期刊
PHYSICS OF PLASMAS
卷 15, 期 12, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3046067
关键词
flow simulation; plasma collision processes; plasma simulation; plasma turbulence
资金
- CASE EPSRC
- US DOE
- STFC (UK) [ST/F002505/1]
- Leverhulme Trust (UK) International Network
- EPSRC [EP/G003955/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G003955/1] Funding Source: researchfish
- Science and Technology Facilities Council [PP/C506021/2] Funding Source: researchfish
A new analytically and numerically manageable model collision operator is developed specifically for turbulence simulations. The like-particle collision operator includes both pitch-angle scattering and energy diffusion and satisfies the physical constraints required for collision operators: it conserves particles, momentum, and energy, obeys Boltzmann's H-theorem (collisions cannot decrease entropy), vanishes on a Maxwellian, and efficiently dissipates small-scale structure in the velocity space. The process of transforming this collision operator into the gyroaveraged form for use in gyrokinetic simulations is detailed. The gyroaveraged model operator is shown to have more suitable behavior at small scales in phase space than previously suggested models. Model operators for electron-ion and ion-electron collisions are also presented.
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