Abstract

Steady flow patterns around two circular cylinders are experimentally studied at Reynolds numbers lower than unity. The cylinders are towed at a uniform speed in a tank filled with glycerin, and the dependence of the streamline patterns on the ratio of the radii of the two cylinders, their mutual spacing, and the angle between the line joining the centers and the direction of the flow are studied. When the two cylinders are in tandem arrangements, the process of changes of the first twin eddies in the gap is in accordance with the theoretical results of Miyazaki and Hasimoto. When the two cylinders are in staggered arrangement, the flow separation occurs both at small values of gaps and at large ratio of the radii of the two cylinders.

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