二维水翼片空泡脱落及云空化数值模拟  

Numerical simulation of sheet cavity shedding and cloud cavitation on a 2D hydrofoil

作　　者：王雅赟 王本龙[1] 刘桦[1] 

机构地区：[1]上海交通大学船海建工学院水动力学教育部重点实验室,上海200240

出　　处：《水动力学研究与进展（A辑）》2014年第2期175-182,共8页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(10972138);上海市重点学科建设项目(B206)~~

摘　　要：二维空化水翼的非定常特性和云空化演化一直是空泡流领域研究的热点之一。该文采用雷诺平均NS方程(RANS)、分离涡模拟(DES)以及大涡模拟(LES)对绕二维水翼的空泡流进行了数值模拟,重点研究与评估这些数值模拟方法预报空泡流非定常特性的能力,给出了不同流动状态下的二维水翼的水动力系数。通过与二维水翼空化实验数据比较表明,修正湍流黏性系数的RANS数值模型可较准确地预报水动力系数,而DES和LES模型可准确地预报水动力系数和空泡脱落频率,是模拟云空化脱落与演化的有效途径。不同空化数条件下云空泡流场的大涡模拟结果表明,水翼片空泡尾部大尺度旋涡的生成与发展是导致片空泡断裂的主要原因,而一旦片空泡发生断裂则在片空泡下部形成显著的回射流。The unsteady hydrodynamic characteristics of a 2D cavitating hydrofoil and the evolution of cloud cavition are one of the challenging problems in the research field of cavitation. In the present work, the capability of numerical simulation with the Reynolds Averaged Navier-Stokes （RANS） equations, Detached Eddy Simulation （DES） and Large Eddy Simulation （LES） are compared on shedding and break-off of sheet cavitation and behavior of cloud cavitation for a two dimensional cavitating hydrofoil. Comparing with experimental data of a 2D hydrofoil, the RANS model with modified turbulence viscosity, DES and LES can reasonably predict the hydrodynamic forces. While DES and LES could accurately predict the hydrodynamic forces and frequency of cavity shedding, and can effectively simulate the shedding and evolution of cloud cavitation. The numerical results of 2D LES show that the generation and evolution of the vortex near the wake of sheet cavity is the primary reason of break-offof sheet cavitation, and the reentrant jet occurs only after the break of the sheet cavity.

关 键 词：云空泡 雷诺平均NS方程 分离涡模拟 大涡模拟 回射流 

分 类 号：O35[理学—流体力学]