Abstract
The flow around a pair of semi-infinite circular cylinders arranged side-by-side at various spacings on a flat plate has been investigated experimentally. The two cylinders were aligned with the axis normal to both the flat plate and the free stream. Pressure distributions on the cylinders and velocity distributions in the wake were measured. The flow patterns on the cylinders and on the plate were visualized using an oil-film-technique, and the flow visualization around the cylinders was done by the smoke-wire method. As the distance between the two cylinders increased in order, the flow changed from the biased flow pattern deviated from one cylinder to the straight advancing flow pattern, showing a violent variation at the boundary region between two patterns. For large spacing of cylinders on the flat plate, the change of the flow pattern occurred more quickly, resulting in the reduction of the distance between the two cylinders.
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