Subgrid Model with Scaling Laws for Atmospheric Simulations
Subgrid Model with Scaling Laws for Atmospheric Simulations
复制标题
具有大气模拟缩放定律的子网格模型
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Zidikheri
中科院分区：
文献类型：
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作者：
V. Kitsios;J. Frederiksen;M. Zidikheri
摘要 具有自相似标度律的亚网格尺度参数化是为大气流动的大涡模拟（LES）而开发的。关键的新贡献是尺度定律的发展，该定律控制这些参数化如何依赖于 LES 分辨率和流动强度。考虑了亚网格尺度涡流对保留尺度的影响的随机和确定性表示。随机子网格模型由反向散射噪声项和排出涡流粘度组成，而在确定性子网格模型中，这两项的净效应由净涡流粘度表示。在这两种情况下，子网格传输都是根据更高分辨率参考直接数值模拟（DNS）的统计数据自洽计算的。对于分辨率高达三角 504 波数截断的 DNS，确定子网格参数化对 LES 分辨率的依赖性。子网格参数化是针对典型的大型大气...
AbstractSubgrid-scale parameterizations with self-similar scaling laws are developed for large-eddy simulations (LESs) of atmospheric flows. The key new contribution is the development of scaling laws that govern how these parameterizations depend on the LES resolution and flow strength. Both stochastic and deterministic representations of the effects of subgrid-scale eddies on the retained scales are considered. The stochastic subgrid model consists of a backscatter noise term and a drain eddy viscosity, while in the deterministic subgrid model the net effect of these two terms is represented by a net eddy viscosity. In both cases the subgrid transfers are calculated self-consistently from the statistics of higher-resolution-reference direct numerical simulations (DNSs). The dependence of the subgrid parameterizations on the resolution of the LESs is determined for DNSs having resolutions up to triangular 504 wavenumber truncations. The subgrid parameterizations are developed for typical large-scale atmo...