Publication Detail

The Slow-drift Response of Multi-leg Structures in Regular and Random Waves

Paul Sclavounos, Ole J. Emmerhoff
15 pp.
MITSG 93-10J

A theory is developed for the prediction of the slow-drift response of multi-leg structures in waves. A multiple scales approximation is used to decouple the linear high-frequency body motions from the quadratic slow-drift responses. The former are treated in the frequency domain while the latter are shown to be governed by an ordinary differential equation which is solved in the time domain. Explicit hydrodynamic solutions are obtained for arrays of vertical cylinders, permitting the efficient evaluation of the drift force and damping forces over long time intervals in random waves. The relative importance of the viscous and ideal wave damping mechanisms is investigated, the sensitivity of the slow-drift response on the wave direction is studied and the disparity of time scales in the slow-drift problem is demonstrated.

type: Technical reports

Parent Project

Project No.: 1991-RO-37
Title: Slow-Drift Oscillations of Marine Structures

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