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On natural modes in moonpools with recesses |
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| Institution: | 1. Aix Marseille Univ, CNRS, Centrale Marseille, IRPHE, Marseille, France;2. Bureau Veritas Marine & Offshore SAS, 67/71 Boulevard du Château, 92571 Neuilly sur Seine, France;1. Ramboll, Hannemanns Allé 53, DK-2300 Copenhagen S, Denmark;2. Mechanical Engineering, Technical University of Denmark, 2800 Lyngby, Denmark;1. Department of Ocean System Engineering, Jeju National University, Jeju 690-756, Korea;2. Department of Civil Engineering, Texas A&M University, College Station, Texas, 77843, USA |
| Abstract: | The theoretical model of Molin 6] is extended to the case of rectangular moonpools with one or two recesses, as can be found in some drillships. Obtained natural frequencies and modal shapes of the piston and first sloshing modes are compared with experimental results available in literature, with good agreement. An approximation easy to implement is proposed for the natural frequency of the piston mode. Further illustrative results are presented when some geometrical parameters of the moonpool are being varied. |
| Keywords: | Drillship Moonpool resonance Piston mode Sloshing mode Linearized potential flow theory |
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