Understanding turbulence in compressing plasma as a quasi-EOS
Abstract
Inspired by experimental Z-pinch results, we investigate plasma turbulence undergoing compression. In addition to Z-pinches, plasma turbulence can be compressed in a range of natural and laboratory settings, including inertial fusion experiments and astrophysical molecular clouds. The plasma viscosity, when modeled as described by Braginskii, depends strongly on both temperature and ionization state, giving it the possibility to have a large range of behavior. Here, we highlight the importance of viscous variation in these settings, as well as various insights that can be gained by considering this variation. Included are a “sudden viscous dissipation” effect that leads to a new concept for inertial fusion or X-ray bursts and a bound on turbulent energy behavior under compression. This bound, which was previously applied in inviscid molecular cloud turbulence, is here shown in an application to turbulence that transitions from inviscid to viscous regimes. In conclusion, the task of understanding turbulence under compression can be cast as the process of seeking a “quasi equation of state” for turbulent energy under compression.
- Publication Date:
- Research Org.:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1527100
- Alternate Identifier(s):
- OSTI ID: 1526788
- Grant/Contract Number:
- NA0003764; NA0001836; SC0014664
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 6; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Davidovits, Seth, and Fisch, Nathaniel J. Understanding turbulence in compressing plasma as a quasi-EOS. United States: N. p., 2019.
Web. doi:10.1063/1.5098790.
Davidovits, Seth, & Fisch, Nathaniel J. Understanding turbulence in compressing plasma as a quasi-EOS. United States. https://doi.org/10.1063/1.5098790
Davidovits, Seth, and Fisch, Nathaniel J. Tue .
"Understanding turbulence in compressing plasma as a quasi-EOS". United States. https://doi.org/10.1063/1.5098790. https://www.osti.gov/servlets/purl/1527100.
@article{osti_1527100,
title = {Understanding turbulence in compressing plasma as a quasi-EOS},
author = {Davidovits, Seth and Fisch, Nathaniel J.},
abstractNote = {Inspired by experimental Z-pinch results, we investigate plasma turbulence undergoing compression. In addition to Z-pinches, plasma turbulence can be compressed in a range of natural and laboratory settings, including inertial fusion experiments and astrophysical molecular clouds. The plasma viscosity, when modeled as described by Braginskii, depends strongly on both temperature and ionization state, giving it the possibility to have a large range of behavior. Here, we highlight the importance of viscous variation in these settings, as well as various insights that can be gained by considering this variation. Included are a “sudden viscous dissipation” effect that leads to a new concept for inertial fusion or X-ray bursts and a bound on turbulent energy behavior under compression. This bound, which was previously applied in inviscid molecular cloud turbulence, is here shown in an application to turbulence that transitions from inviscid to viscous regimes. In conclusion, the task of understanding turbulence under compression can be cast as the process of seeking a “quasi equation of state” for turbulent energy under compression.},
doi = {10.1063/1.5098790},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {Tue Jun 18 00:00:00 EDT 2019},
month = {Tue Jun 18 00:00:00 EDT 2019}
}
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Figures / Tables:
FIG. 1: A comparison of the dissipation based bound (Bound - D) and nonlinear based bound (Bound - NL) with simulation results (solid black line) for the turbulent kinetic energy (TKE) during an isotropic, initially-rapid, compression of a turbulent flowfield in three dimensions. The initial TKE is normalized to 1,more »
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Works referencing / citing this record:
Viscous dissipation in two-dimensional compression of turbulence
journal, August 2019
- Davidovits, Seth; Fisch, Nathaniel J.
- Physics of Plasmas, Vol. 26, Issue 8
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.