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Article Dans Une Revue Plasma Physics and Controlled Fusion Année : 2014

Hybrid Vlasov-MHD models: Hamiltonian vs. non-Hamiltonian

Résumé

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 Alfvén 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.
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Dates et versions

hal-01022125 , version 1 (10-07-2014)

Identifiants

  • HAL Id : hal-01022125 , version 1

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Cesare Tronci, Emanuele Tassi, Enrico Camporeale, Philip Morrison. Hybrid Vlasov-MHD models: Hamiltonian vs. non-Hamiltonian. Plasma Physics and Controlled Fusion, 2014, 56, pp.095008. ⟨hal-01022125⟩
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