论文标题
非平衡湍流边界层的壁模型大涡模拟
Wall-modeled large-eddy simulation of non-equilibrium turbulent boundary layers
论文作者
论文摘要
我们进行了WMLE，以检查在弯曲的正方形管道内（Schwarz and Bradshaw 1994）内空间开发的3D TBL中，简单且广泛使用的基于ODE的平衡壁模型的性能（Schwarz and Bradshaw 1994）和3D分离的流量，后面是偏斜的凹凸（Ching et al.2018a，b; Ching and b; Ching and eaton 2019）。从平方管模拟中，对于所有考虑的网格分辨率，预测外部区域的平均速度曲线和横流角度。在弯曲区域的横流角中观察到了一些分歧，在弯曲区域中，非平衡效应最为重要。同样，对壁挂式偏斜的凹凸的仿真表明，这种简单的基于ODE的平衡壁模型以及3D分离点周围的足够的网格分辨率，从而可以合理地预测3D分离和重新触及的流动，包括平均速度分布，分离泡泡，以及凹凸唤醒中的涡流结构。
We conducted WMLES to examine the performance of a simple and widely used ODE-based equilibrium wall model in a spatially-developing 3D TBL inside a bent square duct (Schwarz and Bradshaw 1994) and 3D separated flows behind a skewed bump (Ching et al. 2018a,b; Ching and Eaton 2019). From the square duct simulation, the mean velocity profiles and crossflow angles in the outer region were predicted with high accuracy for all the considered mesh resolutions. Some disagreement was observed in the crossflow angles in the bend region where the non-equilibrium effect is most significant. Also, the simulation for the wall-mounted skewed bump showed that this simple ODE-based equilibrium wall model along with an adequate grid resolution around the 3D separation point resulted in reasonable predictions of 3D separating and reattaching flows, including mean velocity distributions, separation bubbles, and vortex structures in the bump wake.
