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Article Dans Une Revue European Journal of Mechanics - B/Fluids Année : 2015

An experimental study of steep solitary wave reflection at a vertical wall

Yunyan Chen
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C. Kharif
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J. H. Yang
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H. C. Hsu
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Julien Touboul
J. Chambarel
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Résumé

Until now very few experimental investigations have been conducted to study the reflection of steep solitary waves at a vertical wall whereas many theoretical analysis and numerical simulations were developed in the past. The use of experimental techniques to capture the waveform and associate phenomena during the short-time head-on collision of two solitary waves (or the reflection of a solitary wave by a vertical wall) is not an easy task. Solitary waves with amplitude a/h ≤ 0.556 are experimentally generated by a piston type wavemaker. We have used a high speed camera and our experimental results were compared with previous studies, including both theoretical investigations and numerical simulations. We found that previous theoretical results underestimate wave run-up characteristics (maximal run-up amplitude, attachment and detachment times, wall residence time), except the third-order result of Su & Mirie [1] who calculated maximal run-up which is in good agreement with experiments. Within the range of solitary wave amplitude considered experimentally, present measurements are in excellent agreement with numerical results of Cooker et al [2] and Chambarel et al [3]. Furthermore, for very steep solitary waves we found numerically the occurrence of a Rayleigh-Taylor instability on the top of the jet due the collision. A theoretical explanation of the existence of this instability is given.
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Dates et versions

hal-01203293 , version 1 (22-09-2015)

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Yunyan Chen, C. Kharif, J. H. Yang, H. C. Hsu, Julien Touboul, et al.. An experimental study of steep solitary wave reflection at a vertical wall. European Journal of Mechanics - B/Fluids, 2015, 49, pp.20-28. ⟨10.1016/j.euromechflu.2014.07.003⟩. ⟨hal-01203293⟩
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