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Shock-driven dispersal of a corrugated finite-thickness particle layer

Journal Article · · Physics of Fluids
DOI:https://doi.org/10.1063/5.0097596· OSTI ID:2565063

A research area emerging in the multiphase flow community is the study of shock-driven multiphase instability (SDMI), a gas–particle analog of the traditional fluid-fluid Richtmyer–Meshkov instability (RMI). In this work, we study the interaction of planar air shocks with corrugated glass particle curtains through the use of numerical simulations with an Eulerian–Lagrangian approach. One objective of this study is to compare the simulated particle curtains to a comparable set of shock tube experiments performed to analyze traditional RMI of a gas curtain. The simulations are set to match the experimental shock Mach numbers and perturbation wavelengths (3.6 and 7.2 mm) while also matching the Atwood number of the experiments to the multiphase Atwood number of the simulations. Varying particle diameters are tested in the simulations to explore the impact of particle diameter on the evolution of the particle curtain. This simulation setup allows for a one-to-one comparison between RMI and SDMI under comparable conditions while also allowing for a separate study into the validity of the use of the multiphase Atwood number to compare the single-phase and multiphase instabilities. In particular, we show that the comparison depends on the diameter of the particles (thus, dependent on the Stokes number of the flow). A second objective of this study is to analyze the effect of the initial particle volume fraction on the evolution of the curtain and the behavior of the instability. This is done through analyzing the effect of the multiphase terms of the vorticity evolution equation on the vorticity deposition in SDMI. Also discussed is the effect of the particle diameter on the multiphase generation terms as well as in the baroclinic vorticity generation term in SDMI as the shock passes over the curtain.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Lawrence Livermore National Laboratory (LLNL); Lawrence Livermore National Security, LLC; USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001; AC52-07NA27344; NA0002378
OSTI ID:
2565063
Alternate ID(s):
OSTI ID: 1879141
OSTI ID: 1881827
OSTI ID: 1891217
Report Number(s):
LA-UR-22-23292; LLNL-JRNL-834412; 083301
Journal Information:
Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 8 Vol. 34; ISSN 1070-6631
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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