二阶动态亚格子尺度应力模型

A Second-Order Dynamic Subgrid-Scale Stress Model

提出了一个基于亚格子尺度应力与速度梯度张量之间关系的二阶动态模型· 然后利用在高雷诺数的流场直接数值解的结果对此二阶模型进行检验· 直接数值解的流场包括均匀各向同性强迫湍流,衰减湍流以及均匀旋转湍流· 数值检验结果发现与一阶动态模型相比,二阶模型的相关系数提高·

A second_order dynamic model based on the general relation between the subgrid_scale stress and the velocity gradient tensors was proposed. A priori test of the second_order model was made using moderate resolution direct numerical simulation date at high Reynolds number (Taylor microscale Reynolds number R λ=102～216) for homogeneous, isotropic forced flow, decaying flow, and homogeneous rotating flow. Numerical testing shows that the second_order dynamic model significantly improves the correlation coefficient when compared to the first_oder dynamic models.