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    Numerical Simulation of Cavitation Around a Hydrofoil and Evaluation of a RNG κ-ε Model

    Source: Journal of Fluids Engineering:;2008:;volume( 130 ):;issue: 001::page 11302
    Author:
    Lingjiu Zhou
    ,
    Zhengwei Wang
    DOI: 10.1115/1.2816009
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Cavitating flow around a hydrofoil was simulated using a transport equation-based model with consideration of the influence of noncondensable gases. The cavity length and the pressure distributions on the suction side can be well predicted for stable cavities using the standard renormalization-group (RNG) κ-ε turbulence model with proper noncondensable gas mass fraction. The unstable cavity shedding at lower cavitation numbers was not well predicted by the standard RNG κ-ε turbulence model. A modified RNG κ-ε turbulence model was evaluated by comparing the calculated spatial-temporal pressure distributions on the suction wall with experimental data. The results showed that the predicted cavity growth and shedding cycle and its frequency agree well with the experimental data. However, the pressure increase caused by interaction of the reentrant flow and the cavity interface is overestimated, which caused the time-averaged pressure on the front part of the hydrofoil to be overestimated. The time-averaged pressure on the rear of the hydrofoil was low because the small cavity shedding on the rear part of the cavity was not predicted.
    keyword(s): Pressure , Flow (Dynamics) , Turbulence , Cavitation , Cavities , Equations , Hydrofoil , Suction , Vapors AND Computer simulation ,
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      Numerical Simulation of Cavitation Around a Hydrofoil and Evaluation of a RNG κ-ε Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/138299
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    contributor authorLingjiu Zhou
    contributor authorZhengwei Wang
    date accessioned2017-05-09T00:28:38Z
    date available2017-05-09T00:28:38Z
    date copyrightJanuary, 2008
    date issued2008
    identifier issn0098-2202
    identifier otherJFEGA4-27289#011302_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138299
    description abstractCavitating flow around a hydrofoil was simulated using a transport equation-based model with consideration of the influence of noncondensable gases. The cavity length and the pressure distributions on the suction side can be well predicted for stable cavities using the standard renormalization-group (RNG) κ-ε turbulence model with proper noncondensable gas mass fraction. The unstable cavity shedding at lower cavitation numbers was not well predicted by the standard RNG κ-ε turbulence model. A modified RNG κ-ε turbulence model was evaluated by comparing the calculated spatial-temporal pressure distributions on the suction wall with experimental data. The results showed that the predicted cavity growth and shedding cycle and its frequency agree well with the experimental data. However, the pressure increase caused by interaction of the reentrant flow and the cavity interface is overestimated, which caused the time-averaged pressure on the front part of the hydrofoil to be overestimated. The time-averaged pressure on the rear of the hydrofoil was low because the small cavity shedding on the rear part of the cavity was not predicted.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNumerical Simulation of Cavitation Around a Hydrofoil and Evaluation of a RNG κ-ε Model
    typeJournal Paper
    journal volume130
    journal issue1
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2816009
    journal fristpage11302
    identifier eissn1528-901X
    keywordsPressure
    keywordsFlow (Dynamics)
    keywordsTurbulence
    keywordsCavitation
    keywordsCavities
    keywordsEquations
    keywordsHydrofoil
    keywordsSuction
    keywordsVapors AND Computer simulation
    treeJournal of Fluids Engineering:;2008:;volume( 130 ):;issue: 001
    contenttypeFulltext
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