COMSOL Multiphysics™

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postgp Purpose postgp Extract gauss points and gauss point weights. Syntax Description gp = postgp(type,order) [gp,gpw] = postgp(type,order) postgp(type,order) returns the gauss points of order order for element of type type. [gp,gpw] = postgp(type,order) additionally returns the gauss point weights. The gauss points and their weights are the ones used in postint when computing integrals. The input type must be one of the following: vtx, edg, tri, quad, tet, prism, hex corresponding to vertex element, edge element, triangular element, quadrilateral element, tetrahedral element, prism element, and hexahedral element, respectively. Examples % The second order gauss points for a triangular element gp = postgp('tri',2); % The third order gauss points and their weights for a hexahedral % element [gp,gpw] = postgp('hex',3); Compatibility See Also This function was introduced in <strong>COMSOL</strong> Multiphysics 3.2a. posteval, postint 342 | CHAPTER 1: COMMAND REFERENCE
postint Purpose postint Integrate expressions in domains with arbitrary space dimension. Syntax Description [v1,v2,...,vn] = postint(fem,e1,e2,...,en,...) [v1,i2,...,vn] = postint(fem,e1,e2,...,en,...) returns the integrals v1,v2,...,vn of the expressions e1,...,en. The integrals can be evaluated on any domain type: subdomain, boundary, edge, and vertex, using one or several solutions. When the several solutions are provided, each vi is a vector with values corresponding to the solutions. The expressions that are integrated can be expressions involving variables, in particular application mode variables. postint accepts the following property/value pairs: TABLE 1-28: VALID PROPERTY/VALUE PAIRS PROPERTY NAME PROPERTY VALUE DEFAULT DESCRIPTION Const cell array List of assignments of constants Dl integer vector all domains Domain list Edim integer full Element dimension Frame string spatial frame Coordinate frame Geomnum positive integer 1 Geometry number Intorder positive integer See below Integration order Phase integer vector 0 Phase angle Solnum integer vector | See below Solution numbers all | end T double vector See below Time for evaluation U solution object or vector fem.sol or 0 Solution(s) for evaluation The expressions ei are integrated for one or several solutions. Each solution generates an element in the output vectors vi. The properties Solnum and T control what solutions are used for the evaluations. If Solnum is provided, the solution indicated by the indices provided with the Solnum property are used. It T is provided, solutions are interpolated The property T can only be used for time dependent solutions. If nether Solnum nor T is provided, a single solution is evaluated. For parametric and time-dependent solutions, the final solution is used. For eigenvalue solution the first solution is used. 343
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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
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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
Page 301 and 302: meshrefine Purpose meshrefine Refin
Page 303 and 304: meshrevolve Purpose meshrevolve Rev
Page 305 and 306: meshsmooth Purpose meshsmooth Smoot
Page 307 and 308: meshsweep Purpose meshsweep Create
Page 309 and 310: meshsweep • There can only be one
Page 311 and 312: mirror Purpose mirror Reflect geome
Page 313 and 314: multiphysics Purpose multiphysics M
Page 315 and 316: multiphysics The table below descri
Page 317 and 318: multiphysics which domain group in
Page 319 and 320: multiphysics Elements of fem1.***.(
Page 321 and 322: multiphysics Fem.***.init is constr
Page 323 and 324: pde2geom Purpose pde2geom Convert a
Page 325 and 326: point1, point2, point3 Purpose poin
Page 327 and 328: poisson Purpose poisson Fast soluti
Page 329 and 330: poly1, poly2 Purpose poly1, poly2 C
Page 331 and 332: postarrow postarrow Purpose Shortha
Page 333 and 334: postcont postcont Purpose Shorthand
Page 335 and 336: postcoord fem.xmesh = meshextend(fe
Page 337 and 338: postcrossplot points for the differ
Page 339 and 340: postcrossplot TABLE 1-24: VALID PRO
Page 341 and 342: postcrossplot postcrossplot(fem,2,6
Page 343 and 344: posteval Purpose posteval Evaluate
Page 345 and 346: posteval Solnum is provided, the so
Page 347 and 348: postflow postflow Purpose Shorthand
Page 349 and 350: postglobaleval % Evaluate 'r+f' and
Page 351: postglobalplot If Outtype is 'handl
Page 355 and 356: postinterp Purpose postinterp Evalu
Page 357 and 358: postinterp The property Phase is de
Page 359 and 360: postlin postlin Purpose Shorthand c
Page 361 and 362: postmin Purpose postmin Compute min
Page 363 and 364: postmovie TABLE 1-30: VALID PROPERT
Page 365 and 366: postplot TABLE 1-31: VALID PROPERTY
Page 375 and 376: postplot associated to each point o
Page 377 and 378: postplot fem.equ.c = 1; fem.equ.f =
Page 379 and 380: postprincbnd postprincbnd Purpose S
Page 381 and 382: postsurf postsurf Purpose Shorthand
Page 383 and 384: pyramid2, pyramid3 Purpose pyramid2
Page 385 and 386: ect1, rect2 Purpose rect1, rect2 Cr
Page 387 and 388: evolve Purpose revolve Revolve a 2D
Page 389 and 390: otate e1 = ellip2(0,0,1,3); e2 = ro
Page 391 and 392: sharg_2_5 Purpose sharg_2_5 Create
Page 393 and 394: shcurl Purpose shcurl Create a vect
Page 395 and 396: shdisc Purpose shdisc Create a disc
Page 397 and 398: shgp Purpose shgp Create a Gauss-po
Page 399 and 400: shlag Purpose shlag Create a Lagran
Page 401 and 402: 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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