Analysis of hydrodynamic characteristics for arbitrary multihull ships advancing in waves

Original Article

Abstract

Multihull vessels have emerged as popular alternatives to conventional monohull ships for high-speed crafts. However, the bridging structures connecting the hulls are vulnerable to various wave actions and the wave impact on the bottom of them is the most serious problems associated with multihulled vessels. In this study, prediction of relative wave elevations under the bridging structures is investigated for multihull ships traveling with forward speed in waves. A computer code YNU-SEA using the three-dimensional (3D) Green function method with forward speed has been developed and used to analyze the hydrodynamic radiation and diffraction forces and motion responses for high-speed catamarans in waves. The results of the present calculations are compared with those of previous calculations as well as with experimental results. The numerical results reveal that the present computer code can be used as a powerful tool for the accurate numerical computation of seakeeping problems for multihull ships advancing in waves. Numerical calculations of wave pattern are also carried out including wave interactions between the hulls to analyze the effects of hull form on the free surface flow around catamarans advancing in waves. The analysis of the wave pattern allows the determination of relative wave height including radiation and diffraction waves. Finally, some discussions are included based on these numerical results which may be helpful for the accurate prediction of relative wave height and wave breaking load on the deck associated with multihull ships.

Keywords

Seakeeping Multihull ship Forward speed 3D Green function 

References

  1. 1.
    Chang MS (1977) Computations of three dimensional ship motions with forward speedproc. Second conference on numerical ship hydrodynamics. University of California, Berkeley, pp 124–135Google Scholar
  2. 2.
    Inglis RB, Price WG (1980) Calculation of velocity potential of a translating, pulsating source. Trans RINA 123:163–175Google Scholar
  3. 3.
    Noblesse F, Hendrix D (1992) On the theory of potential flow about a ship advancing in waves. J Ship Res 36(1):17–30Google Scholar
  4. 4.
    Guevel P, Bougis J (1982) Ship motions with forward speed in infinite depth. Int Shipbuilding Prog 29:103–117Google Scholar
  5. 5.
    Wu GX, Taylor ER (1987) A green function form for ship motions at forward speed. Int Shipbuilding Prog 34:189–196Google Scholar
  6. 6.
    Iwashita H, Ohkushu M (1992) Green function method for ship motions at forward speed. Ship Technol Res 39(2):3–22Google Scholar
  7. 7.
    Malick Ba, Gulibaud M (1995) A fast method of evaluation for the translating and pulsating Green’s function. Ship Technol Res 42:68–80Google Scholar
  8. 8.
    Boin JP, Gulibaud M, Malick Ba (2000) Seakeeping computations using the ship motions green functions. In: Proceedings of the 10th international offshore and polar engineers conference (ISOPE), Seattle, vol 3, pp 398–405Google Scholar
  9. 9.
    Maury C, Delhommeau, Malick Ba, Boin JP, Gulibaud M (2000) Comparisons between numerical computations and experiments for seakeeping on ship models with forward speed. J Ship Res 47(4):347–364Google Scholar
  10. 10.
    Inoue Y, Makino Y (1989) The influence of forward speed upon the three dimensional hydrodynamic forces. J JSNAJ 166:207–214Google Scholar
  11. 11.
    Iwashita H (1998) Seakeeping computations of a blunt ship capturing the influence of the steady flow. Ship Technol Res 45:159–171Google Scholar
  12. 12.
    Inoue Y, Kamruzzaman M (2004) A Numerical calculation of hydrodynamic forces on a seagoing ship by 3-d source technique with forward speed. In: Proceedings of the 23rd international conference on offshore mechanics and arctic engineering (OMAE), Vancouver, June 2004Google Scholar
  13. 13.
    Inoue Y, Kamruzzaman M (2006) A study of dynamic responses and wave loads on ships by 3-D Green function method. In: Proceedings of the 25th international conference on offshore mechanics and arctic engineering (OMAE), Hamburg, Germany, June 2006Google Scholar
  14. 14.
    Inoue Y, Zakaria NMG M (2006) Numerical analysis on added resistance of ship by 3-D Green function method. In: Proceedings of the 25th international conference on offshore mechanics and arctic engineering (OMAE), Hamburg, Germany, June 2006Google Scholar
  15. 15.
    Ohkusu M (1974) Hydrodynamic forces on multiple cylinders in waves. In: Proceedings of international symposium on the dynamics of marine vehicles and structures in waves, pp 107–112, Institute of Mechanical EngineersGoogle Scholar
  16. 16.
    Simon MJ (1982) Multiple scattering in arrays of axissymemetric wave-energy devices. Part1—a matrix method using a plane wave approximation. J Fluid Mech 120:1–25MATHCrossRefMathSciNetGoogle Scholar
  17. 17.
    Newman JN (1978) The theory of ship motions. Adv Appl Mech 18:221–283CrossRefGoogle Scholar
  18. 18.
    Breit SR, Sclavounos (1986) Wave interaction between the adjacent slender bodies. J Fluid Mech 165:273–296Google Scholar
  19. 19.
    Kring D, Sclavounos (1991) A new method for analyzing the seakeeping of multi hull ships. In: Proceedings of the first international conference on fast sea transportation (FAST’91), vol 1, pp 429–444Google Scholar
  20. 20.
    Kashiwagi M (1993) Interaction forces between twin hulls of a catamaran advancing in waves (Part1—radiation problem). J JSNAJ 173:119–131Google Scholar
  21. 21.
    Kashiwagi M (1993) Interaction forces between twin hulls of a catamaran advancing in waves (Part2—wave exciting forces and motions in waves). J JSNAJ 174:181–191Google Scholar
  22. 22.
    Kashiwagi M (1993) Heave and pitch motions of a catamaran advancing in waves. In: Proceedings of the 2nd international conference on fast sea transportation (FAST’93), vol 2, pp 643–655Google Scholar
  23. 23.
    Iwashita H, Kataoka S (1996) 3D Analysis of the hydrodynamic interaction between steady and unsteady flows for a catamaran. In: Proceedings of Korea and Japan joint workshop on marine hydrodynamics (KOJAM’96), Taejon, Korea, pp 1–9Google Scholar
  24. 24.
    Molland A et al (2001) Experimental investigation of the seakeeping characteristics of fast displacement catamarans in head and oblique waves. Trans RINA 143:79–98Google Scholar
  25. 25.
    Wehausen JY, Laitone EV (1960). Surface waves. Hundbuck der Physic, vol 9, pp 446–778Google Scholar
  26. 26.
    Brard R (1972) The representation of a given ship form by singularity distribution when the boundary condition of the free surface is linearized. J Ship Res 16(1):79–92Google Scholar
  27. 27.
    Takagi M, Arai S (1996) The theory of the radiation and diffraction waves due to ships and offshore structures. Seizando, TokyoGoogle Scholar
  28. 28.
    Hess JL, Smith AMO (1964) Calculation of nonlifting potential flow about arbitrary three dimensional bodies. J Ship Res 8(2):22–44Google Scholar
  29. 29.
    Inoue Y, Tareque M (2003) Time domain simulation of side-by-side moored LNG FPSO system. Conference proceedings, The Society of Naval Architects of Japan (SNAJ), vol 2, pp 119–120Google Scholar
  30. 30.
    Inoue Y, Kamruzzaman M (2007) Hydrodynamic analyses of high speed transom stern hull forms in waves by 3D green function method. In: Proceedings of 2nd international conference on marine research and transportation (ICMRT–2007), Italy, pp 175–182Google Scholar

Copyright information

© JASNAOE 2008

Authors and Affiliations

  1. 1.Graduate School of Environment and Information SciencesYokohama National UniversityYokohamaJapan
  2. 2.Nippon Kaiji Kyokai, ClassNKTokyoJapan

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