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A new model of roll waves: comparison with Brock’s experiments

Published online by Cambridge University Press:  11 April 2012

G. L. Richard  and
S. L. Gavrilyuk
G. L. Richard
Affiliation:
Aix-Marseille University, UMR CNRS 6595, IUSTI, 5 rue E. Fermi, 13453 Marseille CEDEX 13, France
S. L. Gavrilyuk*
Affiliation:
Aix-Marseille University, UMR CNRS 6595, IUSTI, 5 rue E. Fermi, 13453 Marseille CEDEX 13, France
*
†Email address for correspondence: [email protected]
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Abstract

We derive a mathematical model of shear flows of shallow water down an inclined plane. The non-dissipative part of the model is obtained by averaging the incompressible Euler equations over the fluid depth. The averaged equations are simplified in the case of weakly sheared flows. They are reminiscent of the compressible non-isentropic Euler equations where the flow enstrophy plays the role of entropy. Two types of enstrophies are distinguished: a small-scale enstrophy generated near the wall, and a large-scale enstrophy corresponding to the flow in the roller region near the free surface. The dissipation is then added in accordance with basic physical principles. The model is hyperbolic, the corresponding ‘sound velocity’ depends on the flow enstrophies. Periodic stationary solutions to this model describing roll waves were obtained. The solutions are in good agreement with the experimental profiles of roll waves measured in Brock’s experiments. In particular, the height of the vertical front of the waves, the shock thickness and the wave amplitude are well captured by the model.

JFM classification

Waves/Free-surface Flows: Channel flow Geophysical and Geological Flows: Shallow water flows Waves/Free-surface Flows: Shear waves
Type
Papers
Information
Journal of Fluid Mechanics , Volume 698 , 10 May 2012 , pp. 374 - 405
Copyright
Copyright © Cambridge University Press 2012

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