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Title: Interfacial mixing in high-energy-density matter with a multiphysics kinetic model

Abstract

We have extended here a recently developed multispecies, multitemperature Bhatnagar-Gross-Krook model [Haack et al., J. Stat. Phys. 168, 822 (2017)], to include multiphysics capabilities that enable modeling of a wider range of physical conditions. In terms of geometry, we have extended from the spatially homogeneous setting to one spatial dimension. In terms of the physics, we have included an atomic ionization model, accurate collision physics across coupling regimes, self-consistent electric fields, and degeneracy in the electronic screening. We apply the model to a warm dense matter scenario in which the ablator-fuel interface of an inertial confinement fusion target is heated, but for larger length and time scales and for much higher temperatures than can be simulated using molecular dynamics. Relative to molecular dynamics, the kinetic model greatly extends the temperature regime and the spatiotemporal scales over which we are able to model. In our numerical results we observe hydrogen from the ablator material jetting into the fuel during the early stages of the implosion and compare the relative size of various diffusion components (Fickean diffusion, electrodiffusion, and barodiffusion) that drive this process. We also examine kinetic effects, such as anisotropic distributions and velocity separation, in order to determine when thismore » problem can be described with a hydrodynamic model.« less

Authors:
 [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational and Applied Mathematics Group; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mathematics
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Computational Mathematics, Science and Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1514956
Alternate Identifier(s):
OSTI ID: 1414510
Report Number(s):
LA-UR-17-25906
Journal ID: ISSN 2470-0045
Grant/Contract Number:  
AC52-06NA25396; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high-energy-density plasmas; inertial confinement fusion; plasma transport; plasma kinetic theory

Citation Formats

Haack, Jeffrey R., Hauck, Cory D., and Murillo, Michael S. Interfacial mixing in high-energy-density matter with a multiphysics kinetic model. United States: N. p., 2017. Web. doi:10.1103/PhysRevE.96.063310.
Haack, Jeffrey R., Hauck, Cory D., & Murillo, Michael S. Interfacial mixing in high-energy-density matter with a multiphysics kinetic model. United States. doi:10.1103/PhysRevE.96.063310.
Haack, Jeffrey R., Hauck, Cory D., and Murillo, Michael S. Thu . "Interfacial mixing in high-energy-density matter with a multiphysics kinetic model". United States. doi:10.1103/PhysRevE.96.063310. https://www.osti.gov/servlets/purl/1514956.
@article{osti_1514956,
title = {Interfacial mixing in high-energy-density matter with a multiphysics kinetic model},
author = {Haack, Jeffrey R. and Hauck, Cory D. and Murillo, Michael S.},
abstractNote = {We have extended here a recently developed multispecies, multitemperature Bhatnagar-Gross-Krook model [Haack et al., J. Stat. Phys. 168, 822 (2017)], to include multiphysics capabilities that enable modeling of a wider range of physical conditions. In terms of geometry, we have extended from the spatially homogeneous setting to one spatial dimension. In terms of the physics, we have included an atomic ionization model, accurate collision physics across coupling regimes, self-consistent electric fields, and degeneracy in the electronic screening. We apply the model to a warm dense matter scenario in which the ablator-fuel interface of an inertial confinement fusion target is heated, but for larger length and time scales and for much higher temperatures than can be simulated using molecular dynamics. Relative to molecular dynamics, the kinetic model greatly extends the temperature regime and the spatiotemporal scales over which we are able to model. In our numerical results we observe hydrogen from the ablator material jetting into the fuel during the early stages of the implosion and compare the relative size of various diffusion components (Fickean diffusion, electrodiffusion, and barodiffusion) that drive this process. We also examine kinetic effects, such as anisotropic distributions and velocity separation, in order to determine when this problem can be described with a hydrodynamic model.},
doi = {10.1103/PhysRevE.96.063310},
journal = {Physical Review E},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

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