CFX_Multiphase_12.0_WS05_Lagrangian_Particle_Track

WS5-1ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#CFXMultiphase12.0Workshop5U-BendwithLagrangianParticleTrackingWS5:U-BendwithLagrangianParticleTrackingWS5-2ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementIntroduction•ThisexampledemonstratestheuseofLagrangianparticletrackinginANSYSCFX.Thismodelstruemultiphaseflowandisvalidforsystemswhereparticlesarepresentatlowvolumeloadings(10%)•Inordertoshortenrun-time,atwo-dimensionalplanarmeshisused•Thisexamplefeatures:–Lagrangianparticletracking–BuoyantflowWS5:U-BendwithLagrangianParticleTrackingWS5-3ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementBackgroundDepositionWallsInletFlowGravity•Inthisexample,particlesofdifferentsizesaremodeledasdiscretemovingpointsusingtheLagrangianparticletrackingmodel.•Depositionwallsforparticlescanbedefinedbysettingthenormalcoefficientofrestitutiontozerosothatparticlesstickonthewallwhentheyhitit.•Flowthrougharectangularductwitha90°bendismodeled.Gravityactsdownward.•Particleswithdiametersof1,10,and100micronsaremodeled.•ThisexamplemodelsthesamesystemandphysicsastheAlgebraicSlipworkshopbutwithintheLagrangianParticletrackingframeworkWS5:U-BendwithLagrangianParticleTrackingWS5-4ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementComputationalMesh•Themeshisonecellthickinthez-direction(thethicknessextentis0.1in)WS5:U-BendwithLagrangianParticleTrackingWS5-5ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementImportingtheMesh•CopythefileCFXgtmfilehex.gtmfromtheinputfilesfolderintoaworkingdirectory•StartCFX-PrefromtheANSYSCFXLauncher.•Createanewsimulation(File/NewCase/General).Right-clickonMeshintheOutlineandimportthehex.gtmfileintothesimulationsettingthetypetoCFXMesh.WS5:U-BendwithLagrangianParticleTrackingWS5-6ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementImportedMeshWS5:U-BendwithLagrangianParticleTrackingWS5-7ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementContinuousandDispersedPhaseMaterials•Youwilldefinethreedispersedphasefluiddefinitions(small,medium,andlarge)tomodelthesmall,medium,andlargeparticles•Clickonthe+signnexttoMaterialsintheTreeViewandfindtheconstantpropertyliquidnamedWater.•ThismaterialwillbeusedtosetthepropertiesoftheparticleswhilethecontinuousphasepropertieswillbereferencedtothematerialAirat25CWS5:U-BendwithLagrangianParticleTrackingWS5-8ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementDefiningtheContinuousPhaseDomainFluid•Double-clicktheDefaultDomaincreatedforyourimportedmeshtoeditit(ifadefaultdomainwasnotcreated,createone).•OntheBasicSettingstaboftheDetailsformforthedomain:–SettheDomainTypetoFluidDomain–HighlightFluid1intheFluidandParticleDefinitionwindowandclickontheDeleteicontoremoveit–ClickontheNewiconintheFluidandParticledefinitionwindowandinsertanewfluidnamedair–SelectthepredefinedconstantpropertymaterialAirat25CandsettheMorphologyOptiontoContinuousFluidWS5:U-BendwithLagrangianParticleTrackingWS5-9ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementDefiningtheDispersedPhaseFluidsmall•OntheBasicSettingstaboftheDetailsformforthedomain:–ClickontheNewiconintheFluidandParticledefinitionwindowandinsertanewfluidnamedsmall–SelectthepredefinedconstantpropertymaterialWaterandsettheMorphologyOptiontoParticleTransportFluid–EnablethetoggleforParticleDiameterDistribution,settheOptiontoSpecifiedDiameterandenteraDiameterof1e-6[m]WS5:U-BendwithLagrangianParticleTrackingWS5-10ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementDefiningtheDispersedPhaseFluidmedium•OntheBasicSettingstaboftheDetailsformforthedomain:–ClickontheNewiconintheFluidandParticledefinitionwindowandinsertanewfluidnamedmedium–SelectthepredefinedconstantpropertymaterialWaterandsettheMorphologyOptiontoParticleTransportFluid–EnablethetoggleforParticleDiameterDistribution,settheOptiontoSpecifiedDiameterandenteraDiameterof1e-5[m]WS5:U-BendwithLagrangianParticleTrackingWS5-11ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementDefiningtheDispersedPhaseFluidlarge•OntheBasicSettingstaboftheDetailsformforthedomain:–ClickontheNewiconintheFluidandParticledefinitionwindowandinsertanewfluidnamedlarge–SelectthepredefinedconstantpropertymaterialWaterandsettheMorphologyOptiontoParticleTransportFluid–EnablethetoggleforParticleDiameterDistribution,settheOptiontoSpecifiedDiameterandenteraDiameterof1e-4[m]WS5:U-BendwithLagrangianParticleTrackingWS5-12ANSYS,Inc.Proprietary©2009ANSYS,Inc.Allrightsreserved.September1,2009Inventory#WorkshopSupplementSettingtheBuoyancyProperties•OntheBasicSettingstabunderDomainModels:–SettheBuoyancyOptiontoBuoyantwithagravityvectorof(9.81,0,0[m/s^2])andaBuoyancyRefer