ICEM 原版培训教程(ANSYS 公司提供)5

Chapter3Chapter3ShellMeshing–Workshop1Workshop1StampedPartICEMCFDIntroductoryCourseWS3.1-1ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualCreateProject/OpenGeometry•FileNewProject–EntertheStampingfolder–Type•FileGeometryOpenGeometry…–Selectstamped_zero_thickness.TypeStamped-mesh–Savetin–OpenWS3.1-2ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualBuildTopologyBuildTopologyisabsolutelynecessarybeforerunningpatchbasedsurfacemesher:•Determinesconnectivityofsurfacessoeteescoecttyosuacessothatmeshisconnectedacrosssurfaces–GeometryRepairGeometryBuildDiagnosticTopology•Itisalwaysadvisabletoestimatetheallowablegap(tolerance)bymakingasmalldistancemeasurement•Leavethedefaulttoleranceat0.2.Couldbeslightlysmaller•LeaveFilterpointsandFiltercurvesoffp–Apply•AlsoextractscurvesandpointsWS3.1-3ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualSetCurveMeshSizes•ThePatchbasedsurfacemesherusescurvesizes,notsurfacesizes(exceptforwhenadaptmeshinteriorison)MeshCurveMeshSetup•MeshCurveMeshSetup–Selectallcurves–Maximumsize=1.5–Applyppy•Toviewnodepositions,rightmouseclickinthemodeltreeonCurvesCurveNodeSpacingSpacingWS3.1-4ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualSetShellMeshingParametersandCompute•Setthemeshdefaulttypeandmethodtouse•MeshGlobalMeshSetupShellMeshingParameters•Meshtype=QuadDominant(mostcommonforshellmeshes)•Meshmethod=PatchDependentp•SetSectiontoPatchDependent•Ignoresize=0.2–Nodesandthinloopswillbemergedacrossthisdistance–ThedefaultignoresizewillbethesameasthetolerancefromBuildgDiagnosticTopology•ComputeMesh•MeshComputeMeshSurfaceMeshOnlyCt•ComputeWS3.1-5ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualInspectSharpAngles•Zoomincloseontheredboxedsection–You’llnoticegridlinesmatchthecurvesattheboundariesonthissharp-angledtriangularsurfacetriangularsurface–Curvescanbedeletednon-permanently,whichwillnotdestroytheconnectivitybetweensurfaces–Thecurveswillbemadedormant–NodeswillnotbeconstrainedhereafterthecurvedeletionWS3.1-6ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualDeleteSomeCurves•GeometryDeleteCurvey–EnsurethatDeletepermanentlyisoff–Selectthecurvesshown–SelectYes,whenitsays,Meshexists.Rhtthdf?Remeshattachedsurfaces?–Meshisnolongerconstrainedtothesmallangle–Thereare3othersimilarlocationsinthismodelwherecurvescanalsobedeletedDormantcurvescanbeshownbyaWS3.1-7ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664DormantcurvescanbeshownbyarightmouseclickinthemodeltreeonCurvesShowDormantShellMeshing–Workshop1TrainingManualInspectSliverSurface•Zoomintothesliversurfaceintheredboxedarea–Usethetapemeasuretofindthedistanceacross(abot06)thedistanceacross(about0.6)•MeshGlobalMeshSetupShellMeshingParameters–SettheignoresizetoslightlySettheignoresizetoslightlygreaterthanthisdistance–Ignoresize=0.7–ApplyWS3.1-8ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualRecomputeMeshMeshCompteMeshSrface•MeshComputeMeshSurfaceMeshOnly–Compute•TheignoresizemergedouttheTheignoresizemergedoutthethinloop•ThiswouldhavealsotakencareoftheprevioussharpangleproblemifyoudidnotchoosetomakecurvesdormantWS3.1-9ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualQuadRings•Createquadringsaroundtheholes•MeshCurveMeshSetup–Selectthecurvesofthe5holesshown–The3parametersusedforsurfacemeshinflationare:•Height•HeightratioNmoflaers•Num.oflayers–IfonlytheNum.oflayersisentered,thentheHeightwillbethesameastheMaximumsizeandtheHeightratiowillassumedtobe1.–SetNum.oflayers=4–Apply•RecomputeMeshWS3.1-10ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualSetHeightandHeightRatio•Thequadringsareverybig,andyouwillnotice3ringsthatcollidewithnearbyfeatures,interruptingsomelayerssomelayers•MeshCurveMeshSetup–Selectthecurvesofthe5holesagain–Height=0.3(firstlayerhight)Collisions–Heightratio=1.4(1.0to1.5aretypical)–Apply•RecomputeMeshCollisionswithnearbyloopWS3.1-11ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664ShellMeshing–Workshop1TrainingManualSaveProjectOrOr•SaveProject•Savesgeometry,mesh,settingsfile(.prj),view–Meshsizesandmethodsaresavedtothegeometryfile(.tin)WS3.1-12ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.July2009Inventory#002664