Abstract
A numerical study of the evolution of the multimode planar Richtmyer-Meshkov (RM) instability in a light-heavy (Air-SF6, Atwood number A = 0.67) configuration involving a Mach number Ma = 1.5 shock is carried out. Our results demonstrate that the initial material interface morphology controls the evolution RM characteristics, and provide a significant basis to develop metrics for transition to turbulence. Depending on the initial rms slope of the interface, RM evolves into linear or nonlinear regimes, with distinctly different flow features and growth rates, turbulence statistics and material mixing rates. We have called this the bipolar behavior of the RM instability. We demonstrate an important practical consequence of our results: reshock effects on mixing and transition can be emulated at first shock if the initial rms slope is high enough.
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