Effects of finite-size neutrally buoyant particles on the turbulent channel flow at a Reynolds number of 395-中国Betway体育网页登陆

摘要 Adirect-forcingfictitiousdomain(DFFD)methodisusedtoperformfullyresolvednumericalsimulationsofturbulentchannelflowsladenwithlargeneutrallybuoyantparticles.Theeffectsoftheparticlesontheturbulence(includingthemeanvelocity,therootmeansquare(RMS)ofthevelocityfluctuation,theprobabilitydensityfunction(PDF)ofthevelocity,andthevortexstructures)atafrictionReynoldsnumberof395areinvestigated.Theresultsshowthatthedrag-reductioneffectcausedbyfinite-sizesphericalparticlesatlowparticlevolumesisnegligiblysmall.TheparticleeffectsontheRMSvelocitiesatReτ=395aresignificantlysmallerthanthoseatReτ=180,despitequalitativelythesameeffects,i.e.,thepresenceofparticlesdecreasesthemaximumstreamwiseRMSvelocitynearthewallviaweakeningthelarge-scalestreamwisevortices,andincreasesthetransverseandspanwiseRMSvelocitiesinthevicinityofthewallbyinducingsmaller-scalevortices.TheeffectsoftheparticlesonthePDFsofthefluidfluctuatingvelocitiesnormalizedwiththeRMSvelocitiesaresmall,regardlessoftheparticlesize,theparticlevolumefraction,andtheReynoldsnumber.

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Effects of finite-size neutrally buoyant particles on the turbulent channel flow at a Reynolds number of 395

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