Experimental study on hydrodynamic performance of SWATH vessels in calm water and in head waves |
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| Institution: | 1. State Key Laboratory of Structural Analysis for Industrial Equipment, China;2. School of Naval Architecture, Dalian University of Technology, Dalian, China;1. Key Laboratory of High Performance Ship Technology of Ministry of Education, School of Transportation, Wuhan University of Technology, Wuhan 430063, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;3. Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Lisboa 1049-001, Portugal |
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| Abstract: | An extensive experimental investigation on four SWATH hull forms has been conducted in calm water and in regular waves at University of Naples Federico II. Calm water tests have been analyzed in the range of Froude number FrT from 0.1 to 0.6. For all four SWATH configurations at the speed, corresponding to FrT 0.32, the behaviour in regular waves has been tested. The results of heave, pitch and vertical accelerations are presented in nondimensional form as RAO. For the “most promising” SWATH #4 configuration, a set of stabilizing fins have been designed and an active stabilization system has been developed. The developed SWATH#5 has been tested in calm water on three displacements in the range of FrT from 0.1 to 0.65. The dynamic wetted surface has been identified and the residual resistance coefficient CR as well as RT/Δ are reported. Seakeeping tests have been performed in regular head sea and in head and following irregular sea at FrT = 0.50. The conditions for the occurrence of dynamic longitudinal instabilities have been identified. The results allows to comment the effect of slenderness of struts and SWATH’s immersed bodies on resistance and seakeeping and concerns the applicability of SWATH concept to small craft. |
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| Keywords: | SWATH vessel Experimental fluid dynamics (EFD) CFD Active fins stabilization system Resistance Seakeeping |
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