Abstract Details
Abstracts
Author: Brett L. Adair
Requested Type: Poster
Submitted: 2019-02-22 13:14:37
Co-authors: E. D. Held, J. A. Spencer
Contact Info:
Utah State University
4415 Old Main Hill
Logan, UT 84322
United States
Abstract Text:
Implementing kinetic closures for the collisional friction and energy exchange in hybrid fluid/kinetic codes requires
accurate evaluation of the electron-ion collision operator and its moments. One particular difficulty arises in the
electron Maxwellian/ion background response, which is large at low electron speeds, v ~ v_Ti. In this work, we
capture this response using a distribution function expanded in two sets of non-classical polynomials that are orthogonal
with respect to desired weight functions at low and high electron velocity. Associated quadrature (collocation) points
are generated using a Gauss-Radau approach with pre-assigned nodes at the boundary of the two domains. Necessary
derivatives at the boundary are computed using higher-order finite-difference and Chebyshev polynomial techniques.
In order to highlight the efficiency of this approach, results are presented for the Spitzer conduction and thermalization
problems.
*Work supported by DOE under grant nos. DE-FC02-08ER54973, DE-FG02-04ER54746, and DE-SC0018146.
Comments:
