Viscous Interference Effect Between Two Circular Cylinders in Harmonically Oscillating Flow

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  • 振動する複数円柱に働く粘性流体力の相互干渉について
  • シンドウスル フクスウ エンチュウ ニ ハタラク ネンセイ リュウタイリョク

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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.

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