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Active Absorption wave maker System for Irregular waves

海洋工程：英文版 2003年第2期17卷 203-214页

作者：柳淑学王先涛李木国郭美谊 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

The key problem in physical model tests with highly reflective structures is to prevent the multiple reflections between the reflective structures and the wave maker. An active absorption wave maker system is described and the representative frequency method for irregular waves is proposed in this paper. Physical model tests are conducted to verify the effectiveness of the proposed method.

关键词： wave maker active absorption wave reflection

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A Numerical Investigation of Gap and Shape Effects on a 2D Plunger-Type wave maker

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Journal of Marine Science and Application 2020年第1期19卷 101-115页

作者： Amir H.Nikseresht Harry B.Bingham Department of Mechanical Engineering Technical University of DenmarkDK-2800 Kgs LyngbyDenmark Department of Mechanical Engineering Shiraz University of TechnologyShiraz 71555-13876Iran

The installation of plunger-type wave makers in experimental tanks will generally include a gap between the back of the wedge and the wall of the *** this study,we analyze the influence of this gap on the wave making performance of the plunger using two-dimensional(2 D)CFD calculations for a range of nearly linear wave conditions and compare the results with both experimental measurements and linear potential flow *** wedge-shaped profiles,all with the same submerged volume,are ***,the generated waves are compared with the predictions of linear potential flow *** calculations are made using the commercial ANSYS FLUENT finite-volume code with dynamic meshes to solve the Navier-Stokes equations and the volume of fluid scheme to capture the air-water ***,the linear potential flow solution of Wu(J Hydraul Res 26:481-493,1988)is extended to consider an arbitrary profile and serve as a reference *** amplitude ratios of the generated waves predicted by the CFD calculations compare well with the predictions of linear potential flow theory for a simple wedge,indicating that viscous effects do not influence this ratio for small-amplitude motions in 2 *** contrast,significant higher harmonic components are produced by larger amplitude ***,the simple wedge is found to produce the smallest spurious higher harmonic content in the far-field wave.

关键词： wave maker Plunger-type Berkeley wedge Hyperbolic sine profile Gap Dynamic mesh Volume of fluid

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维普期刊数据库

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ANALYTICAL STUDY OF wave MAKING IN A FLUME WITH A PARTIALLY REFLECTING END-WALL

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Journal of Hydrodynamics 2010年第3期22卷 402-409页

作者： ZHOU Bin-zhen NING De-zhi TENG Bin CHEN Li-fen State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic ResearchInstitute Nanjing 210029 China

Based on the eigenfunction expansion technique, the wave generation by a piston wave maker in a wave flume with a partially reflecting end-wall is studied. The corresponding velocity potential and wave elevation in the flume are obtained. The present analytical solution is verified by the numerical results obtained from a time-domain higher-order boundary element method in a closed flume. Numerical experiments are further carried out to study the difference between the partial/full reflection boundary and the transmission boundary and the effects of the reflection coefficient and the motion period of the wave maker on the wave height. Meanwhile, the natural frequency of the wave flume can be obtained from the analytical expression. The resonance occurs when the motion frequency is equal to the natural frequency. Even the partial reflection of the end-wall in the wave flume experiments has a great influence on the wave height, therefore, inaccurate measurements would be resulted in long-time simulations, especially when the wave frequency approaches the wave flume natural frequency. The present study can serve as a guidance for the physical experiment in wave flumes.

关键词： wave flume wave maker partially reflecting end-wall resonance eigenfunction analytical study

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