非线性湍流模型可压缩性修正研究  

Compressibility modification nonlinear turbulence model and application in transonic flow simulation

作　　者：谭超[1] 韩省思[1] 赵鹏[1] 叶桃红[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,安徽合肥230027

出　　处：《中国科学技术大学学报》2010年第12期1293-1300,共8页JUSTC

基　　金：国家自然科学基金(50776085)资助

摘　　要：以非线性的二阶SZL和三阶CLS湍流模型为基础,对低雷诺数k-ε模型引入膨胀可压缩性和激波不稳定性修正来模化可压缩效应,发展了可压缩性修正的非线性SZL和CLS湍流模型.膨胀可压缩性修正采用广泛使用的Sarkar修正模型,激波不稳定性修正通过抑制湍流动能产生项得到.应用修正的非线性模型数值研究了经典的二维轴对称凸轴结构的跨音速流动,将预测的壁面压力、激波产生位置、近壁面流速、雷诺切应力、分离区长度等与实验结果进行对比,结果表明两种修正的非线性模型都有明显改进.预测的分离区位置、大小以及之后的再附着位置均有较大的改进,与实验符合较好.Based on the nonlinear SZL and CLS eddy viscosity turbulence models,the SZL-P and CLS-P turbulence models including the modification of compressibility and shock unsteadiness effects were developed.Sarkar’s correction was used to model dilatational compressibilithe effects.The shock unsteadiness effect was modeled by inhibiting turbulent kinetic energy production.Numerical simulations were performed in the transonic axisymmetric flow over bump.The results showed that the developed turbulence models have better performance by comparing the wall pressure distribution,shock wave location,velocity distribution near the wall,the Reynolds stress and the length of separation region with experimental data,especially for the separation flow prediction.

关 键 词：可压缩湍流 激波不稳定性 非线性湍流模型 跨音速流动 

分 类 号：O357.5[理学—流体力学]