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Molecular mixing in Rayleigh–Taylor instability

Published online by Cambridge University Press:  26 April 2006

P. F. Linden,
J. M. Redondo and
D. L. Youngs
P. F. Linden
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, UK
J. M. Redondo
Affiliation:
Departmento Fisica Aplicada, Universitat Politecnica de Catalunya, c/Jordi Girona 31, Barcelona 08034, Spain
D. L. Youngs
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading RG7 4PR, UK
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Abstract

Mixing produced by Rayleigh–Taylor instability at the interface between two layers is the subject of a comparative study between laboratory and numerical experiments. The laboratory experiments consist of a layer of brine initially at rest on top of a layer of fresh water. When a horizontal barrier separating the two layers is removed, the ensuing motion and the mixing that is produced is studied by a number of diagnostic techniques. This configuration is modelled numerically using a three-dimensional code, which solves the Euler equations on a 1803 grid. A comparison of the numerical results and the experimental results is carried out with the aim of making a careful assessment of the ability of the code to reproduce the experiments. In particular, it is found that the motions are quite sensitive to the presence of large scales produced when the barrier is removed, but the amount and form of the mixing is not very sensitive to the initial conditions. The implications of this comparison for improvements in the experimental and numerical techniques are discussed.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 265 , 25 April 1994, pp. 97 - 124
Copyright
© 1994 Cambridge University Press

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