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A modified PANS model for computations of unsteady turbulence cavitating flows

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Abstract

A modification to the PANS (partially averaged Navier-Stokes) model is proposed to simulate unsteady cavitating flows. In the model, the parameter f k is modified to vary as a function of the ratios between the water density and the mixture density in the local flows. The objective of this study is to validate the modified model and further understand the interaction between turbulence and cavitation around a Clark-Y hydrofoil. The comparisons between the numerical and experiment results show that the modified model can be improved to predict the cavity evolution, vortex shedding frequency and the lift force fluctuating in time fairly well, as it can effectively modulate the eddy viscosity in the cavitating region and various levels of physical turbulent fluctuations are resolved. In addition, from the computational results, it is proved that cavitation phenomenon physically influences the turbulent level, especially by the vortex shedding behaviors. Also, the mean u-velocity profiles demonstrate that the attached cavity thickness can alter the local turbulent shear layer.

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Authors and Affiliations

  1. Bei**g Institute of technology, Bei**g, 100081, China

    ChangLi Hu, GuoYu Wang, GuangHao Chen & Biao Huang

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  1. ChangLi Hu
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  2. GuoYu Wang
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  3. GuangHao Chen
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  4. Biao Huang
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Correspondence to ChangLi Hu.

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Hu, C., Wang, G., Chen, G. et al. A modified PANS model for computations of unsteady turbulence cavitating flows. Sci. China Phys. Mech. Astron. 57, 1967–1976 (2014). https://doi.org/10.1007/s11433-014-5538-6

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  • DOI: https://doi.org/10.1007/s11433-014-5538-6

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