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research-article

Properties of the turbulent mixing layer in a spherical implosion

[+] Author and Article Information
Ismael Boureima

University of North Carolina at Charlotte
idjibril@uncc.edu

Praveen Ramaprabhu

University of North Carolina at Charlotte
pramapra@uncc.edu

Nitesh Attal

Convergent Science, Inc.
nitesh.attal@convergecfd.com

1Corresponding author.

ASME doi:10.1115/1.4038401 History: Received December 15, 2016; Revised May 18, 2017

Abstract

We describe the behavior of a multimode interface that degenerates in to a turbulent mixing layer when subjected to a spherical implosion. Results are presented from 3D numerical simulations performed using the astrophysical FLASH code, while the underlying problem description is adopted from Youngs and Williams (YW). During the implosion, perturbations at the interface are subjected to growth due to the Richtmyer-Meshkov instability, the Rayleigh-Taylor instability, as well as Bell-Plesset effects. We report on several quantities of interest to the turbulence modeling community, including the turbulent kinetic energy, components of the anisotropy tensor, density self-correlation, and atomic mixing among others.

Copyright (c) 2017 by ASME
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