Viscous dissipation in two-dimensional compression of turbulence
Abstract
Nonradial hydrodynamic flow can be generated or amplified during plasma compression by various mechanisms, including the compression itself. In certain circumstances, the plasma may reach a viscous state; for example, in compression experiments seeking fusion, the fuel plasma may reach a viscous state late in the compression due in part to the rising fuel temperature. Here, we consider viscous dissipation of nonradial flow in the case of initially isotropic, three-dimensional (3D), turbulent flow fields compressed at constant velocity in two dimensions. Prior work in the case of 3D compressions has shown the possibility of effective viscous dissipation of nonradial flow under compression. We show that, theoretically, complete viscous dissipation of the nonradial flow should still occur in the 2D case when the plasma heating is adiabatic and the viscosity has the (strong) Braginskii temperature dependence (μ~T5/2). Futhermore, in the general case, the amount of compression required is very large even for modest initial Reynolds numbers, with the compression reaching an intermediate state dominated by variations only in the noncompressed direction. We show that both the nonlinearity and boundary conditions can play important roles in setting the characteristics and ease of the viscous dissipation.
- Authors:
-
- Princeton Univ., Princeton, NJ (United States). Dept. of Astrophysical Sciences
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1574890
- Alternate Identifier(s):
- OSTI ID: 1547667
- Grant/Contract Number:
- NA0003764; NA0001836; SC0014664
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 8; 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. Viscous dissipation in two-dimensional compression of turbulence. United States: N. p., 2019.
Web. doi:10.1063/1.5111961.
Davidovits, Seth, & Fisch, Nathaniel J. Viscous dissipation in two-dimensional compression of turbulence. United States. https://doi.org/10.1063/1.5111961
Davidovits, Seth, and Fisch, Nathaniel J. Wed .
"Viscous dissipation in two-dimensional compression of turbulence". United States. https://doi.org/10.1063/1.5111961. https://www.osti.gov/servlets/purl/1574890.
@article{osti_1574890,
title = {Viscous dissipation in two-dimensional compression of turbulence},
author = {Davidovits, Seth and Fisch, Nathaniel J.},
abstractNote = {Nonradial hydrodynamic flow can be generated or amplified during plasma compression by various mechanisms, including the compression itself. In certain circumstances, the plasma may reach a viscous state; for example, in compression experiments seeking fusion, the fuel plasma may reach a viscous state late in the compression due in part to the rising fuel temperature. Here, we consider viscous dissipation of nonradial flow in the case of initially isotropic, three-dimensional (3D), turbulent flow fields compressed at constant velocity in two dimensions. Prior work in the case of 3D compressions has shown the possibility of effective viscous dissipation of nonradial flow under compression. We show that, theoretically, complete viscous dissipation of the nonradial flow should still occur in the 2D case when the plasma heating is adiabatic and the viscosity has the (strong) Braginskii temperature dependence (μ~T5/2). Futhermore, in the general case, the amount of compression required is very large even for modest initial Reynolds numbers, with the compression reaching an intermediate state dominated by variations only in the noncompressed direction. We show that both the nonlinearity and boundary conditions can play important roles in setting the characteristics and ease of the viscous dissipation.},
doi = {10.1063/1.5111961},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {Wed Aug 07 00:00:00 EDT 2019},
month = {Wed Aug 07 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: