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    Reynolds Number Effects in Wall-Bounded Turbulent Flows

    Source: Applied Mechanics Reviews:;1994:;volume( 047 ):;issue: 008::page 307
    Author:
    Mohamed Gad-el-Hak
    ,
    Promode R. Bandyopadhyay
    DOI: 10.1115/1.3111083
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper reviews the state of the art of Reynolds number effects in wall-bounded shear-flow turbulence, with particular emphasis on the canonical zero-pressure-gradient boundary layer and two-dimensional channel flow problems. The Reynolds numbers encountered in many practical situations are typically orders of magnitude higher than those studied computationally or even experimentally. High-Reynolds number research facilities are expensive to build and operate and the few existing are heavily scheduled with mostly developmental work. For wind tunnels, additional complications due to compressibility effects are introduced at high speeds. Full computational simulation of high-Reynolds number flows is beyond the reach of current capabilities. Understanding of turbulence and modeling will continue to play vital roles in the computation of high-Reynolds number practical flows using the Reynolds-averaged Navier-Stokes equations. Since the existing knowledge base, accumulated mostly through physical as well as numerical experiments, is skewed towards the low Reynolds numbers, the key question in such high-Reynolds number modeling as well as in devising novel flow control strategies is: what are the Reynolds number effects on the mean and statistical turbulence quantities and on the organized motions? Since the mean flow review of Coles (1962), the coherent structures, in low-Reynolds number wall-bounded flows, have been reviewed several times. However, the Reynolds number effects on the higher-order statistical turbulence quantities and on the coherent structures have not been reviewed thus far, and there are some unresolved aspects of the effects on even the mean flow at very high Reynolds numbers. Furthermore, a considerable volume of experimental and full-simulation data have been accumulated since 1962. The present article aims at further assimilation of those data, pointing to obvious gaps in the present state of knowledge and highlighting the misunderstood as well as the ill-understood aspects of Reynolds number effects.
    keyword(s): Turbulence , Reynolds number , Flow (Dynamics) , Simulation , Modeling , Computation , Flow control , Gradients , Wind tunnels , Shear flow , Navier-Stokes equations , Boundary layers , Channel flow , Motion , Pressure AND Compressibility ,
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      Reynolds Number Effects in Wall-Bounded Turbulent Flows

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    http://yetl.yabesh.ir/yetl1/handle/yetl/112967
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    contributor authorMohamed Gad-el-Hak
    contributor authorPromode R. Bandyopadhyay
    date accessioned2017-05-08T23:43:10Z
    date available2017-05-08T23:43:10Z
    date copyrightAugust, 1994
    date issued1994
    identifier issn0003-6900
    identifier otherAMREAD-25679#307_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/112967
    description abstractThis paper reviews the state of the art of Reynolds number effects in wall-bounded shear-flow turbulence, with particular emphasis on the canonical zero-pressure-gradient boundary layer and two-dimensional channel flow problems. The Reynolds numbers encountered in many practical situations are typically orders of magnitude higher than those studied computationally or even experimentally. High-Reynolds number research facilities are expensive to build and operate and the few existing are heavily scheduled with mostly developmental work. For wind tunnels, additional complications due to compressibility effects are introduced at high speeds. Full computational simulation of high-Reynolds number flows is beyond the reach of current capabilities. Understanding of turbulence and modeling will continue to play vital roles in the computation of high-Reynolds number practical flows using the Reynolds-averaged Navier-Stokes equations. Since the existing knowledge base, accumulated mostly through physical as well as numerical experiments, is skewed towards the low Reynolds numbers, the key question in such high-Reynolds number modeling as well as in devising novel flow control strategies is: what are the Reynolds number effects on the mean and statistical turbulence quantities and on the organized motions? Since the mean flow review of Coles (1962), the coherent structures, in low-Reynolds number wall-bounded flows, have been reviewed several times. However, the Reynolds number effects on the higher-order statistical turbulence quantities and on the coherent structures have not been reviewed thus far, and there are some unresolved aspects of the effects on even the mean flow at very high Reynolds numbers. Furthermore, a considerable volume of experimental and full-simulation data have been accumulated since 1962. The present article aims at further assimilation of those data, pointing to obvious gaps in the present state of knowledge and highlighting the misunderstood as well as the ill-understood aspects of Reynolds number effects.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleReynolds Number Effects in Wall-Bounded Turbulent Flows
    typeJournal Paper
    journal volume47
    journal issue8
    journal titleApplied Mechanics Reviews
    identifier doi10.1115/1.3111083
    journal fristpage307
    journal lastpage365
    identifier eissn0003-6900
    keywordsTurbulence
    keywordsReynolds number
    keywordsFlow (Dynamics)
    keywordsSimulation
    keywordsModeling
    keywordsComputation
    keywordsFlow control
    keywordsGradients
    keywordsWind tunnels
    keywordsShear flow
    keywordsNavier-Stokes equations
    keywordsBoundary layers
    keywordsChannel flow
    keywordsMotion
    keywordsPressure AND Compressibility
    treeApplied Mechanics Reviews:;1994:;volume( 047 ):;issue: 008
    contenttypeFulltext
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