DOI QR코드

DOI QR Code

The effect of small forward speed on prediction of wave loads in restricted water depth

  • Guha, Amitava (Marine Dynamics Laboratory, Department of Ocean Engineering, Texas A&M University) ;
  • Falzarano, Jeffrey (Marine Dynamics Laboratory, Department of Ocean Engineering, Texas A&M University)
  • 투고 : 2016.08.19
  • 심사 : 2016.10.14
  • 발행 : 2016.12.25

초록

Wave load prediction at zero forward speed using finite depth Green function is a well-established method regularly used in the offshore and marine industry. The forward speed approximation in deep water condition, although with limitations, is also found to be quite useful for engineering applications. However, analysis of vessels with forward speed in finite water depth still requires efficient computing methods. In this paper, a method for analysis of wave induced forces and corresponding motion on freely floating three-dimensional bodies with low to moderate forward speed is presented. A finite depth Green function is developed and incorporated in a 3D frequency domain potential flow based tool to allow consideration of finite (or shallow) water depth conditions. First order forces and moments and mean second order forces and moments in six degree of freedom are obtained. The effect of hull flare angle in predicting added resistance is incorporated. This implementation provides the unique capability of predicting added resistance in finite water depth with flare angle effect using a Green function approach. The results are validated using a half immersed sphere and S-175 ship. Finally, the effect of finite depth on a tanker with forward speed is presented.

키워드

과제정보

연구 과제 주관 기관 : Office of Naval Research

참고문헌

  1. Boese, P. (1970), "Eine einfache methode zur berechnung der widerstandserhöhung eines schiffes im seegang", J. Schiffstechnik, 17(86), 1-18.
  2. Faltinsen, O., Minsaas, K., Liapis, N. and Skjordal, S. (1980), "Prediction of resistance and propulsion of a ship in a seaway", Proceedings of the 13th Symposium on Naval Hydrodynamics, Tokyo, Japan.
  3. Grue, J. and Biberg, D. (1993), "Wave forces on marine structures with small speed in water of restricted depth", App. Ocean Res., 15(3), 121-135. http://doi.org/10.1016/0141-1187(93)90036-W
  4. Guha, A. (2012), Development of a computer program for three dimensional frequency domain analysis of zero speed first order wave body interaction (Thesis). Texas A&M University, College Station, TX.
  5. Guha, A. (2016), Development and application of a potential flow computer program: Determining first and second order wave forces at zero and forward speed in deep and intermediate water depth. Texas A&M University, College Station, TX.
  6. Guha, A. and Falzarano, J. (2015), "The effect of hull emergence angle on the near field formulation of added resistance", Ocean Eng., 105(1), 10-24. http://doi.org/10.1016/j.oceaneng.2015.06.012
  7. Guha, A. and Falzarano, J. (2016), "Estimation of hydrodynamic forces and motion of ships with steady forward speed", Int. Shipbuild. Prog., 62(3-4), 113-138. http://doi.org/10.3233/ISP-150118
  8. Guha, A. and Falzarano, J.M. (2013), "Development of a computer program for three dimensional analysis of zero speed first order wave body interaction in frequency domain", Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering, Nantes, France. http://doi.org/10.1115/OMAE2013-11601
  9. Hess, J.L. and Smith, A.M. (1964), "Calculation of non-lifting potential flow about arbitrary three-dimensional bodies", J. Ship Res., 8(3), 22-44.
  10. John, F. (1949), "On the motion of floating bodies I", Commun. Pure Appl. Math., 2(1), 13-57. https://doi.org/10.1002/cpa.3160020102
  11. John, F. (1950), "On the motion of floating bodies II. Simple harmonic motions", Commun. Pure Appl. Math., 3(1), 45-101. https://doi.org/10.1002/cpa.3160030106
  12. Lee, C.H. (2013), WAMIT User Manual. Chestnut Hill, MA, USA.
  13. Li, L. (2001), Numerical seakeeping predictions of shallow water effect on two ship interactions in waves. Dalhousie University.
  14. Maruo, H. (1960), Wave resistance of a ship in regular head seas, Bulletin of the Faculty of Engineering, Yokohama National University, 9(March).
  15. McTaggart, K.A. (2002), Three dimensional ship hydrodynamic coefficients using the zero forward speed Green function (Report) (Vol. 59), Defence Research Development Canada, Ottawa.
  16. Monacella, V.J. (1966), "The disturbance due to a slender ship oscillating in waves in a fluid of finite depth", J. Ship Res., 10(4), 242-252.
  17. Newman, J. (1990), "Numerical solutions of the water-wave dispersion relation", Appl. Ocean Res., 12(1), 14-18. http://doi.org/10.1016/S0141-1187(05)80013-6
  18. Pinkster, J.A. (1979), "Mean and low frequency wave drifting forces on floating structures", Ocean Eng., 6(1), 593-615. https://doi.org/10.1016/0029-8018(79)90010-6
  19. Salvesen, N., Tuck, E.O. and Faltinsen, O.M. (1970). "Ship motions and sea loads", T. Soc. Naval Archit. Marine Engineers, 78, 250-287.
  20. Wehausen, J.V. and Laitone, E.V. (1960), "Surface waves", Encyclopedia Phys., 9, 446-815.

피인용 문헌

  1. A more efficient numerical evaluation of the green function in finite water depth vol.7, pp.4, 2016, https://doi.org/10.12989/ose.2017.7.4.399
  2. Numerical Study on Change of Added Resistance due to Incident Waves in Finite Water Depth vol.145, pp.6, 2016, https://doi.org/10.1061/(asce)ww.1943-5460.0000526
  3. An optimization framework of a parametric Octabuoy semi-submersible design vol.12, pp.None, 2020, https://doi.org/10.1016/j.ijnaoe.2020.09.002