スプリッタプレート付円柱後流の安定性(流体工学,流体機械)

概要

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The global instability of flows behind a circular cylinder with a splitter plate is investigated theoretically to understand stabilizing effects of splitter plate on the cylinder wake. The stability analyses show that the critical Reynolds number for the global instability, which is about 46 without splitter plate, increases with the splitter-plate length. The Strouhal number of the most amplified disturbance at the critical Reynolds number is found to be not strongly dependent on the splitter plate length. It is also found that the flow becomes globally unstable when the streamwise length of the recirculating region measured from the trailing edge of splitter plate exceeds about 2.5 times the cylinder diameter. These conditions for the onset of the global instability are the same as in the absence of splitter plate.
2008-09-25