SST-DDES模型在大分离流动问题中的应用

摘要

The numerical method for solving Navier-Stokes equations is developed based on the SST k-w turbulence model and the delayed detached-eddy simulation(DDES).Meanwhile,the preconditioning technique coupled with implicit dual time stepping approach is implemented to simulate large separated flows with low speed and high Reynolds number.Low speed flow over a delta wing and separation flows around a 6:1 prolate spheroid are simulated.The simulated complex vortex structures agree well with physical analyzed results and experimental data.%采用基于SST k-w湍流模型耦合延迟脱体涡模拟技术(Delayed detached-eddy simulation,DDES)的SST-DDES模型,数值求解Navier-Stokes方程.并针对低速流动问题,发展了基于隐式双时间步方法的低速预处理技术,用于数值模拟低速、高雷诺数湍流大分离流动问题.数值模拟了低速大迎角三角翼绕流及大迎角6∶1椭球绕流,观察到与物理现象相一致的旋涡特征,且得到的定量数值结果与实验数据相吻合.