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首页> 外文期刊>Ocean Engineering >Numerical simulation of three dimensional cavitation shedding dynamics with special emphasis on cavitation-vortex interaction
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Numerical simulation of three dimensional cavitation shedding dynamics with special emphasis on cavitation-vortex interaction

机译：三维空化脱落动力学的数值模拟，特别强调空化-涡流相互作用

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摘要

Recent experiments showed that there is an interaction between the fluid vortex formation and cavitation, but the mechanism is still an open problem. In the present paper, the structure of the cavitating flow around a twisted hydrofoil was investigated numerically using the mass transfer cavitation model and the modified RNG k-ε model with a local density correction for turbulent eddy viscosity. The predicted three dimensional cavity structures and the shedding frequency agree fairly well with experimental observations. Three types of flow behavior along the suction side of the twisted hydrofoil are discussed. Further analysis of the flow field reveals that cavitation promotes vortex production and increases the boundary layer thickness with local separation and the flow unsteadiness. Finally, the influence of cavitation on the vorticity distribution is illustrated using the vorticity transport equation in a variable density flow and is demonstrated by the contribution of vortex stretching, vortex dilatation and baroclinic torque terms.
机译：最近的实验表明，流体涡流的形成与空化之间存在相互作用，但机理仍是一个悬而未决的问题。本文利用传质空化模型和改进的RNGk-ε模型，对湍流涡流黏度进行局部密度校正，对扭转水翼周围的空化流结构进行了数值研究。预测的三维空腔结构和脱落频率与实验观察结果非常吻合。讨论了扭曲水翼吸力侧的三种流动特性。对流场的进一步分析表明，空化促进了涡旋的产生并增加了边界层的厚度，并具有局部分离和流动不稳定的特性。最后，利用可变密度流中的涡度输运方程来说明空化对涡度分布的影响，并通过涡旋拉伸，涡旋扩张和斜压转矩项的贡献来证明。

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  • 来源
    《Ocean Engineering》 |2014年第1期|64-77|共14页
  • 作者

    Bin Ji; Xianwu Luo; Roger E.A. Arndt; Yulin Wu;

  • 作者单位

    State Key Laboratory of Hydroscience & Engineering, Tsinghua University, Beijing 100084, China;

    State Key Laboratory of Hydroscience & Engineering, Tsinghua University, Beijing 100084, China;

    Saint Anthony Falls Laboratory, University of Minnesota, Minneapolis, MN 55414, USA;

    State Key Laboratory of Hydroscience & Engineering, Tsinghua University, Beijing 100084, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cavitation; Homogeneous model; Hydrofoil; Vortical flow; 3D structure;

    机译：空化同类模型;水翼涡流3D结构;

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