Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

Approximate Solution of Vertical Wave Board Oscillating in Submerged Condition and Its Design Application

수직 평판 요소의 수중동요 근사해와 설계 적용

  • Oh, Jungkeun (Dept. of Naval Architecture and Ocean Engineering, Kunsan National University) ;
  • Kim, Ju-Yeol (Dept. of Naval Architecture and Ocean Engineering, Kunsan National University) ;
  • Kim, Hyochul (Dept. of Naval Architecture and Ocean Engineering, Seoul National University.Institute of Engineering Research) ;
  • Kwon, Jongho (Dept. of Naval Architecture and Ocean Engineering, Chungmam National University) ;
  • Lew, Jae-Moon (Dept. of Naval Architecture and Ocean Engineering, Chungmam National University)
  • 오정근 (군산대학교 조선해양공학과) ;
  • 김주열 (군산대학교 조선해양공학과) ;
  • 김효철 (서울대학교 조선해양공학과.서울대학교 공학연구원) ;
  • 권종오 (충남대학교 선박해양공학과) ;
  • 류재문 (충남대학교 선박해양공학과)
  • Received : 2018.06.10
  • Accepted : 2018.09.29
  • Published : 2018.12.20
Download PDF
⟨ Previous Next ⟩

Abstract

The segment of the piston type wave board has been expressed as a submerged vertical line segment in the two dimensional wave flume. Either end of vertical line segment representing wave board could be located in fluid domain from free surface to the bottom of the flume. Naturally the segment could be extended from the bottom to the free surface of the flume. It is assumed that the piston motion of the wave board could be defined by the sinusoidal oscillation in horizontal direction. Simplified analytic solution of the submerged segment of wave board has been derived through the first order perturbation method in water of finite depth. The analytic solution has been utilized in expressing the wave generated by the piston type wave board installed on the upper or lower half of the flume. The wave form derived by the analytic solution have been compared with the wave profile obtained through the CFD calculation for the either of the above cases. It is appeared that the wave length and the wave height are coincided each other between analytic solution and CFD calculation. However the wave form obtained by CFD calculations are more closer to real wave form than those from analytic calculation. It is appeared that the linear solutions could be not only superposed by segment but also integrated by finite elements without limitation. Finally it is proven that the wave generated by the oscillation of flap type wave board could be derived by integrating the wave generated by the sinusoidal motion of the finite segment of the piston type wave board.

Keywords

References

  1. Anbarsooz, M., Passandideh-Fard, M. and Moghiman, P.M, 2013. Fully nonlinear viscous wave generation in numerical wave tanks. Ocean Engineering, Vol 59, pp. 73-85. https://doi.org/10.1016/j.oceaneng.2012.11.011
  2. Dean, R.G. & Dalrymple, R.A., 1984. Water Wave Mechanics for Engineers and Scientists, Prentice-Hall, Inc., Englewood Cliffs, New Jersey.
  3. Hughes, S.A., 1993, Physical Model and Laboratory Techniques in Coastal Engineering, USA.
  4. Hyun, J.M., 1976, Theory for hinged wavemakers of finite draft in water of constant depth. Journal of Hydronautics, 10(1), pp 2-7. https://doi.org/10.2514/3.63046
  5. Kwon, J.O., Kim, H., Lew, J.M. & Oh, J.K., 2017. Simplified analytic solution of submerged wave board motion and its application on the design of wave generator. Journal of the Society of Naval Architects of Korea, 54(6), pp.461-469. https://doi.org/10.3744/SNAK.2017.54.6.461
  6. Maguire, A.E., 2011. Hydrodynamics, control and numerical modelling of absorbing wavemakers, Ph. D. Dissertation, The University of Edinburgh.
  7. Tanizawa, K., Ueno, M., Taguchi, H., Fujiwara, T., Miyazaki, H., Sawada, H., & Tsukada, Y., 2011, The actual sea model basin(in Japanese). Report of National Maritime Research Institute, 10(4), pp. 343-382.
  8. Webster, W. & Kim, D.Y., 1991. The dispersion of large-amplitude gravity waves in deep water. Eighteenth Symposium on Naval Hydrodynamics, National Academy of sciences, Washington DC, pp. 397-416.