Nonlinear subgrid-scale (SGS) models using the resolved rate-of-strain and non-persistence-of-straining tensors are assessed employing an a priori test for turbulent channel flows using Direct Numerical Simulation (DNS) results. The modeled and DNS subgrid stress tensors are compared. The results have shown that including the non-persistence-of-straining tensor in the tensorial basis of the SGS model leads to a better representation of the anisotropy of these scales. The near-wall region modeling can be significantly improved when compared to linear models that do not consider the non-persistence-of-straining tensor.

中文翻译：

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使用非持久性张量的非线性子网格规模模型

使用先验检验，使用直接数值模拟（DNS）结果，对湍流通道流进行先验检验，从而评估使用已解决的应变率张量和非应变持久性张量的非线性亚网格规模（SGS）模型。比较了模型和DNS亚网格应力张量。结果表明，将非持久性张量包括在SGS模型的张量基础中可以更好地表示这些标度的各向异性。与不考虑非持久性张量的线性模型相比，可以显着改善近壁区域建模。