Gambit edge face meshing 边界与面网格划分

EdgeandFaceMeshingMeshing-GeneralGeneralmeshingcharacteristicsEdges,FacesandVolumesaredirectlymeshedPre-meshingMeshedgesbeforemeshingfacestocontroldistributionofcellsinfacesMeshfacesbeforevolumestocontroldistributionofcellsinvolumesIfnotpre-meshed,meshingofhighergeometrywillfirstmeshalllowergeometryinthefollowingorder:EdgemeshingBoundarylayersFacemeshingVolumemeshingEdgeMeshingControlmeshdensityanddistributioninafaceorvolumebymeshingtheedgesfirst.Edgemeshdistributioniscontrolledthrough

thespacingandgradingparameters.UsingtheEdgemeshingformPickingTemporarygraphicsLinks,DirectionsGrading/SpacingSpecialcharacteristicsApplyandDefaultsInvertandReverseOptionsApplywithoutmeshingPickingEdgesforMeshingPickingTemporarilymeshededgesWhenyoupickanedge,theedgeis

temporarilymeshedusingwhitenodesDisplayededgemeshisbasedoncurrentgradingandspacingparametersIfyoumodifytheschemeorspacing,thetemporarymeshwillbeimmediatelyupdatedWhenyouApply,themeshnodeswillturnblueSenseSenseisusedtoshowdirectionofgradingEverypickededgewillshowitssensedirectionusinganarrowThesensecanbereversedbyashift-middleclickonthelastedgepicked(thisisinadditiontothe“next〞functionality)orbyclickingontheReversebuttonSoftLinksPickingandsoftlinksPickwithlinksByenablingthisoption,Soft-linkededgescanbe selectedinasinglepickLinkededgessharethesameinformationandcanbepickedinasinglepickModifyingsoftlinksYoucananytime:FormlinksBreaklinksMaintainlinksBydefault,GAMBITwillformlinksbetweenunmeshededgesthatarepickedtogetherBydefault,GAMBITwillmaintainlinksbetweenmeshededgesthatarepickedtogetherGradingControlsmeshdensitydistributionalonganedge.Gradingcanproducesingle-sidedordouble-sidedmeshDoubled-sidedmeshcanbesymmetricorasymmetric.Symmetricschemesproducesymmetricmeshaboutedgecenter.Asymmetricschemescanproduceasymmetricmeshaboutedgecenter.Single-sidedgrading:Usesamultiplicativeconstant,R,todescribetheratioofthelengthoftwoadjacentmeshelements,i.e.,R=l(i+1)/liRcanbespecifiedexplicitly(SuccessiveRatio)ordeterminedindirectlyGambitalsousesedgelengthandspacinginformationtodetermineR.Single-sidedgradingSymmetricgradingAsymmetricgradingDoubleSidedGradingSymmetricgradingschemesimplicitlygeneratedoublesidedgradingthatissymmetric.AsymmetricschemesareaccessiblewhenDouble-SidedOptionisusedwith:SuccessiveRatio,FirstLength,LastLength,First-LastRatio,andLast-FirstRatioThemeshissymmetricifR1andR2areequal.ThemeshisasymmetricifR1andR2arenotequal.Edgecenterisdeterminedautomatically.SpacingSpacingInallmeshingforms,thefollowingspacingfunctionscanbespecified:Intervalcount-recommendedforedgemeshingonlyAvalueof5creates5intervalsontheedge(6nodes,includingends)%ofedgelength-recommendedforedgemeshingonlyAnedgelengthof10andavalueof20creates5intervalsontheedgeIntervalsize-thedefaultsettingIdentifiestheintervalsizerelativetooveralldimensionsofgeometryIdentifies“average〞intervalsizeifusedwithgradingAnedge-lengthof10andavalueof2creates5intervalsontheedgeAveragesizeofelements/gridis2FirstEdgeSettingsUsefirstedgesettingsenabledFirstedgeselectedinpicklistupdatesformUsefultocopysettingsfromonemeshed

edgetootheredges.UsefirstedgesettingsdisabledAnytimeyoupicktwoormoremeshededgeswherethereisadifferencein:theTypetheSpacing thelocalApplybuttonforthatoptionwillbeturnedoffThisallowsyoutomaintainpre-existinggradingand/orspacingsettingsforeachedge.Enforceachangeingradingand/orspacingbyenablingApplybutton.MeshOptionsApplywithoutmeshingThisoptionisusefulincaseswhereyouwanttoimposeaschemewithoutfixingthenumberofintervalsThehigherlevelmeshingschemewilldecide(andmatch)theintervalsExample FacemeshingwillautomaticallymatchmeshonoppositesideSpecifyafixedintervalandnogradingonthisedgeSpecifydoublesidedgradingonalltheseedgesandApplywithoutMeshingFaceMeshing:StructuredGridsDifferenttypesofhexahedralgridsSingle-block(requiredforFLUENT

4)ThemeshhastoberepresentedinasingleblockConnectivityinformation(identifyingcellneighbors)forentiremeshisaccessedbythreecomputevariables,i,j,k. Single-blockgeometry LogicalrepresentationSingle-blockmeshesmayinclude180degreecorners(atthevertices)whichareunsuitableforFEMcodes(FIDAP,POLYFLOW)++++FaceMeshing:UnstructuredGrid-1DifferenttypesofhexahedralgridsMulti-block(allcodes,exceptFLUENT4)Themeshcanberepresentedinmultipleblocks Multi-blockgeometry LogicalrepresentationThisstructuregivesfullcontrolofthemeshgrading,usingedgemeshing,withhigh-qualityelementsManualcreationofmulti-blockstructuresisusuallymoretime-consumingcomparedtounstructuredmeshesFaceMeshing:UnstructuredGrids-2DifferenttypesofhexahedralgridsUnstructured(allsolvers,exceptFLUENT4)Themeshhasnologicalrepresentation UnstructuredGridFaceMeshingFaceMeshingform: UponpickingafaceGAMBITautomaticallychoosesQuadelementsGAMBITchoosestheTypebasedontheSolver/facevertextypesAvailableelement/schemetypecombinationsQuadMapSubmapTri-PrimitivePaveQuad/TriMapPaveWedgeTriPaveFaceMeshing-QuadExamplesQuad:MapQuad:SubmapQuad:Tri-PrimitiveQuad:PaveFaceMeshing-Quad/TriandTriExamplesQuad/Tri:MapQuad/Tri:PaveQuad/Tri:WedgeTri:PaveDeletingOldMeshExistingmeshmustberemovedbeforeremeshing.Meshcanbedeletedusing

deletemeshform.Lowertopologymeshcanalsobedeleted(default)ExistingmeshcanalsoberemovedinallCreate

meshformswithouttheneedforDeletemeshRemovemeshLeavesalllowertopologymeshRemovemesh+lowermeshRemovesalllowermeshthatisnotshared

withanotherentityUndoaftermeshingoperationalsoworks!LinkingPeriodic/CyclicBoundariesGeneraltools MeshLinks(HardLinks)MeshlinkedentitiesareinstantaneouslyupdatedsothatthemeshisidenticalMeshlinksexistsintheEdge,Face,andVolumeformsSpeciallycreatedforperiodicboundaryconditionsReverse