Aerodynamic control of tall building due to the streamwise vortices.

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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.