Shock Induced Turbulent Mixing

"Shock Induced Turbulent Mixing" -- Akshay Subramaniam

In this work, high fidelity simulations of the Richtmyer-Meshkov instability on an inclined interface between air and SF6 in a shock tube are performed for a Mach 1.5 shock. The simulations attempt to replicate an experiment conducted at the Texas A&M fluid mixing shock tube facility. Simulations of this problem at multiple spatial resolutions have shown that due to early non-linearities in the current configuration, even low order flow statistics are hard to capture at resolutions where the classical RM cases yield good results. Tight coupling between numerics and flow physics and large range of spatial scales make this a challenging problem to simulate numerically. Simulations shown are conducted with an extended version of the MIRANDA solver developed by Cook et. al (2007) which combines high-order compact finite differences with localized non-linear artificial properties for shock and interface capturing. The MIRANDA code has been shown to scale well up to 65; 000 processors by Cook et. al (2005). Some scaling results on Blue Waters will also be shown.