Numerical investigation of unsteady cavitating flow around a hydrofoil using the PANS method

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Wang, X.^1 ; Liu, Q.^2 ; Tian, Y.J.^1 ; Xue, P.^1

China Institute of Water Resources and Hydropower Research, Beijing

100038, China^1

China Ship Development and Design Center, Wuhan

430072, China^2

关键词: Chord lengths;    Eddy viscosity;    Numerical investigations;    Numerical results;    Shedding frequencies;    Strong interaction;    Unsteady cavitating flows;    Vorticity transport equations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012076/pdf
DOI  :  10.1088/1755-1315/163/1/012076

来源: IOP

【 摘 要 】

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- turbulence model and the PANS model. The results show that the standard k- 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.