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- W1342561 abstract "Fluid flow effects on bluff structures include higher drag resistance as well as vortex resonance and galloping type of instabilities. Vibrations of tall structures such as buildings, bridges, chimneys, offshore platforms, marine risers and a wide variety of other configurations have been of interest to engineers and scientists. Recent advances in material science and computer-aided design have led to structures with reduced stiffness, making them prone to wind and earthquake as well as ocean waves and current-excited oscillations. A structural member with square cross-section is frequently encountered in such civil, mechanical and ocean engineering applications. The present study assesses the effectiveness of the Moving Surface Boundary-layer Control (MSBC) with reference to the drag reduction and vibration suppression of a two-dimensional square prism. To begin with the effects of the momentum injection parameter UdU (Uc. cylinder surface velocity; U, free stream velocity) and angle of attack on the surface pressure distribution, resultant forces and wake characteristics are evaluated using an organized wind-tunnel static test investigation. Next, dynamic studies are undertaken to assess its effectiveness in suppressing both vortex resonance and galloping type of instabilities. Finally, the wind-tunnel test results are complemented by an extensive flow visualization study. The results suggest that the boundary-layer control through momentum injection can significantly reduce drag and effectively control flow-induced instabilities." @default.
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- W1342561 date "1996-09-01" @default.
- W1342561 modified "2023-09-26" @default.
- W1342561 title "Effect of Momentum Injection On the Drag Reduction And Flow-Induced Instabilities of a Square Prism" @default.
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