Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes
Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes
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DOI：
10.1063/1.870934
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发表时间：
1994-07
影响因子：
2.2
通讯作者：
R. Waltz;G. Kerbel;J. Milovich
中科院分区：
文献类型：
--
作者：
R. Waltz;G. Kerbel;J. Milovich
Hammett和Perkins的方法[Phys. Rev. Lett. 64，3019（1990）]对模型朗道阻尼的修正最近被Waltz，Dominguez和Hammett应用于具有曲率漂移的陀螺动力学方程的力矩[Phys. Fluids B 4，3138（1992）]。通过对与扰动麦克斯韦方程的偏差进行建模，以拟合所有动力学参数值下的动力学响应函数：k vth/ω，B=（k ρ）2/2和ωD/ω，根据较低的力矩（密度、平行速度以及平行和垂直压力）截断较高的力矩。在这里，所得到的陀螺朗道流体方程被应用于模拟离子温度梯度（ITG）模式湍流在环形几何形状使用一种新的三维（3-D）非线性气球模式表示。该表示是场线的傅立叶变换，其遵循具有环形角和极向角的周期性的基（ky '，kx'，z '）。特别强调的作用，非线性产生的n=0（ky' = 0，kx'= 0）的“径向模式”在s…
The method of Hammett and Perkins [Phys. Rev. Lett. 64, 3019 (1990)] to model Landau damping has been recently applied to the moments of the gyrokinetic equation with curvature drift by Waltz, Dominguez, and Hammett [Phys. Fluids B 4, 3138 (1992)]. The higher moments are truncated in terms of the lower moments (density, parallel velocity, and parallel and perpendicular pressure) by modeling the deviation from a perturbed Maxwellian to fit the kinetic response function at all values of the kinetic parameters: k∥vth/ω, b=(k⊥ρ)2/2, and ωD/ω. Here the resulting gyro‐Landau fluid equations are applied to the simulation of ion temperature gradient (ITG) mode turbulence in toroidal geometry using a novel three‐dimensional (3‐D) nonlinear ballooning mode representation. The representation is a Fourier transform of a field line following basis (ky’,kx’,z’) with periodicity in toroidal and poloidal angles. Particular emphasis is given to the role of nonlinearly generated n=0 (ky’ = 0, kx’ ≠ 0) ‘‘radial modes’’ in s...