Numerical analysis of cavitation shedding flow around a three-dimensional hydrofoil using an improved filter-based model

作者：Zhang, De-sheng^*; Shi, Wei-dong; Zhang, Guang-jian; Chen, Jian; van Esch, B. P. M.

来源：Journal of Hydrodynamics, 2017, 29(2): 361-375.

DOI：10.1016/S1001-6058(16)60746-1

• Cloud cavitation
• shedding flow
• filter-based model
• turbulent viscosity
• Clark-Y hydrofoil

The cavitation shedding flow around a 3-D Clark-Y hydrofoil is simulated by using an improved filter-based model (FBM) and a mass transfer cavitation model with the consideration of the maximum density ratio effect between the liquid and the vapor. The unsteady cloud cavity shedding features around the Clark-Y hydrofoil are accurately captured based on an improved FBM model and a suitable maximum density ratio. Numerical results show that the predicted cavitation patterns and evolutions compare well with the experimental visualizations, and the prediction errors of the time-averaged lift coefficient, drag coefficient and Strouhal number St for the cavitation number sigma = 0.8, the angle of attack alpha = 8(omicron) at a Reynolds number Re = 7 x10(5) are only 3.29%, 2.36% and 9.58%, respectively. It is observed that the cavitation shedding flow patterns are closely associated with the vortex structures identified by the Q - criterion method. The predicted cloud cavitation shedding flow shows clearly three typical stages: (1) Initiation of the attached sheet cavity, the growth toward the trailing edge. (2) The formation and development of the re-entrant jet flow. (3) Large scale cloud cavity sheds downstream. Numerical results also indicate that the non-uniform adverse pressure gradient is the main driving force of the re-entrant jet, which results in the U-shaped cavity and the 3-D bubbly structure during the cloud cavity shedding.

• 出版日期2017-4
• 单位江苏大学