Numerical investigations of rotating cylindrical micro vortex generators for turbulent boundary layer separation control

本申请旨在使用一种称为微旋转圆柱形涡发生器（mRCVG）的新装置进行流动控制的基础研究。初步研究表明，壁挂式旋转圆柱桩（其旋转轴垂直于壁面）在层流和湍流边界层流动中产生持久的顺流涡旋和高速条纹。根据已经验证的表面摩擦系数的增加，可以直接考虑mRCVGs作为湍流分离控制的新手段。目前的工作将试图确定那些产生mrcvg下游最大平均表面摩擦的参数，然后将这些参数应用于由圆形坡道上的湍流组成的测试配置。为了考虑非定常效应和深入了解流动动力学，将采用大涡模拟。在作者的期望中，mrcvg有可能成为一种简单且可能鲁棒的方法，这种方法在流体动力学中从未被研究过。

The present application is intended to perform fundamental research on flow control using a new device, called micro Rotating Cylindrical Vortex Generators (mRCVG). Preliminary work has shown that wall-mounted rotating cylinder stubs (with their rotation axis perpendicular to the wall) generate long-lasting streamwise vortices and high-velocity streaks in laminar as well as in turbulent boundary-layer flows. With an according, already verified increase of the skin friction coefficient, it is straightforward to consider mRCVGs as a possible new means for turbulent flow separation control. The present work will try to identify those parameters which yield a maximal mean skin friction downstream of the mRCVGs and then apply these to a test configuration consisting of a turbulent flow over a rounded ramp. Large-Eddy Simulation will be used in order to consider unsteady effects and obtaining insight into the flow dynamics. In the authors’ expectation mRCVGs have the potential to become a simple and presumably robust method which has never been investigated before for separation control in fluid dynamics.