[논문]Numerical Study on Floating-Body Motions in Finite Depth

Kim, Tae-Young; Kim, Yong-Hwan

doi:10.5574/ijose.2012.2.3.176

Numerical Study on Floating-Body Motions in Finite Depth 원문보기

International journal of ocean system engineering, v.2 no.3, 2012년, pp.176 - 184

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)

Abstract ▼ AI-Helper

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.

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가설 설정

This is understandable from the difference between the wave contours around the bow and stern in Fig. 11. Such longitudinal asymmetry becomes stronger in this case, and a larger pitch moment is generated.

제안 방법

The motion responses of floating bodies in a finite depth were considered by using a Rankine panel method in the time domain. To verify the effect of the finite depth, the hydrodynamic coefficients, exciting force, and motion responses were calculated for various water depths. The results showed a good correspondence with those of the finite-depth unified theory.

이론/모형

The hydrodynamic pressure can be obtained by using Bernoulli equation. The integration of the pressure gives the wave force, as in Eq.
The motion responses of floating bodies in a finite depth were considered by using a Rankine panel method in the time domain. To verify the effect of the finite depth, the hydrodynamic coefficients, exciting force, and motion responses were calculated for various water depths.
This study was carried out as a part of WISHOFFSHORE JIP, which is funded by ABS, ClassNK, DSME, HHI, KR, SHI, and STX Offshore and Shipbuilding. Their support is appreciated.

후속연구

Based on this study, it is expected that the present method is applicable for various problems related to the motion dynamics of floating bodies in finite depths. This method can be easily extended to the prediction of floating-body responses in an arbitrary bathymetry

참고문헌 (13)

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상세보기
Andersen, P., Ship Motions and Sea Loads in Restricted Water Depth, Ocean Engineering, 6 (6) (1979), 557-569.

상세보기
Perunovic, J.V. and Jensen, J.J., Wave loads on ships sailing in restricted water depth, Marine Structures, 16 (6) (2003), 469-485.

상세보기
Kim, Y., Computation of Higher-Order Hydrodynamic Forces on Ships and Offshore Structures in Waves, Ph.D. Thesis, MIT (1999).
Oortmerssen, G.V., The motions of a ship in shallow water, Ocean Engineering, 3 (4) (1976), 221-255.

상세보기
Lee, C.H., WAMIT Theory Manual, MIT Report 95-2, MIT (1995).
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).
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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).
Clauss, G., Stempinski, F., Dudek, M., and Klein, M., Water depth influence on wavestructure- interaction, Ocean Engineering, 36 (17-18) (2009), 1396-1403.

상세보기
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.

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Nakos, D.E., Stability of transient gravity waves on a discrete free surface, MIT Report, MIT (1993).

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Numerical Study on Floating-Body Motions in Finite Depth 원문보기

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Numerical Study on Floating-Body Motions in Finite Depth 원문보기

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