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1、多相流模型经验谈多相流的介绍：Currentlytherearetwoapproachesforthenumericalcalculationofmultiphaseflows:theEuler-LagrangeapproachandtheEuler-Eulerapproach.TheEuler-LagrangeApproach:TheLagrangiandiscretephasemodelinFLUENTfollowstheEuler-Lagrangeapproach,thisapproachi
2、sinappropriateforthemodelingofliquid-liquidmixtures,fluidizedbeds,oranyapplicationwherethevolumefractionofthesecondphaseisnotnegligible.TheEuler-EulerApproach:InFLUENT,threedifferentEuler-Eulermultiphasemodelsareavailable:thevolumeoffluid(VOF)model,th
3、emixturemodel,andtheEulerianmodel.1)TheVOFModel:itisdesignedfortwoormoreimmisciblefluidswherethepositionoftheinterfacebetweenthefluidsisofinterest.ApplicationsoftheVOFmodelincludestratifiedflows,free-surfaceflows,filling,sloshing,themotionoflargebubbl
4、esinaliquid,themotionofliquidafteradambreak,thepredictionofjetbreakup(surfacetension),andthesteadyortransienttrackingofanyliquid-gasinterface.2)Mixturemodel:Applicationsofthemixturemodelincludeparticle-ladenflowswithlowloading,bubblyflows,sedimentatio
5、n,andcycloneseparators.Themixturemodelcanalsobeusedwithoutrelativevelocitiesforthedispersedphasestomodelhomogeneousmultiphaseflow.3)ApplicationsoftheEulerianmultiphasemodelincludebubblecolumns,risers,particlesuspension,andfluidizedbeds.离散相模型（离散相的装载率10
6、～12%）求解参数的设定：OptionsforInteractionwithContinuousPhase：Forsteady-statesimulations,increasingtheNumberofContinuousPhaseIterationsperDPMIterationwillincreasestabilitybutrequiremoreiterationstoconverge.UpdateDPMSourcesEveryFlowIterationisrecommendedwhendo
7、ingunsteadysimulations;ateveryDPMIteration,theparticle可编辑word,供参考版！sourcetermsarerecalculated.LengthScale:controlstheintegrationtimestepsizeusedtointegratetheequationsofmotionfortheparticle.AsmallervaluefortheLengthScaleincreasestheaccuracyofthetrajec
8、toryandheat/masstransfercalculationsforthediscretephase.LengthScalefactor:AlargervaluefortheStepLengthFactordecreasesthediscretephaseintegrationtimestep.颗粒积分方法：numerics叶中trackingscheme选项1）implicitusesanimplicitEulerintegrationofEquation23.2-1w
