A generalized form of a recently developed minimum dissipation model for subfilter turbulent fluxes is proposed and implemented in the simulation of thermally stratified atmospheric boundary-layer flows. Compared with the original model, the generalized model includes the contribution of buoyant forces, in addition to shear, to the production or suppression of turbulence, with a number of desirable practical and theoretical properties. Specifically, the model has a low computational complexity, appropriately switches off in laminar and transitional flows, does not require any ad hoc shear and stability corrections, and is consistent with theoretical subfilter turbulent fluxes. The simulation results show remarkable agreement with well-established empirical correlations, theoretical predictions, and field observations in the atmosphere. In addition, the results show very little sensitivity to the grid resolution, demonstrating the robustness of the model in the simulation of the atmospheric boundary layer, even with relatively coarse resolutions.

中文翻译：

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使用最小耗散模型对热分层大气边界层流进行大涡模拟

提出并在热分层大气边界层流的模拟中实施了最近开发的子过滤器湍流通量最小耗散模型的一般形式。与原始模型相比，广义模型除剪切外还包括浮力对湍流的产生或抑制的贡献，具有许多理想的实际和理论特性。具体而言，该模型计算复杂度低，在层流和过渡流中适当关闭，不需要任何特别的剪切和稳定性校正，并且与理论子过滤器湍流通量一致。模拟结果显示出与公认的经验相关性、理论预测和大气中的现场观测非常一致。此外，