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The structures of unsteady cavitation shedding flow around an axisymmetric body with a blunt headform

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Abstract

The objective of this paper is to investigate the cavity shedding dynamics in unsteady cavitating flows around an axisymmetric body with a blunt headform. A high-speed video camera is used to record the cavity evolution process. The numerical simulations are performed based on the homogenous method coupled with a modified PANS (Partially-averaged Navier-Stokes) turbulence model and Zwart cavitation model. The results show that the predicted time-evolution process of cavity agree fairly well with the corresponding experimental data for two different cavitation numbers (σ = 0.7 and σ = 0.6 ). Compared to that of σ = 0.6, the cavity shedding behavior of σ = 0.7 presents more fluctuations and instabilities. To elucidate the different shedding structures, the Lagrangian coherent structures (LCS) and particle trajectory methods are also utilized here. It is found that the particle tracers respectively demonstrate the cavity shedding behaviors of conjunction at σ = 0.6 and rolling up at σ = 0.7. Moreover, the LCS distributions vary with the timeevolution of vortex structures. The particle trajectories can illustrate the upstream and downstream vortex structures connect together at σ = 0.6 but separate at σ = 0.7, which highly consistent with the cavity shedding behaviors.

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Authors and Affiliations

  1. Nanjing University of Science and Technology, Nanjing, 210094, China

    Changli Hu, Xuede Wang & Youquan Cao

  2. Beijing Institute of Technology, Beijing, 100081, China

    Guoyu Wang

Authors
  1. Changli Hu
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  2. Xuede Wang
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  3. Guoyu Wang
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  4. Youquan Cao
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Corresponding author

Correspondence to Changli Hu.

Additional information

Recommended by Associate Editor Shin Hyung Rhee

Changli Hu obtained her Ph.D. in School of Mechanical Engineering from Beijing Institute of Technology of China in 2015. She mainly works on the experimental and numerical studies of cavitating flows, and the optimal method of the underwater body.

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Hu, C., Wang, X., Wang, G. et al. The structures of unsteady cavitation shedding flow around an axisymmetric body with a blunt headform. J Mech Sci Technol 32, 199–210 (2018). https://doi.org/10.1007/s12206-017-1221-y

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  • DOI: https://doi.org/10.1007/s12206-017-1221-y

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