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Wave patterns generated by an axisymmetric obstacle in a two-layer flow

Lacaze, Laurent and Paci, Alexandre and Cid, Emmanuel and Cazin, Sébastien and Eiff, Olivier and Esler, J. Gavin and Johnson, Edward R. Wave patterns generated by an axisymmetric obstacle in a two-layer flow. (2013) Experiments in Fluids, 54 (1618). 1-10. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-013-1618-z

Abstract

Gravity waves generated by a moving obstacle in a two-layer stratified fluid are investigated. The experimental configuration is three-dimensional with an axisymmetric obstacle which is towed in one of the two layers. The experimental method used in the present study is based on a stereoscopic technique allowing the 3D reconstruction of the interface between the two layers. Investigation into the wave pattern as a function of the Froude number, Fr, based on the relative density of the fluid layers and the velocity of the towed obstacle is presented. Specific attention is paid to the transcritical regime for which Fr is close to one. Potential energy trapped in the wave field patterns is also extracted from the experimental results and is analyzed as a function of both the Froude number, Fr, and the transcritical similarity parameter Gamma. In particular, a remarkable increase in the potential energy around Fr = 1 is observed and a scaling allowing to assemble data resulting from different experimental parameters is proposed.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The definitive version is available at http://link.springer.com/article/10.1007%2Fs00348-013-1618-z
HAL Id:hal-00958121
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > University College of London - UCL (UNITED KINGDOM)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Météo France (FRANCE)
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Deposited On:11 Mar 2014 15:59

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