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1、J.FluidJlech.(lil87),1'01.177.pp.1::-166p,.infPlIina'rea!BritainTurbulencestatisticsinfullydevelopedchannelflowatlowReynoldsnumberByJOHNKIM,PARVIZMOINANDROBERTMOSERNASAAmesResearchCenter,'IoffettField,CA.9-1.035.("SAAdirectnumericalsim[Ulationofatu
2、rbulentchannelflowisperformed.TheunsteadyXavier-StokesequatidnsaresolvednumericallyataReynoldsnumberof3300,basedonthemeancentrelinevelocityandchannelhalf-width,withabout4x106gridpoints(192x129x160inx,y,z).Allessentialturbulencescalesareresolvedontheco
3、m-putationalgridandnosubgridmodelisused.AlargenumberofturbulencestatisticsarecomputedandcomparedwiththeexistingexperimentaldataatcomparableReynoldsnumbers_Agreementsaswellasdiscrepanciesarediscussedindetail.Particularattentionisgivcntothebchaviouroftu
4、rbulencecorrelationsnearthewall.Inaddition,anumberofstatisticalcorrelationswhicharecomplementarytotheexistingexpcrimcntaldataarereportedforthefirsttime.1.IntroductionFullydevelopedehannelflowhasbeenstudiedextensivelytoincreasetheunderst,mdingofthemech
5、anicsofwall-boundedturbulentflows.Itsgeometricsimplicityisattradiveforbothexperimentalandtheoreticalinvestigationsofcomplexturbulenceinteractionsnearawall.Asarcsult,alargenumberofexperimentalandcomputationalstudiesofchannelflowhavebeencarriedout.Nikur
6、adse(1929)andHeichardt(19:38)wereamongthefirsttoinvestigatefullydevelopedturbulentchannelflow.Nikuradse'smeasurementswcrelimitedtothemeanflow;Reichardtreportedvelocityfluctuationsinthestreamwiseandnormal(tothewall)directions.Laufcr(19,')1)wasthefirstt
7、odocumentdetailedturbulencestatistics.Hismeasuremcntsweremadc,1tthreeReynolclHnumbers(12300,:30800,and61(jOO),basedonthemeancentrelincvelocityandthcchannelhalf-width.Comte-Bellot(19(j3)providcdthemostextensivedata,includingmanyhigher-orderstatisticssu
8、chastwo-pointeorrelations,encrgyspectra.skewnessandflatnessfactors.HermeasurementswercmadeovertheHeynolds-numberrange57000-230000.Clark(l!l68)rcportedadditionaldetailedinf()rmationinthcregionsverynearthewallovertheReynolds-numberrange15000-!56
