Gambit edge face meshing 边界与面网格划分.ppt

EdgeandFaceMeshing Meshing General GeneralmeshingcharacteristicsEdges FacesandVolumesaredirectlymeshedPre meshingMeshedgesbeforemeshingfacestocontroldistributionofcellsinfacesMeshfacesbeforevolumestocontroldistributionofcellsinvolumesIfnotpre meshed meshingofhighergeometrywillfirstmeshalllowergeometryinthefollowingorder EdgemeshingBoundarylayersFacemeshingVolumemeshing EdgeMeshing Controlmeshdensityanddistributioninafaceorvolumebymeshingtheedgesfirst Edgemeshdistributioniscontrolledthroughthespacingandgradingparameters UsingtheEdgemeshingformPickingTemporarygraphicsLinks DirectionsGrading SpacingSpecialcharacteristicsApplyandDefaultsInvertandReverseOptionsApplywithoutmeshing PickingEdgesforMeshing PickingTemporarilymeshededgesWhenyoupickanedge theedgeistemporarilymeshedusingwhitenodesDisplayededgemeshisbasedoncurrentgradingandspacingparametersIfyoumodifytheschemeorspacing thetemporarymeshwillbeimmediatelyupdatedWhenyouApply themeshnodeswillturnblueSenseSenseisusedtoshowdirectionofgradingEverypickededgewillshowitssensedirectionusinganarrowThesensecanbereversedbyashift middleclickonthelastedgepicked thisisinadditiontothe next functionality orbyclickingontheReversebutton SoftLinks PickingandsoftlinksPickwithlinksByenablingthisoption Soft linkededgescanbeselectedinasinglepickLinkededgessharethesameinformationandcanbepickedinasinglepickModifyingsoftlinksYoucananytime FormlinksBreaklinksMaintainlinksBydefault GAMBITwillformlinksbetweenunmeshededgesthatarepickedtogetherBydefault GAMBITwillmaintainlinksbetweenmeshededgesthatarepickedtogether Grading Controlsmeshdensitydistributionalonganedge Gradingcanproducesingle sidedordouble sidedmeshDoubled sidedmeshcanbesymmetricorasymmetric Symmetricschemesproducesymmetricmeshaboutedgecenter Asymmetricschemescanproduceasymmetricmeshaboutedgecenter Single sidedgrading Usesamultiplicativeconstant R todescribetheratioofthelengthoftwoadjacentmeshelements i e R l i 1 liRcanbespecifiedexplicitly SuccessiveRatio ordeterminedindirectlyGambitalsousesedgelengthandspacinginformationtodetermineR DoubleSidedGrading Symmetricgradingschemesimplicitlygeneratedoublesidedgradingthatissymmetric AsymmetricschemesareaccessiblewhenDouble SidedOptionisusedwith SuccessiveRatio FirstLength LastLength First LastRatio andLast FirstRatioThemeshissymmetricifR1andR2areequal ThemeshisasymmetricifR1andR2arenotequal Edgecenterisdeterminedautomatically Spacing SpacingInallmeshingforms thefollowingspacingfunctionscanbespecified Intervalcount recommendedforedgemeshingonlyAvalueof5creates5intervalsontheedge 6nodes includingends ofedgelength recommendedforedgemeshingonlyAnedgelengthof10andavalueof20creates5intervalsontheedgeIntervalsize thedefaultsettingIdentifiestheintervalsizerelativetooveralldimensionsofgeometryIdentifies average intervalsizeifusedwithgradingAnedge lengthof10andavalueof2creates5intervalsontheedgeAveragesizeofelements gridis2 FirstEdgeSettings UsefirstedgesettingsenabledFirstedgeselectedinpicklistupdatesformUsefultocopysettingsfromonemeshededgetootheredges UsefirstedgesettingsdisabledAnytimeyoupicktwoormoremeshededgeswherethereisadifferencein theTypetheSpacingthelocalApplybuttonforthatoptionwillbeturnedoffThisallowsyoutomaintainpre existinggradingand orspacingsettingsforeachedge Enforceachangeingradingand orspacingbyenablingApplybutton MeshOptions ApplywithoutmeshingThisoptionisusefulincaseswhereyouwanttoimposeaschemewithoutfixingthenumberofintervalsThehigherlevelmeshingschemewilldecide andmatch theintervalsExample Facemeshingwillautomaticallymatchmeshonoppositeside Specifyafixedintervalandnogradingonthisedge SpecifydoublesidedgradingonalltheseedgesandApplywithoutMeshing FaceMeshing StructuredGrids DifferenttypesofhexahedralgridsSingle block requiredforFLUENT4 ThemeshhastoberepresentedinasingleblockConnectivityinformation identifyingcellneighbors forentiremeshisaccessedbythreecomputevariables i j k Single blockgeometryLogicalrepresentationSingle blockmeshesmayinclude180degreecorners atthevertices whichareunsuitableforFEMcodes FIDAP POLYFLOW FaceMeshing UnstructuredGrid 1 DifferenttypesofhexahedralgridsMulti block allcodes exceptFLUENT4 ThemeshcanberepresentedinmultipleblocksMulti blockgeometryLogicalrepresentationThisstructuregivesfullcontrolofthemeshgrading usingedgemeshing withhigh qualityelementsManualcreationofmulti blockstructuresisusuallymoretime consumingcomparedtounstructuredmeshes FaceMeshing UnstructuredGrids 2 DifferenttypesofhexahedralgridsUnstructured allsolvers exceptFLUENT4 ThemeshhasnologicalrepresentationUnstructuredGrid FaceMeshing FaceMeshingform UponpickingafaceGAMBITautomaticallychoosesQuadelementsGAMBITchoosestheTypebasedontheSolver facevertextypesAvailableelement schemetypecombinationsQuadMapSubmapTri PrimitivePaveQuad TriMapPaveWedgeTriPave FaceMeshing QuadExamples Quad MapQuad SubmapQuad Tri PrimitiveQuad Pave FaceMeshing Quad TriandTriExamples Quad Tri MapQuad Tri PaveQuad Tri WedgeTri Pave DeletingOldMesh Existingmeshmustberemovedbeforeremeshing Meshcanbedeletedusingdeletemeshform Lowertopologymeshcanalsobedeleted default ExistingmeshcanalsoberemovedinallCreatemeshformswithouttheneedforDeletemeshRemovemeshLeavesalllowertopologymeshRemovemesh lowermeshRemovesalllowermeshthatisnotsharedwithanotherentityUndoaftermeshingoperationalsoworks LinkingPeriodic CyclicBoundaries GeneraltoolsMeshLinks HardLinks MeshlinkedentitiesareinstantaneouslyupdatedsothatthemeshisidenticalMeshlinksexistsintheEdge Face andVolumeformsSpeciallycreatedforperiodicboundaryconditions Reverseorientationis