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Electron parallel closures for arbitrary collisionality

Author: Jeong-Young Ji
Requested Type: Poster Only
Submitted: 2014-05-30 12:08:18

Co-authors: E. D. Held

Contact Info:
Utah State University
87 S 1250 E
Logan, UT   84321
United States

Abstract Text:
Electron parallel closures for density, temperature, and flow velocity equations are developed from an analytical solution to a truncated set of linearized moment equations. An important aspect of the moment method is an accurate account of collision effects [J.-Y. Ji and E. D. Held, Phys. Plasmas 15, 102101 (2008)]. The electron closures (heat flow, viscosity, and friction force) are expressed as integrals of thermodynamic drives (temperature gradient, relative flow velocity between electrons and ions, and flow velocity gradient) weighted by kernel functions. Simple fitted kernel functions are obtained for arbitrary collisionality from the 6400 moment solution and asymptotic behavior in the collisionless limits. The integral (nonlocal) parallel closures agree well with existing closures in the collisional and collisionless limits. The fitted kernels can be used conveniently without solving the higher order moment equations in closing electron fluid equations. Aspects of numerical implementation are discussed.

Characterization: 2.0

Comments:
Place with other PSI-Center posters.

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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