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采用基于SST k-ω湍流模型耦合延迟脱体涡模拟技术(Delayed detached-eddy simulation,DDES)的SSTDDES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。
The Navier-Stokes equations are solved numerically using the SSTDDES model based on the SST k-ω turbulence model coupled with Delayed detached-eddy simulation (DDES). In order to solve the problem of low speed flow, a low speed pretreatment technique based on implicit two time step method was developed to simulate the low-speed, high Reynolds number turbulent flow with large separation. Numerical simulation of the low-angle high-angle delta wing around the flow and high angle of attack 6: 1 ellipsoidal flow, the observed vortex characteristics consistent with the physical phenomenon, and the quantitative numerical results obtained and the experimental data are consistent.