Bulletin of the American Physical Society
49th Annual Meeting of the Division of Plasma Physics
Volume 52, Number 11
Monday–Friday, November 12–16, 2007; Orlando, Florida
Session CP8: Poster Session II: Reconnection and Non-Neutral I; Spheromaks and MCX; MFC Diagnostics; Simulation: Algorithm; Simulation: Kinetic/Edge
Monday, November 12, 2007
Rosen Centre Hotel Room: Grand Ballroom, 2:00pm - 5:00pm
Abstract ID: BAPS.2007.DPP.CP8.118
Abstract: CP8.00118 : A Hybrid Monte Carlo Method for Coulomb Collisions*
Preview Abstract Abstract
(U. Ferrara )
This presentation describes a hybrid computational method for Coulomb collisions in a plasma that combines a Monte Carlo particle simulation and a fluid dynamic solver in a single uniform method throughout phase space. The new method is based on a hybrid representation of the velocity distribution function $f(v)$, as a combination of a Maxwellian equilibrium $M(v)$ and a collection of discrete particles $g(v)$. The Maxwellian $M$ evolves in space and time through fluid-like equations, and the particles in $g$ convect and collide through Nanbu's Monte Carlo particle method (PRE 1997). Interactions between $M$ and $g$ are represented by a thermalization process that removes particles from g and includes them in $M$ and a dethermalization process that samples particles from $M$ and inserts them into $g$. As test cases for the hybrid method, we have used relaxation of an anisotropic Maxwellian and evolution of a bump-on-tail.
*Work performed for USDOE by Univ. California LLNL under contract W-7405-ENG-48 and by UCLA under grant DE-FG02-05ER25710.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.DPP.CP8.118
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