Effect of Shock Mach Number on Richtmyer-Meshkov Instability in Spherical Geometry
Lombardini et al.  have recently carried out Richtmyer-Meshkov instability (RMI) simulations in cylindrical geometry. RMI for a spherical axisymmetric flow was investigated by Dutta et al. .We consider amore general initial interface perturbation, with a spherical egg-carton profile similar to the one used in planar RMI simulations [3, 4]. An interesting feature of this profile is that the perturbationwavelength is nearly constant over the spherical shell spanned by the material interface. The fluids considered in this study are air outside and SF6 inside. The shock is launched from the air (lighter) side of the interface. As the flow evolves, a series of reflected and transmitted shocks are generated,which via baroclinic deposition of vorticity and its subsequent transport serve to mix the two fluids in a turbulent mixing zone.
KeywordsTurbulent Kinetic Energy Incident Shock Shock Speed Shock Mach Number Atwood Number
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