### Session NQ: Richtmyer-Meshkov Instability

11:01 AM–1:37 PM, Tuesday, November 22, 2005
Hilton Chicago Room: Stevens 2

Chair: Christopher Tomkins, Los Alamos National Laboratory

Abstract ID: BAPS.2005.DFD.NQ.5

### Abstract: NQ.00005 : Richtmyer-Meshkov Instability of a Membraneless, Sinusoidal Gas Interface

11:53 AM–12:06 PM

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#### Authors:

Results are presented from a series of shock tube experiments studying the Richtmyer-Meshkov instability (RMI) for the case of a 2-D single mode gas interface. The membraneless interface is formed by the head-on flow of nitrogen, seeded with acetone, and sulfur-hexafluoride which creates a stagnation surface. A sinusoidal interface is created by oscillating two rectangular pistons that are initially flush with the shock tube walls. The RMI is studied for varying incident shock strengths (1.3 $\le M \le$ 4) by imaging the interface with planar laser-induced fluorescence, once immediately before shock arrival and at two different post-shock times. The experimental images and the growth rates of non-dimensionalized geometrical features are compared to numerical simulations using the \textit{Raptor} code (LLNL) which takes advantage of the Piecewise Linear Method (PLM) with Adaptive Mesh Refinement (AMR) to solve the Navier-Stokes equations.