Experimental Study on the Eddy Making Damping Effect at the Roll Motion of a Rectangular Barge

사각형 바지선의 횡동요 와류 감쇠에 대한 실험적 연구

  • Jung, Kwang-Hyo (Department of Naval Architecture and Ocean Engineering, Dong-Eui University) ;
  • Suh, Sung-Bu (Department of Naval Architecture and Ocean Engineering, Dong-Eui University) ;
  • Chun, Ho-Hwan (Department of Naval Architecture and Ocean Engineering, Pusan National University)
  • 정광효 (동의대학교 조선해양공학과) ;
  • 서성부 (동의대학교 조선해양공학과) ;
  • 전호환 (부산대학교 조선해양공학과)
  • Published : 2007.06.20


This experimental study investigated on the eddy making effect on the roll motion of a rectangular barge in a two-dimensional wave tank. The structure was used to simulate a simplified rectangular barge in the beam sea condition. The structure with a draft one half of its height was hinged at the center of gravity and free to roll by waves. The rectangular barge was tested with regular waves with a range of wave periods that are shorter, equal to, and longer than its roll natural period. Particle image velocimetry (PIV) was employed to obtain the velocity field in the vicinity of the structure. The coupled interactions between the incident wave and the barge were demonstrated by examining the vortical flow fields to elucidate the eddy making effect during the roll motion. For incoming wave with a wave period same as the roll natural period, the barge roll motion was reduced by the eddy making damping effect. At the wave period shorter than the roll natural period, the structure roll motion was slightly reduced by the vertical flow around the barge. However, at the wave period longer than the roll natural period, the eddy making effect due to flow separation at structure corners indeed amplifies the roll motion. This indicates that not only can the eddy making effect damp out the roll motion, it can also increase the roll motion.


  1. Bearman, P.W., Downie, M.J., Graham, J.M. R. and Obasaiu, F.D., 1985, 'Forces on Cylinders in Viscous Oscillatory Flow at Low Keulegan-Carpenter Numbers,' Journal of Fluid Mechanics, Vol. 154, pp. 337-356
  2. Bhattacharyya, R., 1978, Dynamics of Marine Vehicles, John Wiley & Sons, Inc., New York
  3. Chakrabarti, S., 2001, 'Empirical Calculation of Roll Damping of Ships and Barges,' Ocean Engineering, Vol. 28, No. 7, pp. 915-932
  4. Chen, H.C., Liu, T, Chang, K.A. and Huang, E.T., 2002, 'Time-domain Simulation of Barge Capsizing by a Chimera Domain Decomposition Approach,' 12th International Offshore and Polar Engineering Conference, KitaKyushu, Japan, May 26-31, pp. 314-321
  5. Cozen. P.D., 1987, Numerical Modeling of the Roll Damping of Ships Due to Vortex Shedding, Ph.D dissertation. London University, U.K
  6. Dong, R.R., Katz, J. and Huang, T.T., 1997, 'On the Structure of Bow Waves on a Ship Model,' Journal of Fluid Mechanics, Vol. 346, pp. 77-115
  7. Downie, M.J., Bearman, P.W. and Graham, J.M.R., 1988, 'Effect of Vortex Shedding on the Coupled Roll Response of Bodies in Waves,' Joumal of Fluid Mechanics, Vol. 189, pp. 243-261
  8. Jung, K.H., Chang, K.A., and Huang, E.T., 2005, 'Two-dimensional Flow Characteristics of Wave Interactions with a Free-rolling Rectangular Structure,' Ocean Engineering, Vol. 32, pp. 1-20
  9. Lighthill, J., 1986, 'Fundamentals Concern-ing Wave Loading on Offshore Structures,' Journal of Fluid Mechanics, Vol. 173, pp. 667-681
  10. Raffel, M., Willert, C.E. and Kompenhans, J., 1998, Particle Image Velocimetry, Springer-Verlag, Berlin
  11. Roddier, D., Liao, S.-W. and Yeung, R.W., 2000, 'On Freely-floating Cylinders Fitted with Bilge Keels,' 10th International Offshore and Polar Engineering Conference, Seattle, USA, May 28-June 2, pp. 377-384
  12. Salvesen, N., Tuck, E.O. and Faltinsen, O.M., 1970, 'Ship Motions and Sea Loads,' Trans. SNAME, Vol. 78, pp. 250-287
  13. Yeung, R,W., Cermelli C. and Liao, S.-W., 1996, 'Vorticity Fields Due to Rolling Bodies in a Free Surface - Experiment and Theory,' 21st Symposium on Naval Hydrodynamics, Trondheim, Norway, pp. 359-376
  14. Yeung, R.W. and Liao, S.-W. 1999, 'Time-Domain Solution of Freely Floating Cylinders in a Viscous Fluid,' 9th International Offshore and Polar Engineering Conference, Brest, France, May 30-June 4, pp. 454-462
  15. Yeung, R.W., Liao, S.-W. and Roddier, D., 1998, 'Hydrodynamic Coefficients of Rolling Rectangular Cylinders,' 8th International Journal of Offshore and Polar Engineers, Vol. 8, pp. 242-250

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