CFD湍流模型使用技巧培训

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1、•CFD湍流模型使用技巧培训CFD湍流模型使用技巧培训目录ANSYSCFD湍流模型新发展ANSYSCFD湍流模型使用技巧ANSYSCFD湍流模型验证案例FlowSeparationFlowReattachmentCornerVorticesMixing/combustion图片大图TransitionVorticalFlowsNASAX-29UnsteadyEffectsANSYSCFD湍流模型新发展RANSmodellingkeytoindustrialCFDLaminar-turbulentTransitionmodellingScale-ResolvingSimulation(SR

2、S)SAS–globallyunstableflowsDDES–globallyandlocallyunstableflowsELES/WMLESmarginallyunstableflowsANSYSFluent湍流模型One-EquationModelIncreaseinSpalart-AllmarascomputationalcostTwo-EquationModelsStandardk–εRNGk–εRealizablek–εRANSModelsStandardk–ωSSTk–ωk-kl-wTransitionModel(3eq.)SSTTransitionModel(4eq.)

3、4-Equationv2fModelReynoldsStressModelDetachedEddySimulationDES/SASLargeEddySimulationANSYSCFX湍流模型AlargenumberofturbulencemodelsareavailableinCFX,somehaveveryspecificapplicationswhileotherscanbeappliedtoawiderclassofflowswithareasonabledegreeofconfidenceRANSEddy-viscosityModels:RANSReynolds-StressMod

4、els:ZeroEquationmodel.LRRReynoldsStressSAmodelQIReynoldsStressStandardk-εmodel.Speziale,SarkarandGatskiReynoldsStressRNGk-εmodel.SMC-ωmodelStandardk-ωmodel.Baseline(BSL)Reynolds'StressmodelBaseline(BSL)zonalk-ωbasedmodel.SSTzonalk-ωbasedmodel.EddySimulationModels:(k-ε)1Emodel.LargeEddy

5、Simulation(LES)[transient]DetachedEddySimulation(DES)*ScaleAdaptiveSimulationSST(SAS)**NotavailableintheANSYSCFD-FloproductIntegrationPlatformw-equation2-equationmodelsTransitionModel•g-Remodel•k-w,BSL,SSTQUnsteadymodelsw-equationWallTreatment•SST-SAS•Automaticwalltreatment•SST-DESExtensionsHighero

6、rdermodels•Stagnationpoint•EARSM–w•Curvaturecorrection•Roughwalls•SMC-w•ReattachmentcorrectionMenter’sSSTk-wModelThetwosetsofequationsandthemodelconstantsareblendedinsuchawaythattheresultingequationsettransitionssmoothlyfromoneequationtoanother.4FtanhargDkDk11F1F11k5004

7、kDtinnerDtouterargminmax,,w21*wyy2wCDy2F1Fkw1112where,,,g1kw20kwCDkwmax2w2,10wxxjjk-wmodeltransformedfromstd.k-32modelF1intheinnerlayerk1F0intheo