BLUFF BODY FLUID DYNAMICS OF D-SECTION WITH MOVING SURFACE BOUNDARY-LAYER CONTROL

摘要

Wind effects on bluff structures include higher drag force, vortex resonance and galloping type instabilities. Vibrations of tall buildings, bridges, smokestacks etc. have been of interest to scientists and engineers. Recent advances in material science and structural design have led to structures with reduced stiffness making them prone to wind, earthquake, as well as ocean waves and current excited oscillations. The present paper addresses this issue fundamentally through a comprehensive study aimed at the Moving Surface Boundary-layer Control (MSBC) of the classical D-section type bluff geometry which is suceptible to both vortex resonance and galloping type of instabilities. Extensive wind tunnel, numerical and flow visualization studies suggest that the concept of the MSBC represents a versatile tool for drag reduction and vibration control of the D-section.