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Technology Assessment & Research (TA&R) Program
 
Project Number 58
Date of Summary June 30, 1985
Subject Wave Forces on Ocean Structures
Performing Activity Oregon State University
Principal Investigator Dr. Robert T. Hudspeth
Contracting Agency Naval Civil Engineering Laboratory
Estimated Completion Completed
Description This is a Joint Industry Project (JIP) with the Naval Civil Engineering Laboratory. The purpose of this project is to isolate some of the uncertainties in the force coefficients, D and C used in the Morrison (MOJS) equation and to extend the data from an oscillating water tunnel to a harmonic free-surface wave. The logical first extension would be a large unidirectional wave in a wave flume. The test cylinder used will be capable of measuring both local pressure forces and total forces and moments on the cylinder. The data will be analyzed to determine the force coefficients for the two-term and the Sarpkaya multiple-term MOJS equation with both measured and stream function wave theory kinematics.
Progress Complete. Wave tank tests were conducted and the data was analyzed. From this tank data, it was found that maximum wave forces were more inertia dominant than would have been predicted by available theories prior to the testing. The project was extended to review some of this evidence and introduce a new direction for analysis.
Reports
AA (223 pages) Hudspeth, R. T., Nath, J. H., High Reynolds Number Wave Force Investigation in a Wave Flume, Volume I, Oregon State University, Corvallis, Oregon, February 1984.
AB (10 pages) Nath, J. H., Hsu, M. K., Hudspeth, R. T. Dummen, J., Laboratory Wave Forces on Vertical Cylinders, Proceedings Ocean Structural Dynamics Symposium 1984, Oregon State University, Corvallis, Oregon, pp. 312-330, September 11-13, 1984.
AC (78 pages) Nath, J. H., Wave Force-Phase Method for Vertical Cylinders, Oregon State University, Corvallis, Oregon, February 1985.
AD (76 pages) Nath, J. H., Wave Force-Phase Method for Vertical Cylinders, CR 85.008, Naval Civil Engineering Laboratory, Port Hueneme, California, May 1985.
AE (224 pages) Nath, J. H., and Hudspeth, R. T., High Reynolds Number Wave Force Investigation in a Wave Flume, CR 85.004, Naval Civil Engineering Laboratory, Port Hueneme, California, March 1985.