Experimental study on piston- and sloshing- mode moonpool resonances |
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Authors: | Seung-Ho Yang Sang-Beom Lee Jung-Ho Park Seung-Yoon Han Young-Myung Choi Jitae Do Sun-Hong Kwon Bernard Molin |
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Affiliation: | 1.Department of Naval Architecture and Ocean Engineering,Ulsan College,Ulsan,Korea;2.Department of Naval Architecture and Ocean Engineering,Pusan National University,Busan,Korea;3.école Centrale de Marseille and IRPHé,Marseille,France |
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Abstract: | An experimental study was performed on the piston- and sloshing-mode moonpool resonances of offshore structures. Two different geometries were considered to investigate the flow characteristics in a plain moonpool and a moonpool with a cofferdam. To examine the efficiency of a cofferdam for reducing the flow in a moonpool, three cofferdam geometries were tested. The plain moonpool presented violent flows as a result of the piston- and sloshing-mode resonances. However, the moonpool with the cofferdam introduced violent sloshing waves instead of the ascent and descent of the water column in the piston-mode moonpool resonance. Among three different cofferdam geometries, the model with a right triangle facing to the left on the top of the cofferdam was most effective in reducing the flow in the moonpool when compared with the other models. |
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