CFX_离心泵算例

ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WS5-1April28,2009Inventory#002599Workshop5CavitatingCentrifugalPumpIntroductiontoCFXANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-2April28,2009Inventory#002599IntroductionThePurposeofthetutorialistomodelcavitationinacentrifugalpump,whichinvolvestheuseofarotationdomainandthecavitationmodel.Theproblemconsistsofafivebladecentrifugalpumpoperatingat2160rpm.Theworkingfluidiswaterandflowisassumedtobesteadyandincompressible.Duetorotationalperiodicityasinglebladepassagewillbemodeled.Theinitialflow-fieldwillbesolvedwithoutcavitation.Itwillbeturnedonlater.ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-3April28,2009Inventory#0025991.StartWorkbenchandsavetheprojectascentrifugalpump.wbpj2.DragCFXintotheProjectSchematicfromtheComponentSystemstoolbox3.StartCFX-PrebydoubleclickingSetup4.WhenCFX-Preopens,importthemeshbyright-clickingonMeshandselectingImportMeshICEMCFD5.Browsetopump.cfx56.KeepMeshunitsinm7.ClickOpenWorkbenchANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-4April28,2009Inventory#002599Modifyingthematerialproperties:1.ExpandMaterialsintheOutlinetree2.Double-clickWater3.OntheMaterialPropertiestabchangeDensityto1000[kg/m3]4.ChangeDynamicViscosityto0.001[kgm^-1s^-1]underTransportProperties5.ClickOKCreatingWorkingFluidsANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-5April28,2009Inventory#002599SettinguptheFluidDomain1.Double-clickonDefaultDomain2.UnderFluidandParticleDefinitions,deleteFluid1andthencreateanewFluidnamedWaterLiquid3.SetMaterialtoWater4.CreateanothernewFluidnamedWaterVapour5.NexttotheMaterialdrop-downlist,clickthe“…”icon,thentheImportLibraryDataicon(ontherightoftheform),andselectWaterVapourat25CundertheWaterDataobject–ClickOK6.BackintheMaterialpanel,selectWaterVapourat25C–ClickOKANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-6April28,2009Inventory#002599SettinguptheFluidDomain7.SettheReferencePressureto0[Pa]8.SetDomainMotiontoRotating9.SetAngularVelocityto2160[revmin^-1]10.SwitchonAlternateRotationModel11.MakesureRotationAxisunderAxisDefinitionissettoGlobalZ11.SwitchtotheFluidModelstab,andsetthefollowing:12.TurnonHomogeneousModelintheMultiphasesection13.UnderHeatTransfersettheOptiontoIsothermal,withaTemperatureof25C14.SetTurbulenceOptiontoShearStressTransport15.ClickOKANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-7April28,2009Inventory#002599InletBoundaryCondition1.InsertaboundaryconditionnamedInlet2.OntheBasicSettingstab,setBoundaryTypetoInlet3.SetLocationtoINLET4.SetFrameTypetoStationary5.SwitchtotheBoundaryDetailstab6.SpecifyMassandMomentumwithaNormalSpeedof7.0455[m/s]7.SwitchtotheFluidValuestab8.ForWaterLiquid,settheVolumeFractiontoaValueof19.ForWaterVapour,settheVolumeFractiontoaValueof010.ClickOKANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-8April28,2009Inventory#002599OutletBoundaryCondition1.InsetaboundaryconditionnamedOutlet2.OntheBasicSettingstab,setBoundaryTypetoOpening3.SetLocationtoOUT4.SetFrameTypetoStationary5.SwitchtotheBoundaryDetailstab6.SpecifyMassandMomentumusingEntrainment,andenteraRelativePressureof600,000[Pa]7.EnablethePressureOptionandsetittoOpeningPressure8.SetTurbulenceOptiontoZeroGradient9.SwitchtotheFluidValuestab10.ForWaterLiquid,settheVolumeFractiontoaValueof111.ForWaterVapour,settheVolumeFractiontoaValueof012.ClickOKANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-9April28,2009Inventory#002599PeriodicInterface1.ClicktocreateanInterface,andnameitPeriodic2.SettheInterfaceTypetoFluidFluid3.ForInterfaceSide1,settheRegionListtoDOMAININTERFACE1SIDE1andDOMAININTERFACE2SIDE1(usethe“…”iconandtheCtrlkey)4.ForInterfaceSide2,settheRegionListtoDOMAININTERFACE1SIDE2andDOMAININTERFACE2SIDE25.SettheInterfaceModelsoptiontoRotationalPeriodicity6.UnderAxisDefinition,selectGlobalZ7.SetMeshConnectionOptionto1:18.ClickOKANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-10April28,2009Inventory#002599WallBoundaryConditions1.InsertaboundaryconditionnamedStationary2.SetittobeaWall,usingtheSTATIONARYlocation3.OntheBoundaryDetailstab,enableaWallVelocityandsetittoCounterRotatingWall4.ClickOK5.IntheOutlineTree,right-clickontheDefaultDomainDefaultboundaryandrenameittoMoving–ThedefaultbehaviorfortheMovingboundaryconditionistomovewiththerotatingdomain,sothereisnothingthatneedstobesetANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.WorkshopSupplementWS5:CavitatingCentrifugalPumpWS5-11April28,2009Inventory#002599Initialization1.Clicktoinitializethesolution2.OntheFluidSettingsform,setWaterLiquidVolumeFractiontoAutomaticwithValue,andsettheVo