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

Journal Article · · Physical Review E
 [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
+ Show Author Affiliations

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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
AC52-06NA25396; AC05-00OR22725
OSTI ID:
1514956
Alternate ID(s):
OSTI ID: 1414510
Report Number(s):
LA-UR-17-25906
Journal Information:
Physical Review E, Vol. 96, Issue 6; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (2)

Ion friction at small values of the Coulomb logarithm journal May 2019
Ion friction at small values of the Coulomb logarithm text January 2019

Figures / Tables (13)

FIG. 1(p. 6)figure FIG. 1
FIG. 2(p. 6)figure FIG. 2
FIG. 3(p. 9)figure FIG. 3
TABLE I(p. 9)table TABLE I
FIG. 4(p. 11)figure FIG. 4
FIG. 5(p. 12)figure FIG. 5
FIG. 6(p. 13)figure FIG. 6
FIG. 7(p. 14)figure FIG. 7
FIG. 8(p. 14)figure FIG. 8
FIG. 10(p. 15)figure FIG. 10
FIG. 9(p. 15)figure FIG. 9
FIG. 11(p. 16)figure FIG. 11
FIG. 12(p. 16)figure FIG. 12

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
high-energy-density plasmas
inertial confinement fusion
plasma transport
plasma kinetic theory