Observation of the Development of Secondary Features in a Richtmyer–Meshkov Instability Driven Flow

Author:

Bernard Tennille1,Randall Truman C.2,Vorobieff Peter2,Corbin Clint1,Wayne Patrick J.1,Kuehner Garrett1,Anderson Michael3,Kumar Sanjay4

Affiliation:

1. Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87131 e-mail:

2. Mem. ASME Professor Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87131 e-mail:

3. Illinois Rocstar, LLC, Champaign, IL 61826 e-mail:

4. Associate Professor Department of Mechanical Engineering, University of Texas, Brownsville, TX 78520 e-mail:

Abstract

Richtmyer–Meshkov instability (RMI) has long been the subject of interest for analytical, numerical, and experimental studies. In comparing results of experiment with numerics, it is important to understand the limitations of experimental techniques inherent in the chosen method(s) of data acquisition. We discuss results of an experiment where a laminar, gravity-driven column of heavy gas is injected into surrounding light gas and accelerated by a planar shock. A popular and well-studied method of flow visualization (using glycol droplet tracers) does not produce a flow pattern that matches the numerical model of the same conditions, while revealing the primary feature of the flow developing after shock acceleration: the pair of counter-rotating vortex columns. However, visualization using fluorescent gaseous tracer confirms the presence of features suggested by the numerics; in particular, a central spike formed due to shock focusing in the heavy-gas column. Moreover, the streamwise growth rate of the spike appears to exhibit the same scaling with Mach number as that of the counter-rotating vortex pair (CRVP).

Publisher

ASME International

Subject

Mechanical Engineering

Reference26 articles.

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3. Investigation of the Character of the Equilibrium of an Incompressible Heavy Fluid of Variable Density;Proc. London Math. Soc.,1883

4. The Instability of Liquid Surfaces When Accelerated in a Direction Perpendicular to their Planes;Proc. R. Soc. London, Ser. A,1950

5. The Instability of Liquid Surfaces When Accelerated in a Direction Perpendicular to their Planes. Part II;Proc. R. Soc. London, Ser. A,1950

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