Viscous Interference Effect Between Two Circular Cylinders in Harmonically Oscillating Flow

Abstract

Interference effect between two oscillating circular cylinders in still water is experimentally investigated. The array of two circular cylinders with the same diameter is placed at the angle of 0゜,30゜,45°and 90゜ to the direction of motion. The spacing between the cylinder centers was varied from 1.2 diameters to 7 diameters. Drag and added mass coefficients, which are analyzed the experimental data by Fourier Analysis, are presented as the functions of the K_c number and the spacing of two circular cylinders. Lift coefficient and its frequency in occurrence are also obtained to show that the lift force decreases a little with decreasing the spacing and that the lift frequency is independent of the spacing.