Aerodynamic control of tall building due to the streamwise vortices.

为了控制钝壁圆柱的脱落涡和分离流，需要研究周期性涡运动的详细规律。这种现象造成较大的空气动力。需要各种有效的方法来减小输入的非定常力。第一种方法是根据钝壁圆柱截面形状的变化进行气动控制。二是涡旋发生器对方形圆柱分离出的剪切层进行控制。在这里，我们提出了附着在方形圆柱体倒角表面上的涡发生器，在那里，人们认识到在前角产生的强流向涡与从圆柱体脱落的侧向涡相互作用。我也关注它们的物理机制。通过对实验数据和计算数据的比较，讨论了控制由流向涡引起的分离剪切层的有效性。

For the control of vortex-shedding and separated flows from bluff cylinders, the detailed patterns of the periodic vortex motions should be investigated. This phenomenon causes the large aerodynamic forces. Various efficient methods are required to reduce the input unsteady forces. First method is the aerodynamic control due to variations of the section shapes of a bluff cylinder. Second one is the control of the separated shear layrs from a square cylinder by the vortex generator. Here we have proposed the vortex generator attached to the chamfered surface of a square cylinder, where it is recognized that the strong streamwise vortices generated at the frontal corner interact with the lateral vortices shed from the cylinder. I also bring into focus their physical mechanism. The effectiveness of the control of the separated shear layrs due to the streamwise vortices is discussed, through the comparison between the experimental and computational data.