Solve eigenva
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femeig where Ω is the L-shaped mem
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femlin KN T N 0 U - U 0 Λ = L M ,
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femlin nullfun and symmetric can be
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femmesh Purpose femmesh Create a me
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femmesh Tetrahedral element (tet):
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femmesh FACE (EDGE NODES) FACE MID
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femnlin Purpose femnlin Solve nonli
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femnlin components fixed, the augme
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femnlin The property Rstep sets a r
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femplot PROPERTY VALUE DEFAULT DESC
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femsim The names of the input varia
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femsim Most of the FEMLAB 2.3 data
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femsol Example Create a solution ob
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femsolver TABLE 1-30: COMMON SOLVER
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femsolver PROBE PLOT PARAMETERS Pro
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femsolver Equations” on page 440
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femsolver TABLE 1-33: DIRECT LINEAR
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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
Page 173 and 174: femstate with the property State=on
Page 175 and 176: femstatic dependent and if these ma
Page 177 and 178: femtime Purpose femtime Solve time-
Page 179 and 180: femtime initial values are consiste
Page 181 and 182: femtime Cautionary In structural me
Page 183 and 184: femwave and then transforms the PDE
Page 185 and 186: femwave Weak coefficients are cell
Page 187 and 188: fillet Purpose fillet Create circul
Page 189 and 190: flcontour2mesh Purpose flcontour2me
Page 191 and 192: flform Purpose flform Convert betwe
Page 193 and 194: flim2curve Purpose flim2curve Creat
Page 195 and 196: flload Purpose flload Load a COMSOL
Page 197 and 198: flmesh2spline figure meshplot(msh)
Page 199 and 200: flnull Purpose flnull Compute null
Page 201 and 202: flreport Purpose flreport Globally
Page 203 and 204: flsmhs, flsmsign, fldsmhs, fldsmsig
Page 205 and 206: gencyl2, gencyl3 s2 = gencyl2(...)
Page 207 and 208: geom0, geom1, geom2, geom3 edge is
Page 209 and 210: geom0, geom1, geom2, geom3 See Also
Page 211 and 212: geomanalyze % Circle moving through
Page 213 and 214: geomarrayr The input argument g1, g
Page 215 and 216: geomcomp Purpose geomcomp Analyze g
Page 217 and 218: geomcsg g = geomcsg(sl,pl,...) deco
Page 219 and 220: geomcsg TABLE 1-57: GEOMETRY MODEL
Page 221 and 222: geomdel Purpose geomdel Delete poin
Page 223: geomedit Purpose geomedit Edit geom
Page 227 and 228: geomfile clear fem fem.geom = 'card
Page 229 and 230: geomgetwrkpln respect to the face.
Page 231 and 232: geomgroup Examples See Also [g pair
Page 233 and 234: geomimport TABLE 1-64: VALID PROPER
Page 235 and 236: geominfo Out specifies the geometry
Page 237 and 238: geominfo DD = reshape(ff2{m}(im1,im
Page 239 and 240: geominfo The following commands, se
Page 241 and 242: geomobject Purpose geomobject Creat
Page 243 and 244: geomplot design philosophy has been
Page 245 and 246: geomplot 2D Example Start by creati
Page 247 and 248: geomposition Purpose geomposition P
Page 249 and 250: geomspline p agree to within 1000*e
Page 251 and 252: getparts Purpose getparts Extract p
Page 253 and 254: line1, line2 Purpose line1, line2 C
Page 255 and 256: loft gl{2} and so on. It is require
Page 257 and 258: loft See Also extrude, geomgetwrkpl
Page 259 and 260: mesh2geom fem.mesh=meshinit(rect2);
Page 261 and 262: meshcaseadd The mesh case generatio
Page 263 and 264: meshdel Purpose meshdel Delete elem
Page 265 and 266: meshembed Purpose meshembed Embed a
Page 267 and 268: meshenrich TABLE 1-4: VALID PROPERT
Page 269 and 270: meshexport Purpose meshexport Expor
Page 271 and 272: meshextrude Purpose meshextrude Ext
Page 273 and 274: 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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