Effect of freestream turbulence on wall turbulent flows over multi-scale rough walls

在本研究中，我们试图研究单尺度和多尺度粗糙壁面上的壁面湍流流动特性，模拟自由流湍流对壁面湍流的影响，并通过数值模拟的方法解决对衰减型均匀各向同性湍流的基本特征的理解，这种湍流应设置为自由流湍流，由于其高度的能量守恒特性，其精度预计会更高。

In this study, we attempt to examine characteristics of wall turbulent flows over one-scale and multi-scale rough walls, to simulate effect of free-stream turbulence on these wall turbulences, and to address the understanding of fundamental characteristics of decaying homogeneous-isotropic turbulence, which should be set as free-stream turbulence, by means of numerical simulation, of which accuracy is expected to be higher because of its highly energy-conservation characteristics.