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New wave generation

Published online by Cambridge University Press:  19 July 2010

MATTHIEU J. MERCIER ,
DENIS MARTINAND ,
MANIKANDAN MATHUR ,
LOUIS GOSTIAUX ,
THOMAS PEACOCK  and
THIERRY DAUXOIS
MATTHIEU J. MERCIER*
Affiliation:
Laboratoire de Physique de l'École Normale Supérieure de Lyon, CNRS–Université de Lyon, Lyon 69364, France
DENIS MARTINAND
Affiliation:
Laboratoire M2P2, UMR 6181 CNRS–Universités Aix-Marseille, Marseille 13451, France
MANIKANDAN MATHUR
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 01239, USA
LOUIS GOSTIAUX
Affiliation:
Laboratoire des Écoulements Géophysiques et Industriels (LEGI), CNRS, Grenoble 38000, France
THOMAS PEACOCK
Affiliation:
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 01239, USA
THIERRY DAUXOIS
Affiliation:
Laboratoire de Physique de l'École Normale Supérieure de Lyon, CNRS–Université de Lyon, Lyon 69364, France
*
†Email address for correspondence: [email protected]
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Abstract

We present the results of a combined experimental and numerical study of the generation of internal waves using the novel internal wave generator design of Gostiaux et al. (Exp. Fluids, vol. 42, 2007, pp. 123–130). This mechanism, which involves a tunable source composed of oscillating plates, has so far been used for a few fundamental studies of internal waves, but its full potential is yet to be realized. Our study reveals that this approach is capable of producing a wide variety of two-dimensional wave fields, including plane waves, wave beams and discrete vertical modes in finite-depth stratifications. The effects of discretization by a finite number of plates, forcing amplitude and angle of propagation are investigated, and it is found that the method is remarkably efficient at generating a complete wave field despite forcing only one velocity component in a controllable manner. We furthermore find that the nature of the radiated wave field is well predicted using Fourier transforms of the spatial structure of the wave generator.

JFM classification

Geophysical and Geological Flows: Internal waves Geophysical and Geological Flows: Stratified flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 657 , 25 August 2010 , pp. 308 - 334
Copyright
Copyright © Cambridge University Press 2010

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References

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