STARCCM实例操作教程(凤洞仿真)ppt课件

1、WORKSHOP:TheSTAR-CCM+workflow,43,IntroducesthemainprocessesinSTAR-CCM+,Carinawindtunnel,Objective:FollowthroughallthestagesintheSTAR-CCM+workflow.GainconfidenceinusingtheSTAR-CCM+interface.Thisexerciseusesasimplegeometryofacarinawindtunnel.Laterexerciseswillbuildonthebasicslearnthere.,44,Workflowfor

2、asimplecar,Featurescovered:Import.x_tgeometryofsurface.Nosurfacerepairrequired.Splitsurfacestodefinerequiredboundaries.Definemeshsettings.Specifythicknessofprismlayer.Definephysicssettings.Incompressible,turbulent,steady.Checksolversettings.Usedefaults.Runsimulation.Postprocessingiscoveredinnextexer

3、cise!,45,StartaSTAR-CCM+simulation,LaunchSTAR-CCM+.StartanewsimulationbygoingtoFileNewSimulationKeepthedefaultsettingsinthedialogueboxandclickonOK.,46,Importgeometry,FileImportImportSurfaceMeshandchoosethesurfacenamedWorkflow/wind_tunnel.x_t.SelecttoCreateNewPart,leaveremainingoptionsattheirdefaultv

4、aluesandclickOKintheImportSurfaceOptionsdialog.,47,ImportGeometry,Theimportshowsonegeometrypart,containingonesurface.Inthescene/plotpanelselectGeometryScene1DisplayersGeometry1.InthePropertiespanel,turnontheMeshdisplayoption.Geometryandscalardisplayersalsochangebyusingthescenetoolbarsactivatemeshbut

5、ton.Savethefileaswind_tunnel.sim.,48,CheckSurface,Checkthesurfaceforerrors.Gotothesimulationtree.Right-clickonGeometryPartswind_tunnelRepairSurface.ClickOKintheopeningwindow.,49,CheckSurface,IntheeditpanelclickonManageThresholds.Inthenewpanelcheckthatallthresholdsareactive,thenclickApplyandOK.,50,Ch

6、eckSurface,Therearenograveerrorsinthegeometry,closethepanelaftercheckingthem.TheCloseProximityFacesareresolvedaftersplittingandinterfacecreation.PoorQualityFacesaregoneafterremeshing.,51,ScalingandSplitting,Weneedtoscaletheimportbyafactorof10tochangethelengthtometers.SelectGeometryPartswind_tunnelno

7、de.RightclickandselectTransformScalefromcontextmenu.InthedialogboxenteraScaleFactorof10.ClickApplyandClose.ClickontheResetViewicon.Splittheimportedsurfacestoassigntoindividualboundaries.SelecttheGeometryPartswind_tunnelSurfacesFacesnode.RightclickandselectSplitbyPatch.fromthecontextmenu.,52,Specifyg

8、eometrysetup,SplitandrenamethePartSurfaces.Clickthefrontfaceoftheairflowinthewindtunnel,renameittoInletandclickCreate.Dothesamefortheotherfaces:ThesymmetryfaceSymmetryThesidefaceWallThebackfaceOutletThebottomfaceFloorThetopfaceTopClickClose.,53,Specifygeometrysetup,Splitthecarintoseparatesurfacestoo

9、.RightclickonFacesandselectSplitNon-Contiguousfromcontextmenu.Clickonthenamesofthethreenewlycreatedsurfacestohighlighttheirgeometryinthescene.SelectthetwowheelsusingCTRL,thenrightclickandselectCombinetogatherthemunderthesameboundary.RenamethewheelsasWheelsandthecarasBody.,54,Transferofgeometryelemen

10、ts,STAR-CCM+separatesgeometrypartsfromsimulationrelevantregions.Simulationrelevantpartsneedtobetransferredintotheregionsfolder.Selectwind_tunnelAssignPartstoRegionsModes:Oneregionperpart.Oneboundaryperpartsurface.ClickCreateRegionsandClose.,55,Defineboundaryconditions,Theboundarytypeaffectsthemeshin

11、g.GotoRegions.SelecteachboundaryandsetitsTypeinthePropertieswindowfollowingthetablebelow.,56,Selectmeshmodels,Selectthemeshingmodels,STAR-CCM+loadsadditionalfunctionalityonlyifrequired.GotoPartswind_tunnel.RightclickandselectCreateMeshOperationAutomatedMesh.Checkthatwind_tunnelisselectedforPartsands

12、electthemodels:SurfaceRemesher.TrimmedCellMesher.PrismLayerMesher.ClickOK.AnewentryappearsunderOperations.Theyellowexclamationmarkindicatesthatthisoperationhasnotbeenexecutedyet.,57,Defaultmeshsettings,Makethedefaultmeshsettings.GotoOperationsAutomatedMesh.UnderDefaultControlsset:BaseSize:0.25m.Pris

13、mLayerTotalThicknessRelativeSize:10%.,58,Generatemesh,Startthemeshingpipeline.GotoOperationsAutomatedMesh.RightclickandselectExecute.OrpresstheGenerateVolumeMeshbuttoninthetoolbar.STAR-CCM+automaticallygeneratesasurfacemesh,thenavolumemeshwithprismlayersonthewalls.Theexclamationmarkdisappearsandanew

14、nodeisaddedtoContinua:PartsMeshes.,59,Generatemesh,Inanewscenethemeshisvisualized.Createanewmeshscene.RightclickontheScenesNewSceneMesh.OrusetheCreate/OpenScenesbuttoninthevistoolbar:Makethescenetransparent.,60,VisualizeMesh,Changetheview.PressTonyourkeyboard.ThisisashortcutforTopviewinz-direction.M

15、akeviewparallel.Clickonthecameraicon.SelectProjectionParallel.Createasectionplanethroughthewheels.Inthevistoolbarclickonthefxicon.Drawalineinthesceneasshowninthepicture.ChoosetoselectaNewGeometryDisplayer.,61,VisualizeMesh,Changethepositionofthesectionplaneifitdoesntcutthroughthewheel.GotoDerivedPar

16、tsplanesection.InthepropertieswindowofSinglesectionclickontheOffsetvalue.Asliderappearsandallowstoadjustthepositioninteractively.,62,VisualizeMesh,HidedisplayerMesh1.Gotothescene/plotpanel.RightclickDisplayersMesh1ToggleVisibility.MakemeshvisiblefordisplayerSectionGeometry1.ClickonDisplayersSectionG

17、eometry1.InthepropertieswindowclickontheMeshcheckbox.ExpandtheSectionGeometry1Partsfolder.RightclickplanesectionAlignViewtoPartNormal.,63,Settingthephysics,Choosethephysicsmodels.RightclickonPhysics1undertheContinuanode.ChooseSelectmodels.InthePhysicsModelSelectiondialog,select:Steady,Gas,Segregated

18、Flow,IdealGas,SegregatedFluidTemperature,Turbulent,K-EpsilonTurbulence,CellQualityRemediation.,64,Settingthesimulationconditions,Wewanttosetanairflowvelocityinthewindtunnelof15m/s.GotoRegionswind_tunnel.OpenfolderBoundariesInletPhysicsValuesVelocityMagnitude.ClickonConstantandsetthevelocityvalueto15

19、m/sinthePropertieswindow.,65,Settingthestoppingcriteria,Decreasethemaximumsteps.GotoStoppingCriteria.SetMaximumStepsto200(350iftimeallowsit)inthePropertieswindow.,66,Postprocessing,Viewthepressurefieldwhilethesolutionisrunning.Createanewscalarscene.Gotothescene/plotpanelandclickonthefollowingentries

20、ofDisplayersScalar1.ChangethesettingsinthePropertieswindow.Scalar1:ContourStyleSmoothFilled.Partsfolder:SelectRegionswind_tunnelBody,SymmetryandWheels.ScalarField:FunctionPressure.,67,Running,Runthesimulationuntilthestoppingcriterionisreached.Arrangetheresidualplotandscalarscenesothatbotharevisible.

21、ClickontheRunbuttononthetopofthetoolbar:Savesimulationaftertherunhasstopped.Theflowsolutioncanbepostprocessedfurther,thisiscoveredinthenextsection.,68,Summaryandreview,STAR-CCM+workflow:FromCADimporttosolutioninonepackage.Importgeometry.Defineboundaryconditions.Generatemesh.Definephysics.Setupanalys

22、is.Runcase.Therestoftheexamplesinthiscoursegivemoredetailsonthevariousstagesoftheworkflow.,69,Summaryandreview,Wheredoyouspecifythestandardmeshmodelsrequired?UnderGeometryOperations.Wheredoyouspecifythephysicsmodelsrequired?UnderContinuaPhysics.Howdoyouspecifyaboundaryasavelocityinlet?SelecttheboundaryandchangethetypeinthepropertieswindowWhydoyoucreatepostprocessingbeforerunningtheflowsolution?Soyoucanmonitorthesolutionwhileitisrunning.Whydoyouseparatethegeometrysetupfromtheregions?Soyougainamoreflexiblegeometricsetupandfacilitatetem