论文标题
无租用壁模型LE的要求和灵敏度分析
Requirements and sensitivity analysis of RANS-free wall-modeled LES
论文作者
论文摘要
我们研究壁模型输入变量对外LE的建模选择的敏感性。这项工作是由在动态滑动壁模型中观察到的灵敏度的动机。这些动态壁模型使用近壁LES溶液中的变量作为输入，以预测壁应力，而无需依赖先验系数或平衡假设。减轻壁模型输入中的灵敏度允许开发可靠的动态壁模型。 SGS模型，边界条件类型，数字和网格拓扑的影响通过一系列的WMLES计算来评估。概率密度函数是从WMELS溶液平面以壁正常采样高度计算的，并用作灵敏度的度量。当SGS模型携带的总壁应力的比例恒定时，可以缓解对SGS模型的敏感性。使用六边形的封闭式网格缓解了数值敏感性。
We study the sensitivity of wall model input variables to the modeling choices of the outer LES. This work is motivated by sensitivities observed in dynamic slip wall models. These dynamic wall models use variables from the near-wall LES solution as inputs to predict the wall stress without relying on a priori coefficients or equilibrium assumption. Mitigating the sensitivities in the wall model inputs allows development of robust dynamic wall models. The effects of SGS model, boundary condition type, numerics, and mesh topology are assessed through a series of WMLES calculations of turbulent channels. Probability density functions are computed from planes of the WMLES solutions at a wall-normal sampling height and are used as a metric for sensitivity. Sensitivity to SGS model is alleviated when the fraction of total wall stress carried by the SGS model is held constant. Use of hexagonal close-packed grids mitigated numerical sensitivities.
