Author(s): X Wang; Q Liu; Y J Tian; P Xue

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Keywords: Unsteady cavitating flow; PANS model; NACA66 hydrofoil; Cavitation shedding dynamics

Abstract: The unsteady cavitating flows around a NACA66 hydrofoil with chord length 150 mm and the attack angle of 6 degrees was numerically simulated using two different turbulence models: the standard k-ε turbulence model and the PANS model. The results show that the standard k-ε turbulence model over predicts the eddy viscosity in the rear part of the cavity and fails to predict the unsteady shedding dynamics. However, it is found that the PANS model can accurately capture the general features of unsteady cavitating flow and the predicted shedding frequency agrees fairly well with the corresponding experimental data. Based on the predicted numerical results, the vorticity transport equation was implied to further analyze the strong interaction between the cavitation and vortex. The foundings in this study can provide further insight into the mechanism of cavitation shedding dynamics.

DOI: https://doi.org/10.1088/1755-1315/163/1/012076

Year: 2017