Title: Computational study of the shock driven instability of a multiphase particle-gas system

Abstract

This paper considers the interaction of a shock wave with a multiphase particle-gas system which creates an instability somewhat similar to the Richtmyer-Meshkov instability but with a larger parameter space. Because this parameter space is large, we only present an introductory survey of the effects of many of these parameters. We highlight the effects of particle-gas coupling, incident shock strength, particle size, effective system density differences, and multiple particle relaxation time effects. We focus on dilute flows with mass loading up to 40% and do not attempt to cover all parametric combinations. Instead, we vary one parameter at a time leaving additional parametric combinations for future work. In this work, the simulations are run with the Ares code, developed at Lawrence Livermore National Laboratory, which uses a multiphase particulate transport method to model two-way momentum and energy coupling. A brief validation of these models is presented and coupling effects are explored. It is shown that even for small particles, on the order of 1μm, multi-phase coupling effects are important and diminish the circulation deposition on the interface by up to 25%. These coupling effects are shown to create large temperature deviations from the dusty gas approximation, up to 20% greater,more » especially at higher shock strengths. It is also found that for a multiphase instability, the vortex sheet deposited at the interface separates into two sheets. In conclusion, depending on the particle and particle-gas Atwood numbers, the instability may be suppressed or enhanced by the interactions of these two vortex sheets.« less

Authors:

McFarland, Jacob A. ^[1]; Black, Wolfgang J. ^[1]; Dahal, Jeevan ^[1]; Morgan, Brandon E.  ^[2]

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+ Show Author Affiliations

1. Univ. of Missouri, Columbia, MO (United States)
2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:

Mon Feb 08 00:00:00 EST 2016

Research Org.:

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1241979

Alternate Identifier(s):

OSTI ID: 1237382

Report Number(s):

LLNL-JRNL-676616; AIP/123-QED
Journal ID: ISSN 1070-6631

Grant/Contract Number:  

AC52-07NA27344; Contract No.DE-AC52-07NA27344

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Fluids

Additional Journal Information:

Journal Volume: 28; Journal Issue: 2; Journal ID: ISSN 1070-6631

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; Multiphase flow; Richtmyer-Meshkov instability; Fluid Instability