An Experimental Study of the Effect of Reshock on the Inclined Interface Richtmyer-Meshkov Instability
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An experimental study of the Richtmyer-Meshkov instability (RMI) is presented here for the twice-shocked, or reshocked, inclined interface perturbation. Experiment work was conducted in the shock tube facility in the Advanced Fluid Mixing Lab at Texas A&M University. Experimental cases were performed at a single Atwood number (0.23), Mach number (1.55) and inclination angle (60°) with a perturbation amplitude-to-wavelength ratio of 0.29. Mie scattering and particle image velocimetry (PIV) data was collected using a planar laser system and was used to compute mixing width, vorticity and circulation. Experimental cases were defined by the time which the interface was allowed to develop before reshock interaction. Cases 1, 2 and 3 were defined for development times of 1.635 ms, 3.5 ms and 5.105 ms respectively. Developmental time series were created using Mie scattering images from multiple experimental runs for each case and mixing width data was derived from the time series images. Interface growth rates post-reshock are computed using mixing width and interface length measurements. PIV data for pre- and post-reshock times were used to create vorticity plots for a qualitative discussion of the effect of reshock on the interface and estimate the circulation deposited on the flow field by reshock. Results indicate that the longer the initial interface is allowed to develop prior to reshock interaction, the greater the circulation post-reshock and change in circulation across the reshock interaction. Turbulent kinetic energy spectra for all cases are computed as well as the turbulent length scales of the flow based on mixing width, circulation and interface length.
Creel, Skylar (2014). An Experimental Study of the Effect of Reshock on the Inclined Interface Richtmyer-Meshkov Instability. Master's thesis, Texas A & M University. Available electronically from