DOI QR코드

DOI QR Code

Horizontal hydrodynamic coupling between shuttle tanker and FPSO arranged side-by-side

  • Wang, Hong-Chao (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University) ;
  • Wang, Lei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
  • 투고 : 2012.09.27
  • 심사 : 2013.11.20
  • 발행 : 2013.12.25

초록

Side-by-side offloading operations are widely utilized in engineering practice. The hydrodynamic interactions between two vessels play a crucial role in safe operation. This study focuses on the coupled effects between two floating bodies positioned side-by-side as a shuttle tanker-FPSO (floating production, storage and offloading) system. Several wave directions with different side-by-side distances are studied in order to obtain the variation tendency of the horizontal hydrodynamic coefficients, motion responses and mean drift forces. It is obtained that the coupled hydrodynamics between two vessels is evidently distinguished from the single body case with shielding and exaggerating effects, especially for sway and yaw directions. The resonance frequency and the peak amplitude are closely related with side-by-side separation distance. In addition, the horizontal hydrodynamics of the shuttle tanker is more susceptible to coupled effects in beam waves. It is suggested to expand the gap distance reasonably in order to reduce the coupled drift forces effectively. Attention should also be paid to the second peaks caused by hydrodynamic coupling. Since the horizontal mean drift forces are the most mainly concerned forces to be counteracted in dynamic positioning (DP) system and mooring system, prudent prediction is beneficial in saving consumed power of DP system and reducing tension of mooring lines.

키워드

참고문헌

  1. Chen, X.B. (2007), "Middle-field formulation for the computation of wave-drift loads", J. Eng. Math, 59(1), 61-82. https://doi.org/10.1007/s10665-006-9074-x
  2. Choi, Y.R. and Hong, S.Y. (2002), "An analysis of hydrodynamic interaction of floating multi-body using higher-order boundary element method", Proceedings of the 12th ISOPE,Kitakyushu, Japan.
  3. Dai, Y.S. (1998), Potential flow theory of ship motions in waves in frequency and time domain (in Chinese), Press of the National Defense Industries, Beijing, China.
  4. Huijsmans, R.H.M., Pinkster, J.A. and de Wilde, J.J. (2001), "Diffraction and radiation of waves around side-by-side moored vessels", Proceedings of the 11th ISOPE, Stavanger, Norway.
  5. Kang, H.Y. and Kim, M.H. (2012), "Hydrodynamic interactions and coupled dynamics between a container ship and multiple mobile harbors", Ocean Syst. Eng., 2(3), 217-228. https://doi.org/10.12989/ose.2012.2.3.217
  6. Kodan, N. (1984), "The motions of adjacent floating structures in oblique waves", Proceedings of the 3rd Offshore Mechanics and Arctic Engineering, New Orleans, USA.
  7. Kristiansen, T. and Faltinsen, O.M. (2010), "A two-dimensional numerical and experimental study of resonant coupled ship and piston-mode motion", Appl. Ocean Res., 32(2), 158-176. https://doi.org/10.1016/j.apor.2009.10.001
  8. Lee, S.J., Kim, M.H., Lee, D.H., Kim, J.W. and Kim, Y.H. (2007), "The effects of LNG-tank sloshing on the global motions of LNG carriers", J. Ocean Eng., 34(1),10-20. https://doi.org/10.1016/j.oceaneng.2006.02.007
  9. Lu, L., Teng, B., Sun, L. and Chen, B. (2011), "Modeling of multi-bodies in close proximity under water waves- Fluid forces on floating bodies", J. Ocean Eng., 38(13), 1403-1416. https://doi.org/10.1016/j.oceaneng.2011.06.008
  10. Malenica, S. and Chen, X.B. (1998), On the irregular frequencies appearing in wave diffraction-radiation solutions, International Offshore and Polar Engineering, Montreal, Canada.
  11. Masashi, K. (2005), "Wave drift forces and moments on two ships arranged side by side in waves", J. Ocean Eng., 32(5-6), 529-555. https://doi.org/10.1016/j.oceaneng.2004.09.005
  12. Mirela, Z. (2007), "Sloshing effects accounting for dynamic coupling between vessel and tank liquid motion", Proceedings of the 26th OMAE, San Diego, USA.
  13. Newman, J.N. (1992), "The approximation of free-surface Green functions", Proceedings of the F. Ursell Retirement Meeting, Cambridge University Press.
  14. Noblesse, F. (1982), "The Green function in the theory of radiation and diffraction of regular waves by a body", J. Eng. Math, 16(2), 137-169. https://doi.org/10.1007/BF00042551
  15. Ohkusu, M. (1976), "Ship motions in vicinity of a structure", Proceedings of the 1st International Conference on the Behavior of Off-Shore Structures, Trondheim, Norway.
  16. Zhao, W.H., Yang J.M. and Hu Z.Q. (2012), "Hydrodynamic interaction between FLNG Vessel and LNG Carrier in side by side configuration", J. Hydrodynamics, 24(5), 649-657.