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Experiments on the Richtmyer–Meshkov instability: Small-scale perturbations on a plane interface

Brouillette, M. and Sturtevant, B. (1993) Experiments on the Richtmyer–Meshkov instability: Small-scale perturbations on a plane interface. Physics of Fluids A - Fluid Dynamics, 5 (4). pp. 916-930. ISSN 0899-8213. http://resolver.caltech.edu/CaltechAUTHORS:BROpofa93

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Abstract

This paper reports the results of measurements of the "visual thickness," obtained from flow visualization experiments by the schlieren method, of initially plane interfaces between two gases under impulsive accelerations. It is found that when such interfaces are processed by just one incident shock wave of strength of order Ms=1.5, their thickness increases slowly and they require observation over extended times; their growth rates are found to slow down with time, in agreement with simple theoretical arguments. The observed growth rates of thin interfaces formed by plastic membranes have been found to be substantially smaller than that reported by previous investigators. Also, thick, diffusively smoothed interfaces initially grow much more slowly than the discontinuous ones do. In these experiments, it is found that wall vortices formed by shock wave/boundary-layer interaction at the interface grow much more rapidly than the shock-processed interfaces in the bulk of the fluid. These wall structures can reduce the apparent growth of interfaces by vorticity-induced strain and impair the observation of the relevant interface phenomena.


Item Type:Article
Additional Information:Copyright © 1993 American Institute of Physics. Received 10 September 1991; accepted 1 December 1992. This research was supported by the U.S. Department of Energy, Lawrence Livermore National Laboratory, under project agreement DOE W-7405-ENG-48.
Subject Keywords:SHOCK WAVES; INSTABILITY GROWTH RATES; FLOW VISUALIZATION; INTERFACES; SCHLIEREN METHOD; VORTICES; BOUNDARY LAYERS; TURBULENT FLOW; STRATIFIED FLOW
Record Number:CaltechAUTHORS:BROpofa93
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BROpofa93
Alternative URL:http://dx.doi.org/10.1063/1.858637
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3798
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:12 Jul 2006
Last Modified:26 Dec 2012 08:56

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