NDLI: On the Aspects of a Convergent Shock Wave Impinging a Perturbed Density Interface

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On the Aspects of a Convergent Shock Wave Impinging a Perturbed Density Interface

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Erik, S. Proano Rollin, Bertrand Seo, Dongeun
Copyright Year	2018
Abstract	The detailed characterization of a fluid flow following a convergent shock wave impinging a perturbed density interface is an extremely complex task as this flow combines geometry effects, compressibility effects and turbulence. Nonetheless, more understanding is necessary to be able to develop models that help accurately predict the flow behavior when occurring in engineering applications. Such an application is Inertial Confinement Fusion (ICF), where turbulent mixing induced by the interaction of the shock wave with the fuel pellet is detrimental to the fusion process. This interaction triggers mixing due to baroclinic vorticity deposition at the density interface in a phenomenon known as the Richtmyer-Meshkov Instability (RM). Next, the Rayleigh-Taylor Instability (RT) is driving the final growth of the mixing layer limited by secondary instabilities such as the Kelvin-Helmholtz Instability (KH). These classical hydrodynamic instabilities (HI) trigger the mixing process that leads ultimately to a highly-mixed fluid layer. For this study, we simulate a cylindrical Sulfur hexafluoride (SF6) target immersed into an air medium. The incident shock wave is regarded as a Chisnell-type converging shock wave impinging into a perturbed cylindrical density discontinuity generated with a wave-like spatial perturbation spectra. Parameters of interest are the growth rate and width of the mixing layer at the density discontinuity. This study aims at describing and quantifying relevant aspects of these flows coupling mixing layer growth with perturbation modes.
File Format	PDF
ISBN	9780791852101
DOI	10.1115/IMECE2018-88098
Volume Number	Volume 7: Fluids Engineering
Conference Proceedings	ASME 2018 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2018-11-09
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Turbulence Pellet fusion Compressibility Fluid dynamics Hydrodynamic stability Fuels Density Flow (dynamics) Waves Engineering systems and industry applications Geometry Shock waves Fluids Spectra (spectroscopy) Rayleigh-taylor instability Vorticity Sulfur
Content Type	Text
Resource Type	Article

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