Sherwood 2015

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Hybrid Vlasov-MHD models

Author: Cesare Tronci
Requested Type: Poster Only
Submitted: 2015-01-08 18:14:37

Co-authors: E. Tassi, E. Camporeale, P.J. Morrison

Contact Info:
University of Surrey
Department of Mathematics
Guildford, Surrey   000000
United Kingdom

Abstract Text:
This paper investigates hybrid kinetic-MHD models, where a hot plasma (governed by a kinetic theory) interacts with a fluid bulk (governed by MHD). Different nonlinear coupling schemes are reviewed, including the pressure-coupling scheme (PCS) used in modern hybrid simulations. This latter scheme suffers from being non-Hamiltonian and to not exactly conserve total energy. Upon adopting the Vlasov description for the hot component, the non-Hamiltonian PCS and a Hamiltonian variant are compared. Special emphasis is given to the linear stability of Alfven waves, for which it is shown that a spurious instability appears at high frequency in the non-Hamiltonian version. This instability is removed in the Hamiltonian version.


March 16-18, 2015
The Courant Institute, New York University