Unsteady Flow past a Flat Plate Normal to the Direction of Motion

概要

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The development of the separated flow past a flat plate which was started from rest either impulsively or with uniform acceleration was investigated experimentally by using flow-visualization techniques. The flow is irrotational initially. The onset of separation takes place at the two edges of the plate. The symmetrical twin-vortices are always formed at small times no matter how large the Reynolds number may be. The length of the wake bubble is nearly proportional to (Ut/d)^<2/3> or (at^2/d)^<2/3> at small values of (νt/d^2)(where U is the plate speed, t the time from the start, d the plate length, a the acceleration and ν the kinematic viscosity). The length of the symmetrical wake bubble exceeds 4.1 plate lengths at ad^3/ν^2=4.2×10^2.
社団法人日本物理学会の論文
1971-01-05