COMSOL Multiphysics™

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femstatic Purpose femstatic Solve stationary PDE problem with a nonlinear or linear solver. Syntax Description fem.sol = femstatic(fem,...) fem = femstatic(fem,'Out',{'fem'},...) fem.sol = femstatic(fem) solves a stationary PDE problem using either a linear or nonlinear solver. fem.sol = femstatic(fem,'pname','P', plist',list,...) solves a stationary PDE problem for several values of the parameter P. The values of the parameter P are given in the vector list. The PDE problem is stored in the (possibly extended) FEM Structure fem. See femstruct for details. The function femstatic accepts the following property/value pairs: TABLE 1-38: VALID PROPERTY/VALUE PAIRS PROPERTY VALUE DEFAULT DESCRIPTION Nonlin off | on | auto auto Use the nonlinear solver Out fem | sol | u | plist | stop | solcompdof | Kc | Lc | Null | Nnp | ud | uscale | nullfun | symmetric | nonlin | cell array of these strings sol Output variables This solver uses the nonlinear solver described in femnlin if nonlin is on, and it uses the linear solver described in femlin if nonlin is off. If nonlin is set to auto an analysis is performed to automatically detect if the problem can be solved with the linear solver. In addition to the properties listed above, also the properties for femlin or femnlin are supported, depending on which solver is used. For example, the linear solver does not support the properties Augcomp, Augsolver, Augtol, Augmaxiter, Porder, and Ntol. Similarly, the nonlinear solver does not support the properties In and Itol. Furthermore, the properties described in the entry femsolver are supported. The automatic nonlinear/linear detection works in the following way. The linear solver is called if the residual jacobian matrix (the stiffness matrix, K) and the constraint jacobian matrix (the constraint matrix, N) are both found not solution 164 | CHAPTER 1: COMMAND REFERENCE
femstatic dependent and if these matrices are detected as complete. In all other situations the nonlinear solver is used. The analysis is performed by a symbolic analysis of the expressions contributing to these matrices. Complete here means that in the residual and constraint vectors, only expressions where found for which Comsol Multiphysics will compute the correct jacobian contribution. Therefore, if you want to solve a linearized (nonlinear) problem, you must select nonlin to off. Furthermore, there are variables for which Comsol Multiphysics is conservative and will flag these, and their jacobian contribution, as solution dependent even though they not always are. For these situations, the nonlinear solver will be used even though the linear solver could be used. This should only result in some extra computational effort, and should not influence the result. The opposite situation however, where the linear solver is used for a nonlinear problem is more dangerous. So, select nonlin to off with great care. See Also femlin, femnlin, femsolver, femstruct, assemble, asseminit 165
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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
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
Page 169 and 170: femsolver scalar Shapechg, and the
Page 171 and 172: femsolver TABLE 1-36: OBSOLETE PROP
Page 173: femstate with the property State=on
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 and 224: 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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