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Richtmyer–Meshkov instability
The Richtmyer–Meshkov instability (RMI) occurs when two fluids of different density are accelerated. Normally this is by the passage of a shock wave. The development of the instability begins with small amplitude perturbations which initially grow linearly with time. This is followed by a nonlinear regime with bubbles appearing in the case of a light fluid penetrating a heavy fluid, and with spikes appearing in the case of a heavy fluid penetrating a light fluid. A chaotic regime eventually is reached and the two fluids mix. This instability can be considered the impulsive-acceleration limit of the Rayleigh–Taylor instability.
== History ==
R. D. Richtmyer provided a theoretical prediction in "Taylor instability in a shock acceleration of compressible fluids",〔''Communications on Pure and Applied Mathematics'' 13, 297-319 (1960).〕 and E. E. Meshkov (Евгений Евграфович Мешков) provided experimental verification 〔"Instability of the Interface of Two Gases Accelerated by a Shock Wave", ''Soviet Fluid Dynamics'' 4,101-104 (1969).〕 Materials in the cores of stars, like Cobalt-56 from Supernova 1987A were observed earlier than expected. This was evidence of mixing due to Richtmyer–Meshkov and Rayleigh–Taylor instabilities.
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