论文标题
在稳定边界层的大涡模拟中解决网格大小的灵敏度问题
Addressing the Grid-size Sensitivity Issue in Large-eddy Simulations of Stable Boundary Layers
论文作者
论文摘要
在这项研究中，我们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局限性。用更现实的参数替换此参数化可以显着提高稳定边界层的大涡模拟（较少）的总体质量。对于此处考虑的网格大小的范围（特别是1 m-12.5 m），修订会大大降低模拟的网格大小灵敏度。最重要的是，修订后的方案使我们能够可靠地估计众所周知的LES对比案例的一阶统计，即使具有O（10 m）的粗网格大小也是如此。
In this study, we have identified certain fundamental limitations of a mixing length parameterization used in a popular turbulent kinetic energy-based subgrid-scale model. Replacing this parameterization with a more physically realistic one significantly improves the overall quality of the large-eddy simulations (LESs) 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).
