论文标题
基于尺度能量转移的湍流通道流的大型涡流模拟
Large eddy simulations of turbulent channel flow based on interscale energy transfer
论文作者
论文摘要
扩展了一个先前开发的用于大型涡流模拟的建模程序（较少），以允许实施不均匀流的物理空间。该方法的启发是受到均质，各向同性湍流的良好理论分析和数值研究的启发。制定了一种侧重于从解析场中恢复完整的子网格量表（SGS）耗散的一般程序，结合了建模的结构和功能策略的优势。尺度能量转移是从测试过滤速度场，相应的子滤光器尺度（SFS）应力获得的，或者等效地，相似性模型用于计算总SGS耗散。然后以涡流粘度的形式施放能量传递，从而使其保留所需的总SGS耗散，并使该方法在数值上作为反向散射控制的自动步骤。该方法能够在实际的低分辨率运行中提供适当的总能量耗散。新方法是一般和独立的，可以很好地适用于不同的过滤内核，雷诺数字和网格分辨率。
A previously developed modeling procedure for large eddy simulations (LESs) is extended to allow physical space implementations for inhomogeneous flows. The method is inspired by the well-established theoretical analyses and numerical investigations of homogeneous, isotropic turbulence. A general procedure that focuses on recovering the full subgrid scale (SGS) dissipation from resolved fields is formulated, combining the advantages of both the structural and the functional strategy of modeling. The interscale energy transfer is obtained from the test-filtered velocity field, corresponding subfilter scale (SFS) stress or, equivalently, the similarity model is used to compute the total SGS dissipation. The energy transfer is then cast in the form of eddy viscosity, allowing it to retain the desired total SGS dissipation and making the method numerically robust as an automatic step of backscatter control. The method is capable of providing a proper amount of total energy dissipation in actual, low resolution LES runs. The new approach is general and self-contained, working well for different filtering kernels, Reynolds numbers, and grid resolutions.
