三种湍流模型模拟能力的对比

采用中心有限体积，Runge-Kutta方法显式求解三维Reynolds平均Navier-Stokes方程，使用三种湍流模型数值模拟跨声速及超声速流动。着重介绍半方程J－K模型的两个改进版本：J－K90A模型和J－K92模型，该模型对分离流动有较好的模型能力。J－K模型92年版本具有更好的模拟大攻角，大分离流动的能力，它能较准确地模拟背风面涡的结构与强度，同时能更好地模拟壁面压力分布，当流动存在较强激波时，平衡态的Baldwin-Lomax模型模拟的激波位置明显地靠后。对于附体或中等分离的流动，三种湍流模型都能得到与实验结果吻合良好的结果。

Comparison of Predictive Capabilities of Three Turbulent Models

A numerical simulation is presented for the steady state flow for transonic and supersonic flows. We integrated numerically the 3 D Reynolds averaged Navier Stokes equations, using central finite volume method and explicit Runge Kutta algorithm on the basis of one of three turbulent models: B L(Baldwin Lomax) model, J K90A model or J K92 model. We did the integration for all three models. J K92 model matched the experimental results much better than the other two models when simulating high angle of attack large separated flows. J K92 model also improved the prediction of: (1) the vortex shape and strength, (2)the surface pressure distribution. The equilibrium model of Baldwin Lomax predicted the shock location too far aft for separated flows. In general, all three models performed well for attached or mildly separated flows.