Browse > Article
http://dx.doi.org/10.5574/IJOSE.2012.2.3.176

Numerical Study on Floating-Body Motions in Finite Depth  

Kim, Tae-Young (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Kim, Yong-Hwan (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Publication Information
International Journal of Ocean System Engineering / v.2, no.3, 2012 , pp. 176-184 More about this Journal
Abstract
Installing floating structures in a coastal area requires careful observation of the finite-depth effect. In this paper, a Rankine panel method that includes the finite-depth effect is developed in the time domain. The bottom boundary condition is satisfied by directly distributing Rankine panels on the bottom surface. A stepwise analysis is performed for the radiation diffraction problems and consequently freely-floating motion responses over different water depths. The hydrodynamic properties of two test hulls, a Series 60 and a floating barge, are compared to the results from another computation program for validation purposes. The results for both hulls change remarkably as the water depth becomes shallower. The important features of the results are addressed and the effects of a finite depth are discussed.
Keywords
Finite-depth effect; Rankine panel method; Time-domain analysis; Floating body;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Clauss, G., Stempinski, F., Dudek, M., and Klein, M., Water depth influence on wavestructure- interaction, Ocean Engineering, 36 (17-18) (2009), 1396-1403.   DOI   ScienceOn
2 Fonseca, N., Pessoa, J., Mavrakos, S. and Boulluec, M.L., Experimental and numerical investigation of the slowly varying wave exciting drift forces on a restrained body in bichromatic waves, Ocean Engineering, 38 (17-18) (2011), 2000-2014.   DOI   ScienceOn
3 Nakos, D.E., Stability of transient gravity waves on a discrete free surface, MIT Report, MIT (1993).
4 Tuck, E.O., Ship motions in shallow water, J. of Ship Research, 14 (4) (1970), 317-328.
5 Tasai, F., Takagi, M. and Ohkusu, M., Ship motions in restricted waters, Reports of Research Institute for Applied Mechanics, Kyushu University 26 (81) (1978).
6 Andersen, P., Ship Motions and Sea Loads in Restricted Water Depth, Ocean Engineering, 6 (6) (1979), 557-569.   DOI   ScienceOn
7 Perunovic, J.V. and Jensen, J.J., Wave loads on ships sailing in restricted water depth, Marine Structures, 16 (6) (2003), 469-485.   DOI   ScienceOn
8 Kim, Y., Computation of Higher-Order Hydrodynamic Forces on Ships and Offshore Structures in Waves, Ph.D. Thesis, MIT (1999).
9 Oortmerssen, G.V., The motions of a ship in shallow water, Ocean Engineering, 3 (4) (1976), 221-255.   DOI   ScienceOn
10 Lee, C.H., WAMIT Theory Manual, MIT Report 95-2, MIT (1995).
11 Grant, R. and Holboke M., Shallow water effects on low-frequency wave excitation of moored ships. Offshore Technology Conference (OTC2004), Houston, USA, May 3-6, (2004).
12 Naciri, M., Design aspects of SPM LNG terminals in shallow water. Offshore Technology Conference (OTC2004), Houston, USA, May 3-6, (2004).
13 Zou, J., Global dynamic responses of FPSOs in shallow waters. 16th International Offshore and Polar Engineering Conference (ISOPE2006), San Francisco, USA, May 28-June 2, (2006).