Richtmyer-Meshkov Instability (RMI)


The Richtmyer-Meshkov Instability (RMI) is of importance in experimental, theoretical and computational research because of its relevance to inertial confinement fusion (ICF) and astrophysical phenomena. The RMI occurs when an incident shock crosses a corrugated interface between two fluids of different densities. Richtmyer originally developed the linear theory followed by experimental confirmation by Meshkov.
Samtaney showed by numerical simulations that the RMI could be suppressed in the presence of a magnetic field. This was further reconfirmed by analytical incompressible magnetohydrodynamics (MHD) theory of an impulsively accelerated interface developed by Wheatley et al.

 For ICF applications, it is of interest to study RMI in converging (cylindrical or spherical) geometries. In our group, we study the linear stability analysis of an interface accelerated by a Chisnell-type shock in cylindrical converging geometry. Our collaborators at University of Queensland and Caltech are examining the nonlinear evolution in converging geometry using an unsplit MHD code developed by Samtaney.