TITLE

Low-noise particle algorithms for extended magnetohydrodynamic closure

AUTHOR(S)
Barnes, D. C.; Cheng, J.; Parker, S. E.
PUB. DATE
May 2008
SOURCE
Physics of Plasmas;May2008, Vol. 15 Issue 5, p055702
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Two new low-noise particle closure methods are developed and tested. Closure of a small set of moment equations is accomplished with first or second order moments computed from a delta-f particle in cell (δf PIC) distribution. Conservation laws are developed and in one case apply to the discrete system, showing that squared weights are part of the system energy and therefore bounded for all time. Implicit time differencing and orbit averaging techniques are developed and implemented. Low-order moment constraints are satisfied exactly by a new particle representation. Numerical tests for one dimension, k⊥=0, and two dimension, k∥=0 show the successful application of both methods to damped waves and of the second order closure method to unstable gravitational modes. The methods described here are a natural and efficient way to close extended magnetohydrodynamic (MHD) equations to obtain a full kinetic description.
ACCESSION #
32509554

 

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