Time diffusion method for gyrokinetic simulation of electrostatic turbulence with kinetic electrons
Time diffusion method for gyrokinetic simulation of electrostatic turbulence with kinetic electrons
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DOI：
10.1016/j.cpc.2021.108114
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
Pengfei Zhao;L. Ye;N. Xiang
中科院分区：
文献类型：
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作者：
Pengfei Zhao;L. Ye;N. Xiang
A new method based on a time diffusion technique is developed to mitigate the numerical instability induced by the high frequency electrostatic shear Alfvén wave (ω H mode) in the gyrokinetic simulation of electrostatic turbulence. It can preserve fully drift-kinetic electron effects and can be incorporated efficiently with explicit time integration scheme. This method has been implemented in the semi-Lagrangian gyrokinetic code NLT (Lei Ye, et al.(2016)[25]) and applied successfully to linear and nonlinear ITG/TEM turbulence simulation. Numerical results show that this time diffusion method can greatly enlarge time step size and improve numerical stability for electrostatic turbulence simulation in tokamaks.
