Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Analysis on Motion Responses and Transmission Coefficients of a Moored Floating Breakwater in Oblique Incident Waves

경사 입사파중 계류된 부유식 방파제의 운동응답과 투과율 해석

  • Published : 2009.06.30
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Abstract

Based on the boundary element method, the motion responses and transmission coefficients of a moored floating breakwater were investigated in oblique waves. To satisfy the outgoing radiation condition in the far field, the fluid domain was divided into inner and outer regions. The complete solution could be obtained by applying the matching conditions between the eigenfunction-based outer solution and BEM-based inner solution. Using the developed predictive tools, the wave exciting forces, added mass, damping coefficients, motion responses, and transmission coefficients were assessed for various combinations of breakwater configuration, wave heading, mooring cables properties, and wave characteristics. It was found that the transmission coefficient for a moored floating breakwater was closely dependent on the motion responses, which were greatly amplified at the resonant frequencies.

Keywords

References

  1. 김도삼, 이광호, 최낙훈, 윤희면 (2004). "신형식 부방파제의 파랑제어에 관한 연구", 한국해안·해양공학회지, 제16권 제1호, pp 1-9
  2. 마산지방해양수산청 (2002). 원전항건설공사 부방파제 실험보고서
  3. Abul-Azm, A.G. and Gesraha, M.R. (2000). "Approximations to the Hydrodynamics of Floating Pontoons under Oblique Waves", Ocean Eng., Vol 27, No 4, pp 365-384 https://doi.org/10.1016/S0029-8018(98)00057-2
  4. Bai, K.J. (1975). "Diffraction of Oblique Waves by an Infinite Cylinder", J. Fluid Mech., Vol 68, No 3, pp 513-535 https://doi.org/10.1017/S0022112075001802
  5. Garrison, C.J. (1984). "Interaction of Oblique Waves with an Infinite Cylinder", Appl. Ocean Res., Vol 6, No 1, pp 4-15 https://doi.org/10.1016/0141-1187(84)90023-3
  6. Gesraha, M.R. (2004). "An Eigenfunction Expansion Solution for Extremely Flexible Floating Pontoons in Oblique Waves", Appl. Ocean Res., Vol 26, pp 171-182 https://doi.org/10.1016/j.apor.2005.05.002
  7. Isaacson, M. and Nwogu, O.U. (1987). "Wave Loads and Motions of Long Structures in Directional Seas", J. Offshore Mech. Eng., Vol 109, pp 126-132 https://doi.org/10.1115/1.3257000
  8. Leonard, J.W., Huang, M.C. and Hudspeth, R.T. (1983). "Hydrodynamic Interference between Floating Cylinders in Oblique Seas", Appl. Ocean Res., Vol 5, No 3, pp 158-166 https://doi.org/10.1016/0141-1187(83)90071-8
  9. McDougal, W.G. and Sulisz, W. (1989). "Sea Bed Stability Near Floating Structures. Wave Loads and Motions of Long Structures in Directional Seas", J. Waterway, Port, Coastal, and Ocean Eng. ASCE, Vol 115, No 6, pp 727-739 https://doi.org/10.1061/(ASCE)0733-950X(1989)115:6(727)
  10. Sannasiraj, S.A., Sundar, V. and Sundaravadivelu, R. (1998). "Mooring Forces and Motion Responses of Pontoon-Type Floating Breakwater", Ocean Eng., Vol 25, No 1, pp 27-48 https://doi.org/10.1016/S0029-8018(96)00044-3
  11. Politis, C.G., Papalexandris, M.V. and Athanassoulis, G.A. (2002). "A Boundary Integral Equation Method for Oblique Water-wave Scattering by Cylinders Governed by the Modified Helmholtz Equation", Appl. Ocean Res., Vol 24, No 4, pp 215-233 https://doi.org/10.1016/S0141-1187(02)00047-0
  12. Zheng, Y.H,, Shen Y.M., You, Y.G., Wu, B.J. and Jie, D.S. (2006). "Wave Radiation by a Floating Rectangular Structure in Oblique Seas", Ocean Eng., Vol 33, pp 59-81 https://doi.org/10.1016/j.oceaneng.2005.04.005
  13. Zheng, Y.H,, Shen Y.M. and Ng, C.O. (2008). "Effective Boundary Element Method for the Interaction of Oblique Waves with Long Prismatic Structures in Water of Finite Depth", Ocean Eng., Vol 35, pp 494-502 https://doi.org/10.1016/j.oceaneng.2007.12.003