Flows around Two Tandem Circular Cylinders at Very High Reynolds Numbers

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概要

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• Flows around two tandem circular cylinders in a stream up to the range of much higher Reynolds numbers than the critical one were investigated in a low speed wind tunnel. By making the surface of the upstream circular cylinder rough with two types of surface roughness, the critical Reynolds number of the cylinders was reduced. Drag coefficients and Strouhal numbers of the two tandem circular cylinders were measured and the flow patterns on the cylinders were visualized by the surface oil-flow technique, in the subcritical flow regime, in the supercritical one where there were laminar bubbles followed by turbulent separation and in the transcritical one where purely turbulent separation occurred without laminar bubbles but with an extremely regular vortex shedding behind the cylinders. The flow characteristics of the two tandem circular cylinders were discussed and the effects of Reynolds numbers and the gap spacing between the two cylinders were made clear.

• 一般社団法人日本機械学会の論文

著者

• Okajima Atsushi

  Research Institute For Applied Mechanics Kyushu University

関連論文

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• Viscous Flow Around a Rotationally Oscillating Circular Cylinder
• Flow and Temperature Fields around a Heated Circular Cylinder in a Fluctuating Flow of Low Reynolds Number : A Numerical Study on Thermo-Fluiddynamic Response of the Hot-Wire
• Flows around Two Tandem Circular Cylinders at Very High Reynolds Numbers

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