Abstract
The Characteristics of the flowfield around two circular cylinders in tandem arrangement was investigated by PIV. Strouhal numbers, velocity vectors and velocity profiles were observed at centre-to-centre space ratios of P/D=1.5, 2.0 and 2.5, and Reynolds number of Re=3.0×10<SUP>3</SUP>～5.0×10<SUP>3</SUP>. As the results the Strouhal numbers measured in the rear region of the cylinder of wake side were decreased with the space ratios. The flow between two cylinders was almost stagnated and the size of the stagnated region was larger in the close side than in the far side of the front cylinder. The direction of vortex between two cylinders was opposed each other with the small difference(α=±1.0°) of the attack angle α.
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