A particle method for the homogeneous Landau equation

Author: 

Carrillo, J
Hu, J
Wang, L
Wu, J

Publication Date: 

1 June 2020

Journal: 

Journal of Computational Physics: X

Last Updated: 

2021-08-23T00:23:13.34+01:00

Volume: 

7

DOI: 

10.1016/j.jcpx.2020.100066

page: 

100066-100066

abstract: 

© 2020 The Authors We propose a novel deterministic particle method to numerically approximate the Landau equation for plasmas. Based on a new variational formulation in terms of gradient flows of the Landau equation, we regularize the collision operator to make sense of the particle solutions. These particle solutions solve a large coupled ODE system that retains all the important properties of the Landau operator, namely the conservation of mass, momentum and energy, and the decay of entropy. We illustrate our new method by showing its performance in several test cases including the physically relevant case of the Coulomb interaction. The comparison to the exact solution and the spectral method is strikingly good maintaining 2nd order accuracy. Moreover, an efficient implementation of the method via the treecode is explored. This gives a proof of concept for the practical use of our method when coupled with the classical PIC method for the Vlasov equation.

Symplectic id: 

1098407

Submitted to ORA: 

Submitted

Publication Type: 

Journal Article