HIGH REYNOLDS NUMBER OSCILLATING FLOW BY CYLINDERS

Tokuo Yamamoto, John H. Nath

Abstract


In order to determine the added mass, drag and lift coefficients of a smooth cylinder at various distances from a plane boundary, the forced cylinder oscillation tests at high Reynolds number 105 to 106 and the wave force tests at moderate Reynolds number 101* to 105 have been carried out at the Wave Research Facility at Oregon State University. It is found that the drag, lift and added mass coefficients are all strongly Reynolds number dependent. The effect of the near by plane boundary is to increase all of the force coefficients two to four times as compared to the free stream flow values. This is a most important factor to be aware of for design purposes.

Keywords


Reynolds number; oscillating flow; cylinder

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