Anisotropic grid-adaptation in large eddy simulations
Anisotropic grid-adaptation in large eddy simulations
复制标题
大涡模拟中的各向异性网格自适应
DOI：
10.1016/j.compfluid.2017.07.006
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发表时间：
2017
影响因子：
2.8
通讯作者：
J. Larsson
中科院分区：
文献类型：
--
作者：
S. Toosi;J. Larsson
网格自适应需要一个错误指示器，用于标识网格应该在何处以及如何进行优化。在连续性解析模拟（LES，DNS等）的情况下，一个简单而直观的误差指标是小尺度能量，它可以与建模误差和数值误差相关联。本工作的目的是为大涡模拟引入一个新的误差指标，该指标以定向方式基于小尺度能量，即，以实现各向异性网格自适应的方式。该公式是几何一般和适用于任意几何形状和网格拓扑结构。首先对湍流通道流的误差指标进行评估，以测试其预测网格最佳各向异性的能力，然后对后向台阶上的流动进行评估，以测试其在非结构化网格的更复杂情况下的性能。
Grid-adaptation requires an error indicator that identifies where and how the grid should be refined. In the case of turbulence-resolving simulations (LES, DNS, etc), a simple and intuitive error indicator is the small-scale energy which can be linked to both the modeling errors and the numerical errors. The purpose of this work is to introduce a new error indicator for large eddy simulations that is based on the small-scale energy in a directional manner, i.e., in a way that enables anisotropic grid-adaptation. The formulation is geometrically general and applicable to arbitrary geometries and grid topologies. The error indicator is first assessed on turbulent channel flow to test its ability to predict the optimal anisotropy of the grid, and then assessed on the flow over a backward-facing step to test its performance in a more complex case with an unstructured grid.