Numerical study on motion responses and mooring forces of moored floating bodies on athree-dimensional stepped seabed

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (12) : 162-175.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Numerical study on motion responses and mooring forces of moored floating bodies on athree-dimensional stepped seabed

ZHANG Longfei,LIAO Bin*,YAO Le,CHEN Shanqun

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Abstract

In this paper, by using the Smoothed Particle Hydrodynamics (SPH) method combined with the MoorDyn dynamic mooring cable numerical model, a computational model to study the motion responses and mooring forces of moored floating bodies on the three-dimensional stepped seabed under wave-driven conditions had been developed. We used the experimental data to verify and compare its applicability and accuracy. Further, the effects of the Kollagan-Carpenter number (KC number), the period T, the spacing between floating bodies d, and the seabed height h on the motion responses and mooring forces of the moored floating bodies which are located at the upstream and downstream of the stepped seabed (moored floating bodies I and II, respectively) are systematically investigated. It was found that the KC number has a motivational effect on the motion response and mooring forces of moored floating bodies I and II. As T increases, the motion response phases of moored floating bodies I and II are significantly shifted, and the amplitude of the mooring forces on the two floating bodies has a tendency to increase. The effect of d on the motion responses of moored floating bodies I and II is small, and the phases corresponding to the amplitude of the mooring forces on the two floating bodies under different d show significant shifts. As h increases, the motion response of the moored floating body I is weakened while the motion response of the moored body II is enhanced, and the amplitude of the mooring forces on the two moored floating bodies shows a similar trend. The removal of the moored floating body I resulted in intensification of the moored floating body II motion response.

Key words

Moored floating body / SPH method / MoorDyn numerical model / Motion response / Mooring force

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ZHANG Longfei, LIAO Bin, YAO Le, CHEN Shanqun. Numerical study on motion responses and mooring forces of moored floating bodies on athree-dimensional stepped seabed[J]. Journal of Vibration and Shock, 2025, 44(12): 162-175

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