• Journal of Korean Society of Coastal and Ocean Engineers
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• v.30 no.6
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• pp.337-342
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• 2018

Wave flume that enables generating water waves is a core research facility for physical experiment related to coastal engineering works. Recently, a new wave flume of 50 m length was constructed in Korea. The wave flume has a sloped section on its bottom. A novel wave generating system incorporating most-updated wave maker theory was introduced to the flume. In addition, water circulating system for adjusting water level was installed beneath the flume. These technical features and detailed specifications of the wave flume are described in this paper.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.34 no.4
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• pp.93-99
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• 2022

Analytical solutions for regular waves generated by bottom wave makers in a 3-dimensional wave basin were derived in this study. Bottom wave makers which have triangular, rectangular and combination of two shapes were adopted. The 3-dimensional velocity potential was derived based on the linear wave theory with the bottom moving boundary condition, kinematic and dynamic free surface boundary conditions in a wave basin. Then, analytical solutions of 3-dimensional particle velocities and free surface displacement were derived from the velocity potential. The solutions showed physically valid results for regular waves generated by bottom wave makers in a wave basin. The analytical solution for obliquely propagating wave generation from bottom wave maker which works like a snake was also derived. Numerical results of the solution agree well with theoretically predicted results.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.3B
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• pp.305-308
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• 2011

In this study, generation methods of 3-D multi-directional random wave are examined using the fully non-linear numerical model with non-reflected wave generation system (LES-WASS-3D). Directional distribution functions obtained by EMLM method are compared for multidirectional random waves generated by various generation methods. As a results, it is revealed that multi-directional wave field can be simulated using LES-WASS-3D.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.37 no.3
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• pp.293-300
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• 2013

This study used a water tank and wave maker to generate conditions similar to the real ocean environment. Given that the waves were properly generated in the water tank, a precise analysis indicated the quantitative value of the wave force acting on a body. A high-speed camera and wave-level gauge were used to measure the temporal wave motion and period. A series of artificial water waves were successfully generated using three different wave periods and amplitudes. Each of the waves captured by a high-speed camera was sinusoidal and did not maintain its shape properly without a wave absorber, but it was substantially improved and well shaped when the wave absorber was installed.

• Journal of the Society of Naval Architects of Korea
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• v.38 no.2
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• pp.1-9
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• 2001

Based on the linear potential theory with the side wall reflection. the directional spectrum waves are numerically simulated by a source distribution method and these together with long-crested irregular waves are also generated at the towing tank of Pusan National University by considering the transfer function of the wave maker obtained from the regular waves. In the numerical simulation, the characteristics of the directional spreading function are investigated by changing the breadth of the wave-maker unit. the width of the towing tank and the wave period. In the experimental generation, the statistical properties and the power spectrums of the long-crested irregular and directional waves are compared along the towing tank length. The directional spreading functions are also investigated at various positions in the tank.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1993.07a
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• pp.51-54
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• 1993

수조안 주 실험구간에서의 유황이 주로 파랑에 의해서 영향을 받는 경우에는 실험결과의 정확도는 바로 사용된 조파기의 성능에 의해서 좌우된다. 컴퓨터를 이용한 조파기 제어시스템을 구축하기 위해서는 특정 조파판 운동에 대한 조파판에서의 수면변화 양상을 정확히 예측할 필요가 있다. 본 연구에서는 복소수 해석을 통하여 조파판 전달함수를 재구성하였으며 시간영역에서 전달함수를 개별적으로 구현할 수 있는 수치 필터를 제시한다. (중략)

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1992.08a
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• pp.114-117
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• 1992

2차원 수조에서 조파기를 정현파형으로 가동시키면 조파기에서 멀리 떨어진 점에서는 초기의 천이과정을 거쳐 상당한 시간이 경과한 다음 파고와 주기가 일정한 정현파가 전파되어 나간다. 초기의 천이과정에는 비교적 파장이 긴 파성분이 전파하며 감쇄하는데, 이 파성분은 정상파형과 다른 특성을 보인다.(중략)

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1991.07a
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• pp.69-72
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• 1991

2차원 수조에서 조파기를 정현파형으로 가동시키면, 조파기에서 멀리 떨어진 점에서는 초기의 천이과정을 거쳐 파고와 주기가 일정한 정면파가 전파되어 나간다. 초기의 천이과정에서는 비교적 파장이 긴 파성분이 전파하며 감쇄하는데, 이 파성분은 정상파형과 다른 특성을 보인다.(중략)

• Journal of Navigation and Port Research
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• v.46 no.6
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• pp.471-482
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• 2022

This study aims to investigate the characteristics of wave generation in a deep ocean engineering basin and to develop a meta-model of the transfer function of the wavemaker that reflects the geometric characteristics of the deep ocean engineering basin. To this end, the two-dimensional frequency domain boundary element method was applied to achieve an efficient analysis that reflects the geometric characteristics of the deep ocean engineering basin. The developed numerical method was validated through comparison with the analytical solution. Numerical analyses were conducted for the boundary value problem of the wavemaker according to various periods and the positions of the movable bottom. The numerical results were used to investigate the effect of the geometric characteristics of the deep ocean engineering basin on the transfer function of the wavemaker, and the effect of depth on wave generation was checked by changing the position of the movable bottom. To efficiently utilize the various results of the boundary element method, a meta-model, an approximate model of the transfer function of the wave maker, was developed using a thin plate spline interpolation model. The validity of the developed meta-model was confirmed through a comparison of the results of the model tests.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1995.10a
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• pp.85-90
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• 1995

수조에서 조파기로 규칙파와 불규픽파를 발생하는 실험은 오래전부터 수행되었고, 최근에는 이를 수치계산으로 검증하려는 노력이 이루어지고 있다. 본 논문에서는 2차원 수조에서 조파판의 작동을 적절히 조절하여 임의의 지점에 plunger 형 쇄파를 발생시키고, 수치계산으로 이를 확인한 내용을 담았다. 쇄파를 만드는 연구는 Chan(1988)이 조화함수를 합성시키는 기법으로 실험을 수행한 바가 있고, Dommermuth 등(1988)이 이를 수치적으로 검증하였다. (중략)