Memory effect and wind gusts in the simulation of moored vessels
Bosmans, R. (2022). Memory effect and wind gusts in the simulation of moored vessels. MSc Thesis. Ghent University, Faculty of Engineering and Architecture: Ghent. VIII, 82 pp.
Due to the complexity of the system of a moored vessel, and the irregular forces from wind gusts and mooring equipment, moored vessels are preferably modelled in the timedomain. When doing so, it is important to include the memory effect in the model, to model the effect of irregular forces more accurately. This memory effect describes how the vessel is affected by the water surface disturbance that its own past motion caused. The Vlugmoor software of the Maritime Technology Division models the memory effect using impulse response functions, though work on this is still ongoing. The first objective of this thesis is to continue the development of the memory effect in Vlugmoor. Above all, advances were made in solving an issue causing negative damping and in considerably increasing the calculation speed. The second objective is to study the effect of wind gusts on a moored vessel. This is done by means of artificial wind gusts, meant to isolate certain characteristics from the interfering effect of others. The effect of relative wind gust direction is studied, as well that of wind gust amplitude and duration, and finally of the time over which a wind gust builds up.
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