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Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification

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Abstract

In the present paper, the unsteady cavitating turbulent flow over the twisted NACA66 hydrofoil is investigated based on an modified shear stress transfer k - ω partially averaged Navier-Stokes (MSST PANS) model, i.e., new MSST PANS (NMSST PANS) model, where the production term of kinetic energy in the turbulence model is modified with helicity. Compared with the experimental data, cavitation evolution and its characteristic frequency are satisfactorily predicted by the proposed NMSST PANS model. It is revealed that the interaction among the main flow, the reentrant jets, and sheet cavitation causes the formation of the primary shedding cavity near the mid-span and the secondary shedding cavity at each side of the twisted hydrofoil, and further induces the remarkable pressure gradient around shedding cavities. Along with the development of the primary and the secondary shedding cavities, the great pressure gradient associated with large cavity volume variation promotes the vortical flow generation and the spatial deformation of vortex structure during cavitation evolution, and results in the primary and the secondary U-type vortices. Further, dynamic mode decomposition (DMD) analysis is utilized to confirm the interaction among the main flow, the main reentrant jet and two side reentrant jets, and cavitation. These results indicate that the proposed NMSST PANS model is suitable to simulate the complicated cavitating turbulent flow for various engineering applications.

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Acknowledgments

This work was supported by the Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences (Grant No. LSU-KFJJ-2021-04), the Tsinghua National Laboratory for Information Science and Technology.

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Authors and Affiliations

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

    Chen Geng, Zhao-hui Qian, Ke-xin Zheng & Xian-wu Luo

  2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China

    Wei-xiang Ye

Authors
  1. Chen Geng
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  2. Zhao-hui Qian
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  3. Ke-xin Zheng
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  4. Wei-xiang Ye
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  5. Xian-wu Luo
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Correspondence to Xian-wu Luo.

Ethics declarations

Conflict of interest: The authors declare that they have no conflict of interest. Xian-wu Luo is editorial board member for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.

Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent: Not application.

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 52336001).

Biography: Chen Geng (1996-), Male, Ph. D. Candidate, E-mail: gc18@mails.tsinghua.edu.cn

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Geng, C., Qian, Zh., Zheng, Kx. et al. Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification. J Hydrodyn (2024). https://doi.org/10.1007/s42241-024-0020-z

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  • DOI: https://doi.org/10.1007/s42241-024-0020-z

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