RANS simulation of unsteady cavitation flows around a twisted hydrofoil

摘要：

　　Simulations of unsteady cavitation flows around a twisted hydrofoil are carried out by using Reynolds-averaged Navier-Stokes (RANS).Two different turbulence models are investigated in this work, one is the standard k-ε k model based on Boussinesq turbulent-viscosity hypothesis, the other one is the nonlinear k-ε turbulence model.By comparing the cavity structures between numerical and experimental results, it was found that the numerical results with the nonlinear turbulence model is in good agreement with the experimental results.The vortex structure can be captured by both the linear and nonlinear turbulence model in the separation region, but with different vorticity magnitude.By analyzing the vortices structure with Q-criterion, the nonlinear turbulence model can predict the stronger vortex, which result in a low pressure distribution and a U-shape cavitation vortex.Numerical results indicate that the nonlinear turbulence model provide a better choice for numerical simulations of cavitation flows with strong vortical structures.

关键词： three-dimensional twisted hydrofoil unsteady cavitation flows nonlinear turbulence models U-shape and Hairpin-shape vortices OpenFOAM

作者: Zhihui Liu Benlong Wang Xiaoxing Peng

作者单位: Department of Engineering Mechanics, Shanghai Jiaotong University, Shanghai 200240, China China Ship Scientific Resaerch Center, Wuxi 214082, China

会议类型: 国际会议

会议名称: The Second Conference of Global Chinese Scholars on Hydrodynamics(第二届全球华人水动学学术会议)

会议地点: 江苏 无锡

会议语种:英文

页码: 766-771

在线出版日期: 2016-11-11（万方平台首次上网日期，不代表论文的发表时间）