大气边界层大涡模拟中反应标量通量的亚网格尺度模拟
Subgrid-scale modeling of reacting scalar fluxes in large-eddy simulations of atmospheric boundary layers
摘要：
在大气边界层湍流的大涡模拟中，对于惰性标量，涡扩散亚网格尺度（SGS）模式中的集总系数依赖于尺度。这种尺度依赖性在表面附近占主导地位。本文应用一个尺度相关的动力学SGS模型对中性边界层进行了大涡模拟。由于模型系数是根据解析尺度的动态特性动态计算的，因此模拟无需进行任何参数调整。一组化学的情况下，代表各种湍流反应流制度进行检查。反应物参与一级反应，并以恒定和均匀的表面通量注入大气边界层。重点放在研究分辨率和化学制度的SGS模型的性能的综合影响。与尺度相关的动态模型的模拟产生的预期趋势的系数作为分辨率的函数，在流动和化学制度的位置，导致分辨率无关的湍流反应物通量。
英文摘要：
In large-eddy simulations of atmospheric boundary layer turbulence, the lumped coefficient in the eddy-diffusion subgrid-scale (SGS) model is known to depend on scale for the case of inert scalars. This scale dependence is predominant near the surface. In this paper, a scale-dependent dynamic SGS model for the turbulent transport of reacting scalars is implemented in large-eddy simulations of a neutral boundary layer. Since the model coefficient is computed dynamically from the dynamics of the resolved scales, the simulations are free from any parameter tuning. A set of chemical cases representative of various turbulent reacting flow regimes is examined. The reactants are involved in a first-order reaction and are injected in the atmospheric boundary layer with a constant and uniform surface flux. Emphasis is placed on studying the combined effects of resolution and chemical regime on the performance of the SGS model. Simulations with the scale-dependent dynamic model yield the expected trends of the coefficients as function of resolution, position in the flow and chemical regime, leading to resolution-independent turbulent reactant fluxes.
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