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Computation of the Green Water Design Impact Loads Acting on the Box-Type Structure of a High-Speed Ship's Bow

고속선박의 선수부 상자형 구조물에 작용하는 Green Water 설계 충격하중의 산출

  • Kim, Yong Jig (Department of Naval Architecture and Marine Systems Engineering, Pukyong National University) ;
  • Kim, In Chul (Department of Naval Architecture and Marine Systems Engineering, Pukyong National University) ;
  • Shin, Sangmook (Department of Naval Architecture and Marine Systems Engineering, Pukyong National University)
  • 김용직 (부경대학교 조선해양시스템공학과) ;
  • 김인철 (부경대학교 조선해양시스템공학과) ;
  • 신상묵 (부경대학교 조선해양시스템공학과)
  • Received : 2016.09.05
  • Accepted : 2016.12.23
  • Published : 2017.02.20

Abstract

In rough seas, green water shipped on board may impose quite large impact loads on the structures on deck and sometimes result in structure damages. One of the essential tasks of the naval fluid engineers is to provide the design impact loads which are needed for proper design of the structure strength against the green water impacts. Computation of the design impact load due to green water needs first a process to find the sea condition and the ship cruising condition which cause maximum green water impacts on structures as well as other succeeding processes to compute ship motion responses, green water flows and impact loads. Also, as a bold and practical process, it is needed that the irregular real seas are to be substituted by design regular waves which are equivalent in view points of green water impacts. In this paper, the whole processes to compute the design green water loads acting on bow structure are set up creatively. And the green water design impact loads acting on the box-type structure of a high-speed ship's bow are computed and discussed.

Keywords

References

  1. Beck, R.F. Cummins, W.E. Dalzell, J.F. Mandel P. & Webster, W.C., 1989. Principles of naval architecture - 2nd revision, Chapter 8 Motions in waves. SNAME: Jersey City.
  2. Buchner, B., 1995. On the impact of green water loading on ship and offshore unit design. PRADS '95, Seoul, pp.430-443.
  3. Buchner, B., 1996. The influence of the bow shape of FPSOs on drift forces and green water. OTC paper no. 8073, Offshore Technology Conference 96, Houston, pp.389-400.
  4. Ha, Y.J. Lee, Y.G. & Jeong K.Y., 2012. An experimental study on the effects of bow flare angle about green water in regular waves. Journal of the Society of Naval Architects of Korea, 49(1), pp. 79-86. https://doi.org/10.3744/SNAK.2012.49.1.79
  5. Hwang, J.H. Kim, Y.J. & Kim, S.Y., 1985. On the nonlinear hydrodynamic forces due to large amplitude forced oscillations. Journal of the Society of Naval Architects of Korea, 22(3), pp.1-8.
  6. Jeong, K.L. Lee, Y.G. & Ha, Y.J. 2013. Experimental and numerical study on the effects of bow deck shape on the green water. Journal of the Society of Naval Architects of Korea, 50(5), pp.273-281. https://doi.org/10.3744/SNAK.2013.50.5.273
  7. Jeong, K.L. Lee, Y.G. & Kim, N.C., 2010. A fundamental study for the numerical simulation method of green water occurrence on bow. Journal of the Society of Naval Architects of Korea, 47(2), pp.188-195. https://doi.org/10.3744/SNAK.2010.47.2.188
  8. Kim, Y.J. & Kim, I.C., 1996. Numerical simulation of Two-dimensional shipping water by using a simplified model. Journal of the Society of Naval Architects of Korea, 33(2), pp.1-12.
  9. Kim, Y.J. & Shin, K.S., 2005. Numerical calculation and experiment of green water on the bow deck in regular waves. Journal of the Society of Naval Architects of Korea, 42(4), pp.350-356. https://doi.org/10.3744/SNAK.2005.42.4.350
  10. Lee, C.S. Heo, H.S. Kim, Y.N. Kim, M.H. Kim, S.H. & Lee, J.M., 2012. Investigation of structural responses of breakwaters for green water based on fluid-structure interaction analysis. International Journal of Naval Architecture and Ocean Engineering, 4, pp.83-95. https://doi.org/10.2478/IJNAOE-2013-0080
  11. Mitsui Shipbuilding & Engineering Co., Ltd., 1975. A computer program for theoretical calculation of sea-keeping quality of ships. Japan Shipbuilding & Marine Engineering, 9(3).
  12. Mizoguchi, S., 1988. Analysis of shipping water with the experiments and the numerical calculations. Journal of the Society of Naval Architects of Japan, 163, pp.150-159.
  13. Pekken, G. Veldman, A.E.P. & Buchner, B., 1999. Simulation of green water loading using the Navier-Stokes equations. 7th International Conferences on Numerical Ship Hydrodynamics, Nantes.
  14. Pham, X.P. & Varyani, K.S., 2005. Evaluation of green water loads on high-speed containership using CFD. Ocean Engineering, 32, pp.571-585. https://doi.org/10.1016/j.oceaneng.2004.10.009
  15. Tasai, F. & Tagaki, M., 1969. Theory and calculation of ship responses in regular wave. Symposium on Seaworthiness of Ships, SNAJ, Tokyo.