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基于湍流尺度的混合RANS/LES模型

李斌 吴颂平

李斌, 吴颂平. 基于湍流尺度的混合RANS/LES模型[J]. 北京航空航天大学学报, 2008, 34(7): 755-758.
引用本文: 李斌, 吴颂平. 基于湍流尺度的混合RANS/LES模型[J]. 北京航空航天大学学报, 2008, 34(7): 755-758.
Li Bin, Wu Songping. Hybrid RANS/LES model based on turbulent scale[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(7): 755-758. (in Chinese)
Citation: Li Bin, Wu Songping. Hybrid RANS/LES model based on turbulent scale[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(7): 755-758. (in Chinese)

基于湍流尺度的混合RANS/LES模型

详细信息
  • 中图分类号: V 211.3

Hybrid RANS/LES model based on turbulent scale

  • 摘要: 比较BL(Baldwin-Lomax)湍流模型的内层模型与Smagorinsky亚格子模型,两者的主要差别在于湍流尺度的计算方法不同,而RANS(Reynolds Average Numerical Simulation)方程组与LES(Large Eddy Simulation)方程组在形式上又是相同的.基于这两点,发展了RANS/LES混合模型.该模型是在网格滤波尺度与到壁面的距离相等处将流场分区,在近壁区直接求解RANS方程组,在远离壁面区域,求解LES方程组.为了保证湍流粘性系数在内外层分界处的光滑过渡,内外层湍流粘性系数通过混合函数连接.混合方法减轻了对壁面附近网格分辨率的要求和时间步长的限制,因此比LES所需的计算成本少.用该混合模型模拟了绕双椭球的高超音复杂流场,结果表明采用混合模型可以准确地模拟可压缩湍流流场.

     

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出版历程
  • 收稿日期:  2007-06-05
  • 网络出版日期:  2008-07-31

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