We have identified certain fundamental limitations of a mixing-length parametrization used in a popular turbulent kinetic energy-based subgrid-scale model. Replacing this parametrization with a more physically realistic one significantly improves the overall quality of the large-eddy simulation (LES) of stable boundary layers. For the range of grid sizes considered here (specifically, 1 m–12.5 m), the revision dramatically reduces the grid-size sensitivity of the simulations. Most importantly, the revised scheme allows us to reliably estimate the first- and second-order statistics of a well-known LES intercomparison case, even with a coarse grid size of O(10 m).

中文翻译：

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解决稳定边界层大涡模拟中的网格尺寸敏感性问题

我们已经确定了在流行的基于湍流动能的亚网格尺度模型中使用的混合长度参数化的某些基本限制。用物理上更真实的参数化替换此参数化可显着提高稳定边界层的大涡模拟 (LES) 的整体质量。对于此处考虑的网格大小范围（特别是 1 m–12.5 m），修订版大大降低了模拟的网格大小敏感性。最重要的是，修订后的方案使我们能够可靠地估计著名的 LES 比对情况的一阶和二阶统计数据，即使粗网格大小为 O(10 m)。