Visualization of the Unsteady Flow past Cylinders and Plates Decelerated from Steady Speed

概要

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Time-dependent flows around circular cylinders and flat plates, which are decelerated from a steady speed, were investigated by means of a flow visualization technique at low Reynolds numbers. For very small values of deceleration, the twin-vortices behind the test body shorten monotonically during deceleration, but elongate rapidly just before the test body is stopped. For intermediate values of deceleration, the twin-vortices elongate slightly at the first, but after a while they begin to shorten, the elongate again just before the test body is completely sopped. For large values of deceleration, the twin-vortices elongate monotonically. When the test body is decelerated rapidly from one steady speed to another lower speed, a large vortex-pair is formed in the wake during deceleration. After the second speed is reached the vortex-pair leaves the test body and moves backward, and the whole field of flow proceeds to grow into a new steady state.
社団法人日本物理学会の論文
1971-10-05