摘要
Wall-boundedturbulentflowinvolvesthedevelopmentofmulti-scaleturbulenteddies,aswellasasharplyvaryingboundarylayer.Itstheoreticaldescriptionsareyetphenomenological.Wepresenthereanewframeworkcalledstructuralensembledynamics(SED),whichaimsatusingsystematicallyallrelevantstatisticalpropertiesofturbulentstructuresforaquantitativedescriptionofensemblemeans.AnewsetofclosureequationsbasedontheSEDapproachforaturbulentchannelflowispresented.SEDorderfunctionsaredefined,andnumericallydeterminedfromdataofdirectnumericalsimulations(DNS).ComputationalresultsshowthatthenewclosuremodelreproducesaccuratelythesolutionoftheoriginalNavier-Stokessimulation,includingthemeanvelocityprofile,thekineticenergyofthestream-wisevelocitycomponent,andeverytermintheenergybudgetequation.ItissuggestedthattheSED-basedstudiesofturbulentstructurebuildsabridgebetweenthestudiesofphysicalmechanismsofturbulenceandthedevelopmentofaccuratemodelequationsforengineeringpredictions.
出版日期
2009年05月15日（中国期刊网平台首次上网日期，不代表论文的发表时间）
