Numerical investigation of air-entrainment in skimming flow over stepped spillways-中国Betway体育网页登陆

摘要 Asawidelyusedfloodenergydissipator,thesteppedspillwaycansignificantlydissipatethekineticorhydraulicenergyduetotheair-entrainmentinskimmingflowoverthesteps.Thefree-surfaceaerationinvolvesthesharpdeformationofthefreesurfaceandthecomplexturbulentshearflows.Inthisstudy,thevolumeoffluid(VOF),mixture,andEulerianmethodsareutilizedtosimulatetheair-entrainmentbycouplingwiththeReynolds-averagedNavier–Stokes/largeeddysimulation(RANS/LES)turbulencemodels.Thefreesurfacedeformation,airvolumefraction,pressure,andvelocityarecomparedforthethreedifferentnumericalmethods.OnlytheEulerian+RANSmethodfailstocapturethefree-surfaceaeration.TheairvolumefractionpredictedbytheVOF+LESmethodbestmatchestheexperimentalmeasurement,whilethemixture+LESmethodpredictstheinceptionpointoftheairentrainmentmoreaccurately.

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Numerical investigation of air-entrainment in skimming flow over stepped spillways

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