超声速复杂流动中湍流模型的性能评估

Evaluation of engineering turbulence models for complex supersonic flows

对8°,16°,20°,24°超声速二维压缩拐角进行了数值模拟,系统评估了SA(Spalart-Allmaras),k-ω,SST(Shear Stress Transport)3种工程常用湍流模型对激波/边界层干扰复杂流动的模拟适用能力.对于"弱"干扰、小分离,工程常用湍流模型能够较准确地预测其压力、摩擦力、热流分布,而对于"强"干扰、大分离则会造成较大的偏差.同时,随着分离区的增大,各湍流模型的适用性能差别更加明显,数值方法也有一定的影响.

Supersonic flows past a series of two-dimensional compression ramps were simulated by employing three popular engineering turbulence models,namely Spalart-Allmaras（SA）,k-ω,shear stress transport（SST）.The performance of the three engineering turbulence models was evaluated and summarized.All three turbulence models are reasonably accurate to predict the surface pressure,skin friction and heat transfer distribution for ＂weak＂ shock/boundary-layer interactions,but show significant discrepancies with experimental data for ＂strong＂ interactions.Each turbulence model shows much different simulation capability with the separation lengths increased,and the numerical method has much effect too.