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Transient growth of coherent streaks for control of turbulent flow separation

机译：相干条纹的瞬态生长以控制湍流分离

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摘要

In this paper, we summarise our recent results on turbulent flow separation control using transient growth of large-scale coherent streaks. According to linear stability analysis, the optimal perturbations (i.e., disturbances experiencing the largest transient energy growth) sustained by a turbulent boundary layer are large-scale streamwise uniform coherent vortices leading to streaks, the lift-up effect being responsible for their growth. A first experimental study confirms that using arrays of suitably shaped cylindrical roughness elements, streaks can be artificially forced in a flat plate turbulent boundary layer at a Reynolds number based on the displacement thickness of 1,000. Interacting with the mean flow at leading order, these streaks induce a strong controlled spanwise modification and that their amplitude transiently grows in space. Eventually, streaks are forced on the roof of a generic car model (Ahmed body, see Ahmed et al., 1984) to test their ability to suppress the separation around the rear-end.
机译：在本文中，我们总结了使用大规模相干条纹的瞬时增长进行湍流分离控制的最新结果。根据线性稳定性分析，由湍流边界层承受的最佳扰动（即经历最大瞬态能量增长的扰动）是导致条痕的大规模沿流均匀相干涡，抬升效应是其增长的原因。一项初步的实验研究证实，使用适当形状的圆柱粗糙度元件阵列，可以基于位移厚度为1,000的雷诺数将条纹人为地压入平板湍流边界层中。这些条纹与前导的平均流相互作用，引起强烈的受控展向方向修改，并且它们的幅度在空间中瞬时增长。最终，条纹被迫压在通用汽车模型的车顶上（Ahmed车身，请参见Ahmed等，1984），以测试其抑制后端分离的能力。

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