A modified PANS model for computations of unsteady turbulence cavitating flows

Chang Li Hu*, Guo Yu Wang, Guang Hao Chen, Biao Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

A modification to the PANS (partially averaged Navier-Stokes) model is proposed to simulate unsteady cavitating flows. In the model, the parameter fk 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.

Original languageEnglish
Pages (from-to)1967-1976
Number of pages10
JournalScience China: Physics, Mechanics and Astronomy
Volume57
Issue number10
DOIs
Publication statusPublished - Oct 2014

Keywords

  • PANS
  • Surrogate model
  • Turbulence model
  • Unsteady cavitating flows

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