STARCCM实例操作教程(凤洞仿真)

WORKSHOP:TheSTAR-CCM+workflow43IntroducesthemainprocessesinSTAR-CCM+CarinawindtunnelObjective:FollowthroughallthestagesintheSTAR-CCM+workflow.GainconfidenceinusingtheSTAR-CCM+interface.Thisexerciseusesasimplegeometryofacarinawindtunnel.Laterexerciseswillbuildonthebasicslearnthere.44WorkflowforasimplecarFeaturescovered:Import.x_tgeometryofsurface.Nosurfacerepairrequired.Splitsurfacestodefinerequiredboundaries.Definemeshsettings.•Specifythicknessofprismlayer.Definephysicssettings.•Incompressible,turbulent,steady.Checksolversettings.•Usedefaults.Runsimulation.Postprocessingiscoveredinnextexercise!45StartaSTAR-CCM+simulation1.LaunchSTAR-CCM+.2.StartanewsimulationbygoingtoFileNewSimulation…3.KeepthedefaultsettingsinthedialogueboxandclickonOK.46Importgeometry1.FileImportImportSurfaceMeshandchoosethesurfacenamedWorkflow/wind_tunnel.x_t.2.SelecttoCreateNewPart,leaveremainingoptionsattheirdefaultvaluesandclickOKintheImportSurfaceOptionsdialog.47ImportGeometryTheimportshowsonegeometrypart,containingonesurface.1.Inthescene/plotpanelselectGeometryScene1DisplayersGeometry1.2.InthePropertiespanel,turnontheMeshdisplayoption.Geometryandscalardisplayersalsochangebyusingthescenetoolbar’sactivatemeshbutton.3.Savethefileaswind_tunnel.sim.48CheckSurfaceCheckthesurfaceforerrors.1.Gotothesimulationtree.2.Right-clickonGeometryPartswind_tunnelRepairSurface...3.ClickOKintheopeningwindow.49CheckSurface1.IntheeditpanelclickonManageThresholds.2.Inthenewpanelcheckthatallthresholdsareactive,thenclickApplyandOK.50CheckSurfaceTherearenograveerrorsinthegeometry,closethepanelaftercheckingthem.•TheCloseProximityFacesareresolvedaftersplittingandinterfacecreation.•PoorQualityFacesaregoneafterremeshing.51ScalingandSplittingWeneedtoscaletheimportbyafactorof10tochangethelengthtometers.1.SelectGeometryPartswind_tunnelnode.2.RightclickandselectTransformScalefromcontextmenu.a.InthedialogboxenteraScaleFactorof10.b.ClickApplyandClose.3.ClickontheResetViewicon.Splittheimportedsurfacestoassigntoindividualboundaries.1.SelecttheGeometryPartswind_tunnelSurfacesFacesnode.2.RightclickandselectSplitbyPatch...fromthecontextmenu.52SpecifygeometrysetupSplitandrenamethePartSurfaces.1.Clickthefrontfaceoftheairflowinthewindtunnel,renameittoInletandclickCreate.2.Dothesamefortheotherfaces:a.ThesymmetryfaceSymmetryb.ThesidefaceWallc.ThebackfaceOutletd.ThebottomfaceFloore.ThetopfaceTop3.ClickClose.53InletWallTopSymmetryFloorOutletSpecifygeometrysetupSplitthecarintoseparatesurfacestoo.1.RightclickonFacesandselectSplitNon-Contiguousfromcontextmenu.2.Clickonthenamesofthethreenewlycreatedsurfacestohighlighttheirgeometryinthescene.3.SelectthetwowheelsusingCTRL,thenrightclickandselectCombinetogatherthemunderthesameboundary.4.RenamethewheelsasWheelsandthecarasBody.54TransferofgeometryelementsSTAR-CCM+separatesgeometrypartsfromsimulationrelevantregions.Simulationrelevantpartsneedtobetransferredintotheregionsfolder.1.Selectwind_tunnelAssignPartstoRegions…2.Modes:a.Oneregionperpart.b.Oneboundaryperpartsurface.3.ClickCreateRegionsandClose.55DefineboundaryconditionsTheboundarytypeaffectsthemeshing.1.GotoRegions.2.SelecteachboundaryandsetitsTypeinthePropertieswindowfollowingthetablebelow.56BoundaryTypeFloor,Top,Wall,Body,WheelsWallInletVelocityInletOutletPressureOutletSymmetrySymmetryPlaneSelectmeshmodelsSelectthemeshingmodels,STAR-CCM+loadsadditionalfunctionalityonlyifrequired.1.GotoPartswind_tunnel.2.RightclickandselectCreateMeshOperationAutomatedMesh.3.Checkthatwind_tunnelisselectedforPartsandselectthemodels:a.SurfaceRemesher.b.TrimmedCellMesher.c.PrismLayerMesher.4.ClickOK.›AnewentryappearsunderOperations.›Theyellowexclamationmarkindicatesthatthisoperationhasnotbeenexecutedyet.57DefaultmeshsettingsMakethedefaultmeshsettings.1.GotoOperationsAutomatedMesh.2.UnderDefaultControlsset:a.BaseSize:0.25m.b.PrismLayerTotalThicknessRelativeSize:10%.58GeneratemeshStartthemeshingpipeline.1.GotoOperationsAutomatedMesh.2.RightclickandselectExecute.›OrpresstheGenerateVolumeMeshbuttoninthetoolbar.›STAR-CCM+automaticallygeneratesasurfacemesh,thenavolumemeshwithprismlayersonthewalls.›TheexclamationmarkdisappearsandanewnodeisaddedtoContinua:PartsMeshes.59GeneratemeshInanewscenethemeshisvisualized.1.Createanewmeshscene.a.RightclickontheScenesNewSceneMesh.b.OrusetheCreate/OpenScenesbuttoninthevistoolbar:2.Makethescenetransparent.60VisualizeMeshChangetheview.1.PressTonyourkeyboard.›ThisisashortcutforTopviewinz-direction.2.Makeviewparallel.a.Clickonthecameraicon.b.SelectProjectionParallel.Createasectionplanethroughthewheels.1.Inthevistoolbarclickonthefxicon.2.Drawalineinthesceneasshowninthepicture.3.ChoosetoselectaNewGeometryDisplayer.61VisualizeMeshChangethepositionofthesectionplaneifitdoesn'tcutthroughthewheel.1.GotoDerivedPartsplanesection.2.InthepropertieswindowofSinglesectionclickontheOffsetvalue.›Asliderappearsandallowstoadjustthepositioninteractively.62VisualizeMeshHidedisplayerMesh1.1.Gotothescene/plotpanel.2.RightclickDisplayersMesh1ToggleV