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Numerical analyses of ventilated cavitation over a 2-D NACA0015 hydrofoil using two turbulence modeling methods

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Abstract

The present paper studies the ventilated cavitation over a NACA0015 hydrofoil by numerical methods. The corresponding cavity evolutions are obtained at three ventilation rates by using the level set method. To depict the complicated turbulent flow structure, the filter-based density corrected model (FBDCM) and the modified partially-averaged Navier-Stokes (MPANS) model are applied in the present numerical analyses. It is indicated that the predicted results of the cavitation shedding dynamics by both turbulence models agree fairly well with the experimental data. It is also noted that the shedding frequency and the super cavity length predicted by the MPANS method are closer to the experiment data as compared to that predicted by the FBDCM model. The simulation results show that in the ventilated cavitation, the vapor cavity and the air cavity have the same shedding frequency. As the ventilated rate increases, the vapor cavity is depressed rapidly. The cavitation-vortex interaction in the ventilated cavitation is studied based on the vorticity transport equation (VTE) and the Lagrangian coherent structure (LCS). Those results demonstrate that the vortex dilatation and baroclinic torque terms are highly dependent on the evolution of the cavitation. In addition, from the LCSs and the tracer particles in the flow field, one may see the process from the attached cavity to the cloud cavity.

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Acknowledgements

This work was supported by the Beijing Key Laboratory Development Project (Grant No. Z151100001615006), the Science and Technology on Water Jet Propulsion Laboratory (Grant No. 61422230103162223004) and the State Key Laboratory for Hydroscience and Engineering, Tsinghua University (Grant No. sklhse-2017-E-02).

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Authors and Affiliations

  1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China

    Dan-dan Yang  (杨丹丹), An Yu  (于安) & Xian-wu Luo  (罗先武)

  2. Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China

    Dan-dan Yang  (杨丹丹), An Yu  (于安) & Xian-wu Luo  (罗先武)

  3. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    Bin Ji  (季斌)

  4. Marine Design and Research Institute of China, Shanghai, 200011, China

    Jia-jian Zhou  (周加建)

Authors
  1. Dan-dan Yang  (杨丹丹)
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  2. An Yu  (于安)
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  3. Bin Ji  (季斌)
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  4. Jia-jian Zhou  (周加建)
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  5. Xian-wu Luo  (罗先武)
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Corresponding author

Correspondence to Xian-wu Luo  (罗先武).

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 51536008).

Biography: Dan-dan Yang (1993-), Female, Ph. D. candidate

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Yang, Dd., Yu, A., Ji, B. et al. Numerical analyses of ventilated cavitation over a 2-D NACA0015 hydrofoil using two turbulence modeling methods. J Hydrodyn 30, 345–356 (2018). https://doi.org/10.1007/s42241-018-0032-7

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  • DOI: https://doi.org/10.1007/s42241-018-0032-7

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