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首页> 外文期刊>International journal of computational fluid dynamics >A dynamic eddy-viscosity closure model for large eddy simulations of two-dimensional decaying turbulence
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A dynamic eddy-viscosity closure model for large eddy simulations of two-dimensional decaying turbulence

机译：二维衰减湍流大涡模拟的动态涡粘性闭合模型

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This paper puts forth a simplified dynamic eddy-viscosity subgrid-scale model for the vorticity transport equation which is employed in a large eddy simulation study of freely evolving isotropic two-dimensional turbulent flows. The dynamic parameter is averaged in space, thereby retrieving a spatially constant value which only varies in time. The proposed dynamic model is applied to a two-dimensional decaying turbulence problem in a square periodic box, which is a standard prototype of more realistic turbulent flows in the atmosphere and oceans, in order to eliminate any possible errors associated with the boundary conditions or mesh non-uniformities. Compared with high-resolution direct numerical simulations, the performance of the dynamic model is systematically investigated considering various filtering strategies by means of test filters. The effects of the computational resolution and the filtering ratio between the test and the grid filters are also studied by using a huge set of parameters.
机译：提出了一种简化的涡旋输运方程式动态涡流粘性亚网格尺度模型，该模型用于自由演化各向同性二维湍流的大涡流模拟研究中。动态参数在空间中取平均值，从而获取仅随时间变化的空间常数值。所提出的动力学模型被应用于正方形周期盒中的二维衰减湍流问题，这是大气和海洋中更逼真的湍流的标准原型，以便消除与边界条件或网格相关的任何可能的误差。非均匀性。与高分辨率直接数值模拟相比，通过测试滤波器考虑各种滤波策略，系统地研究了动态模型的性能。还使用大量参数来研究计算分辨率和测试与网格滤波器之间的滤波比率的影响。

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