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首页> 外文期刊>International Journal of Heat and Mass Transfer >Partially-Averaged Navier-Stokes method with modified k-s model for cavitating flow around a marine propeller in a non-uniform wake
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Partially-Averaged Navier-Stokes method with modified k-s model for cavitating flow around a marine propeller in a non-uniform wake

机译：具有修正k-s模型的部分平均Navier-Stokes方法，用于在非均匀尾流中空化螺旋桨周围的水流

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摘要

Unsteady cavitating turbulent flow simulations need to be responsible for both cavitation and turbulence modeling issues. The Partially-Averaged Navier-Stokes (PANS) computational model developed from the RANS method and the k-ε turbulence model are used to model turbulent cavitating flow with a mass transfer cavitation model in the present paper. An objective of this study is to pursue more accurate esti mates of unsteady cavitating flows with large-scale fluctuations at a reasonable cost. Firstly, the unsteady cavitating flow simulations over a NACA66-mod hydrofoil are performed using the PANS method with various values of the resolution control parameters (f_k = 1 ～ 0.2,f_εe= 1) to evaluate the numerical methods based on experimental data. The comparison with the experiments show that the numerical analysis with a f_k = 0.2 can predict the cavity evolution and shedding frequency fairly well. Then, cavitating flow around a marine propeller in non-uniform wake was simulated by PANS method. The calculations show that large cavity volume pulsation as the blade passes through the wake region is resolved better by the PANS method with f_k - 0.2 than by the RANS method with the k-s or k-ω SST turbulence models. This can be contributed to the fact that a smaller f_k, give larger cavity volume pulsations leading to increased cavity volume accelerations and larger pressure fluctuations above the propeller, while a larger f_k overestimates the turbulent viscosity along the rear part of the cavity. Finally, it is confirmed from the simulation by the PANS method with f_k - 0.2 that the whole process of cavitating flow evolution around the propeller in non-uniform wake can be very well reproduced including cavitation inception, sheet cavitation and tip vortex cavitation observed experimentally.
机译：不稳定的空化湍流模拟需要对空化和湍流建模问题负责。本文利用RANS方法和k-ε湍流模型建立的偏平均Navier-Stokes（PANS）计算模型，利用传质空化模型对湍流空化流进行建模。这项研究的目的是以合理的成本，寻找具有大范围波动的不稳定空化流的更准确估计。首先，使用PANS方法对各种分辨率控制参数值（f_k = 1〜0.2，f_εe= 1）进行NACA66-mod水翼上的非定常空化流模拟，以基于实验数据评估数值方法。与实验的比较表明，f_k = 0.2的数值分析可以很好地预测空腔的演化和脱落频率。然后，利用PANS方法模拟了非均匀尾流中螺旋桨周围的空化流。计算结果表明，采用f_k-0.2的PANS方法比采用k-s或k-ωSST湍流模型的RANS方法能更好地解决叶片穿过尾流区域时的大腔体容积脉动。这可以归因于以下事实：较小的f_k会导致较大的腔体容积脉动，从而导致增大的腔体容积加速度和螺旋桨上方的较大压力波动，而较大的f_k会高估沿腔体后部的湍流粘度。最后，通过f_k-0.2的PANS方法进行的仿真证实，在非均匀尾流中，螺旋桨周围的空化流演化的整个过程可以很好地重现，包括通过实验观察到的空化开始，薄层空化和尖端涡旋空化。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第24期|p.6582-6588|共7页
  • 作者

    Bin Ji; Xianwu Luo; Yulin Wu; Xiaoxing Peng; Hongyuan Xu;

  • 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;

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

    China Ship Scientific Research Center, Wuxi 214082, China;

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

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cavitating flow; PANS; marine propeller; non-uniform wake; pressure fluctuation;

    机译：空化流PANS;船用螺旋桨非均匀唤醒压力波动;

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