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1、2008InternationalANSYSConferenceParticulatemodelinginANSYSCFDJeffMaandMohanSrinivasaANSYSInc.©2008ANSYS,Inc.Allrightsreserved.1ANSYS,Inc.ProprietaryAgenda•SummarizeandillustrateapproachesformodelingparticulatemediainANSYSCFDproducts•Highlightaspectsthat
2、helpincustomizingandextendingthemodelsavailableinFluentandCFX©2008ANSYS,Inc.Allrightsreserved.2ANSYS,Inc.ProprietaryIntroduction•Rheologyofacollectionofparticlesorgrains•Complexmechanicalbehavior–Fluidlike–pneumatictransport,fluidizedbeds–Solidlike–heap
3、s,foundations•Mainfactorsgoverningbehavior–Volumefraction–Shearrates–Influenceoffluid©2008ANSYS,Inc.Allrightsreserved.3ANSYS,Inc.ProprietaryOverviewofmodelingapproachesLagrangianmodelsEulerianGranularTrajectoriesofContinuummodelParticleMotionindividualp
4、articles(multidimensional)FlowaroundFluidMotionindividualparticlesorlocalaveragingLocalaveragingConceptillustrationborrowedfromProf.TsujiPresentationatWCPT5,April2006©2008ANSYS,Inc.Allrightsreserved.4ANSYS,Inc.ProprietaryGranularmodelsavailableinANSYS•T
5、wofluidmodels–Euler-granular–Euler-granularwithfrictionalviscosityfordensephase•Particlemodels–DPMfordilutephase(steadyandtimedependent)–Particletrackingmodelwithaprobabilisticcollisionmodel–DensephaseDPM(DP-DPM)fordenseflowswithlargesizedistributions(U
6、DF)–MacroscopicParticleModel(MPM)forlargeparticles(UDF)©2008ANSYS,Inc.Allrightsreserved.5ANSYS,Inc.ProprietaryParticletoCouplingAdditionalParticleOrderof#Computationparticlewithcont.physics&shape,sizeofspeed&interactionsphasechemistrydistributionparticl
7、esparallelizationArbitraryStronglyDirectcontactandNoneor(clustereddependenton#Not5DEMotherforcesthroughext.spheres)~10ofparticles,notimplementedimplementationCFDcodeshape¶llelized,Rel.distributionslowCoupledwith6Collisions&breakupCorrelation-~10alls
8、td.FluentSphericalandVeryfast,DPMindirectly;packingbaseddragmodels,easyellipsoidalparallelizedlimitnotaccountedforcetocustomizeParticlesareCoupledwithSpherical,NolimitonRel.fast,affectedCorrelation-representedbyallstd.Fluentarbit
