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    Near-Wall Modeling of Plane Turbulent Wall Jets

    Source: Journal of Fluids Engineering:;1997:;volume( 119 ):;issue: 002::page 304
    Author:
    G. Gerodimos
    ,
    R. M. C. So
    DOI: 10.1115/1.2819135
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In most two-dimensional simple turbulent flows, the location of zero shear usually coincides with that of vanishing mean velocity gradient. However, such is not the case for plane turbulent wall jets. This could be due to the fact that the driving potential is the jet exit momentum, which gives rise to an outer region that resembles a free jet and an inner layer that is similar to a boundary layer. The interaction of a free-jet like flow with a boundary-layer type flow distinguishes the plane wall jet from other simple flows. Consequently, in the past, two-equation turbulence models are seldom able to predict the jet spread correctly. The present study investigates the appropriateness of two-equation modeling; particularly the importance of near-wall modeling and the validity of the equilibrium turbulence assumption. An improved near-wall model and three others are analyzed and their predictions are compared with recent measurements of plane wall jets. The jet spread is calculated correctly by the improved model, which is able to replicate the mixing behavior between the outer jet-like and inner wall layer and is asymptotically consistent. Good agreement with other measured quantities is also obtained. However, other near-wall models tested are also capable of reproducing the Reynolds-number effects of plane wall jets, but their predictions of the jet spread are incorrect.
    keyword(s): Turbulence , Jets , Modeling , Flow (Dynamics) , Boundary layers , Equations , Gradients , Momentum , Measurement , Reynolds number , Equilibrium (Physics) AND Shear (Mechanics) ,
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      Near-Wall Modeling of Plane Turbulent Wall Jets

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    contributor authorG. Gerodimos
    contributor authorR. M. C. So
    date accessioned2017-05-08T23:53:54Z
    date available2017-05-08T23:53:54Z
    date copyrightJune, 1997
    date issued1997
    identifier issn0098-2202
    identifier otherJFEGA4-27118#304_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/118925
    description abstractIn most two-dimensional simple turbulent flows, the location of zero shear usually coincides with that of vanishing mean velocity gradient. However, such is not the case for plane turbulent wall jets. This could be due to the fact that the driving potential is the jet exit momentum, which gives rise to an outer region that resembles a free jet and an inner layer that is similar to a boundary layer. The interaction of a free-jet like flow with a boundary-layer type flow distinguishes the plane wall jet from other simple flows. Consequently, in the past, two-equation turbulence models are seldom able to predict the jet spread correctly. The present study investigates the appropriateness of two-equation modeling; particularly the importance of near-wall modeling and the validity of the equilibrium turbulence assumption. An improved near-wall model and three others are analyzed and their predictions are compared with recent measurements of plane wall jets. The jet spread is calculated correctly by the improved model, which is able to replicate the mixing behavior between the outer jet-like and inner wall layer and is asymptotically consistent. Good agreement with other measured quantities is also obtained. However, other near-wall models tested are also capable of reproducing the Reynolds-number effects of plane wall jets, but their predictions of the jet spread are incorrect.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNear-Wall Modeling of Plane Turbulent Wall Jets
    typeJournal Paper
    journal volume119
    journal issue2
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2819135
    journal fristpage304
    journal lastpage313
    identifier eissn1528-901X
    keywordsTurbulence
    keywordsJets
    keywordsModeling
    keywordsFlow (Dynamics)
    keywordsBoundary layers
    keywordsEquations
    keywordsGradients
    keywordsMomentum
    keywordsMeasurement
    keywordsReynolds number
    keywordsEquilibrium (Physics) AND Shear (Mechanics)
    treeJournal of Fluids Engineering:;1997:;volume( 119 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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