A DYNAMIC SUBGRID-SCALE EDDY VISCOSITY MODEL
A DYNAMIC SUBGRID-SCALE EDDY VISCOSITY MODEL
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DOI：
10.1063/1.857955
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发表时间：
1991-07-01
期刊：
影响因子：
--
通讯作者：
CABOT, WH
中科院分区：
文献类型：
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作者：
GERMANO, M;PIOMELLI, U;CABOT, WH
在大涡模拟中使用的涡粘性亚网格尺度应力模型的一个主要缺点是它们不能正确地表示与一个单一的通用常数不同的湍流场在旋转或剪切流，固体壁附近，或在过渡制度。在本工作中，一个新的涡粘性模型，其中包括许多这些缺点。随着计算的进行而动态地计算模型系数，而不是先验地输入。该模型是基于在两个不同的过滤水平和解决湍流应力的亚网格尺度应力之间的代数恒等式。使用该模型得到的亚网格尺度应力在层流和固体边界处消失，并在湍流边界层的近壁区域具有正确的渐近行为。采用该模型对槽道转捩和湍流进行了大涡模拟，模拟结果与直接模拟结果吻合较好。
One major drawback of the eddy viscosity subgrid-scale stress model used in large-eddy simulations is their inability to represent correctly with a single universal constant different turbulent fields in rotating or sheared flows, near solid walls, or in transitional regimes. In the present work a new eddy viscosity model is presented which alleviates many of these drawbacks. The model coefficient is computed dynamically as the calculation progresses rather than input a priori. The model is based on an algebraic identity between the subgrid-scale stresses at two different filtered levels and the resolved turbulent stresses. The subgrid-scale stresses obtained using the proposed model vanish in laminar flow and at a solid boundary, and have the correct asymptotic behavior in the near-wall region of a turbulent boundary layer. The results of large-eddy simulations of transitional and turbulent channel flow that use the proposed model are in good agreement with the direct simulation data.