수직 평판 요소의 수중동요 근사해와 설계 적용
Approximate Solution of Vertical Wave Board Oscillating in Submerged Condition and Its Design Application
2
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
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.
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.
참고문헌 (8)
- Anbarsooz, M., "Fully nonlinear viscous wave generation in numerical wave tanks", Ocean Engineering, 59, pp.73~85 (2013)
- Dean, R.G., "Water Wave Mechanics for Engineers and Scientists" (1984), Prentice-Hall, Inc.
- Hughes, S.A., "Physical Model and Laboratory Techniques in Coastal Engineering" (1993)
- Hyun, J. M., "Theory for hinged wavemakers of finite draft in water of constant depth", Journal of Hydronautics, 10(1), pp.2~7 (1976)
- 권종오, "조파판 수중운동의 근사해석과 조파기 설계에 응용", 대한조선학회 논문집, 54(6), pp.461~469 (2017), 대한조선학회[DOI]
- Maguire, A. E., "Hydrodynamics, control and numerical modelling of absorbing wavemakers", Ph. D., pp.2011
- Tanizawa, K., "The actual sea model basin(in Japanese)", Report of National Maritime Research Institute, 10(4), pp.343~382 (2011)
- Webster, W., "The dispersion of large-amplitude gravity waves in deep water", Eighteenth Symposium on Naval Hydrodynamics, National Academy of sciences, pp.397~416 (1991)