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In-line force on a cylinder translating in oscillatory flow |
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| Authors: | T Sarpkaya M Storm |
| Institution: | Naval Postgraduate School, Monterey, CA 93943, USA Philadelphia Naval Ship Yard, Philadelphia, PA 19112, USA |
| Abstract: | Experiments were conducted with smooth and sand-roughened cylinders moving with constant velocity in a sinusoidally oscillating flow to determine the drag and inertia coefficients and to examine the effect of wake biasing on the modified Morison equation. The various flow parameters such as the relative cylinder velocity. Reynolds number, and the Keulegan-Carpenter number were varied systematically and the in-line force measured simultaneously. The principal results, equally valid for both smooth and rough cylinders, are as follows: the drag coefficient decreases with increasing relative current for a given Reynolds number and Keulegan-Carpenter number; the effect of wake biasing on the drag and inertia coefficients is most pronounced in the drag-inertia dominated regime; and the two-term Morison equation with force coefficients obtained under no-current conditions is not applicable to the prediction of wave and current induced loads on circular cylinders. |
| Keywords: | flow cylinder force current oscillation offshore |
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