Engineering Report on Wave Tank Tests on Split Pipe.
OREGON STATE UNIV CORVALLIS WAVE RESEARCH FACILITY
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Laboratory wave tank tests were conducted to measure and record the horizontal and vertical wave forces on a prototype split pipe with nearly full scale design wave conditions. The ranges of the Reynolds number and the Keulegan-Carpenter number covered are 10,000 to 200,000 and 0 to 40, respectively. The tests are done for three water depths, 4, 6 and 8 feet, three wave periods 2, 4 and 6 sec, four wave heights and four orientations 0, 45, 90 and -45 deg, of the bolting flanges of the split pipe. Lift, drag, inertia and maximum horizontal force coefficients were evaluated based on the Airy wave theory and the Morrison equations and other wave force equations. The wave force coefficients are dependent on the Reynolds number, Keulegan-Carpenter number and the flange angle. The single most important design parameter is determined to be the flange angle. When the flanges are parallel to the bottom, both horizontal and vertical forces are minimum, but the forces are increased by up to seven times when the flanges have large angles to the flow direction. Thus, the disorientation of the flanges by the waves may be a major contributor to split pipe failures.
- Couplers, Fasteners and Joints
- Pumps, Filters, Pipes, Tubing, Fittings and Valves
- Fluid Mechanics