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Experimental observation of gravity–capillary solitary waves generated by a moving air suction

Published online by Cambridge University Press:  27 October 2016

Beomchan Park  and
Yeunwoo Cho
Beomchan Park
Affiliation:
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehakro, Yuseonggu, Daejeon, 34141, Republic of Korea
Yeunwoo Cho*
Affiliation:
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehakro, Yuseonggu, Daejeon, 34141, Republic of Korea
*
†Email address for correspondence: [email protected]
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Abstract

Gravity–capillary solitary waves are generated by a moving ‘air-suction’ forcing instead of a moving ‘air-blowing’ forcing. The air-suction forcing moves horizontally over the surface of deep water with speeds close to the minimum linear phase speed $c_{min}=23~\text{cm}~\text{s}^{-1}$. Three different states are observed according to forcing speeds below $c_{min}$. At relatively low speeds below $c_{min}$, small-amplitude linear circular depressions are observed, and they move steadily ahead of and along with the moving forcing. As the forcing speed increases close to $c_{min}$, however, nonlinear three-dimensional (3-D) gravity–capillary solitary waves are observed, and they move steadily ahead of and along with the moving forcing. Finally, when the forcing speed is very close to $c_{min}$, oblique shedding phenomena of 3-D gravity–capillary solitary waves are observed ahead of the moving forcing. We found that all the linear and nonlinear wave patterns generated by the air-suction forcing correspond to those generated by the air-blowing forcing. The main difference is that 3-D gravity–capillary solitary waves are observed ‘ahead of’ the air-suction forcing whereas the same waves are observed ‘behind’ the air-blowing forcing.

JFM classification

Waves/Free-surface Flows: Solitary waves Waves/Free-surface Flows: Waves/Free-surface Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 808 , 10 December 2016 , pp. 168 - 188
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Copyright
© 2016 Cambridge University Press 

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