Graduate Thesis Or Dissertation
 

Large displacement, high Reynolds number oscillating cylinder

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  • Hydrodynamic forces on a cylinder oscillating horizontally underwater with its axis perpendicular to the motion were measured at the Oregon State University Wave Research Facility. The cylinder had an outer diameter of 12 inches and a length of 12 feet. For the data presented herein, the maximum displacement of the motion of the cylinder ranged from 20 feet to 5 feet. The range of proximity of a nearby plane boundary, e/D, was from 0.083 to 6.0. The so called "drag", and "added mass" coefficients are calculated first by the "maximum value" method, and then by the "least square" method as described herein. The detail and development of the equations for the least-square method are also shown. For the majority of the test runs, the force coefficients obtained by the use of the least-square method are higher than those obtained by the maximum value method. The drag and added mass coefficients are found to be Reynolds number dependent. There is good agreement on the result of the drag coefficient with other investigators' results; but there is some deviation on the results of the added mass coefficients. The presence of a near-by plane boundary intensifies the wake effect and the potential flow effect and results in higher values of drag coefficients and added mass coefficients. As the amplitude of the cylinder motion decreases (from 20 feet to 5 feet), the value of the force coefficients increase.
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