AM05-03-010 断面辺長比4の矩形まわりの流れのフィードバック制御(風工学4,一般講演)

概要

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A feedback control technique of vortex shedding behind a rectangular cylinder is investigated through numerical simulations. Periodic velocity excitation is applied from the cylinder surface to the separated shear flows with a time delay and feedback gain for the fluid velocity at a downstream sensor location. It is shown that the feedback excitation can suppress the vortex shedding with appropriate time delay and feedback gain. However, the vortex shedding can not be suppressed absolutely even if the feedback gain is raised, and higher feedback gain amplifies the vortex shedding. This is because the strong excitation caused by the high feedback gain induces strong vortices from the leading edge of the cylinder due to feedback amplification mechanism.
日本流体力学会の論文
2005-09-05