This paper presents the impact of different geometrical parameters on the seakeeping of a trimaran in regular oblique waves. Experimental tests for eight different arrangements of outriggers were conducted for a range of wave frequencies where a constant wave heading, and wave height was maintained. It was found that the position of outriggers and the hull shape have significant impacts on dynamic performance of the model. Roll motions reduce with an increase in longitudinal spacing of main and demi-hulls transoms, separation of outrigger centre lines and buoyancy fraction of outriggers, while heave motion and resistance are increased, and pitch motions are slightly influenced. It was concluded that positioning of outriggers can reduce the roll motions peak amplitude by 80%. This is due to the trimaran geometry and the effect of reflected waves between the hulls. In configurations with minimum roll motion, the added resistance peak is maximised when compared with other configurations.

Item Type:	Refereed Article
Keywords:	high-speed trimaran, outriggers arrangement, heave motions, pitch motions; roll motions, oblique seas, seakeeping, hydrodynamics
Research Division:	Engineering
Research Group:	Maritime engineering
Research Field:	Naval architecture
Objective Division:	Transport
Objective Group:	Water transport
Objective Field:	Domestic passenger water transport (e.g. ferries)
UTAS Author:	Nowruzi, L (Dr Leo Nowruzi)
UTAS Author:	Enshaei, H (Dr Hossein Enshaei)
UTAS Author:	Lavroff, J (Dr Jason Ali-Lavroff)
UTAS Author:	Davis, MR (Professor Michael Davis)
ID Code:	137868
Year Published:	2020
Web of Science® Times Cited:	2
Deposited By:	Seafaring
Deposited On:	2020-03-09
Last Modified:	2021-09-14
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