Nonlinear finite-Larmor-radius effects in reduced fluid models
Nonlinear finite-Larmor-radius effects in reduced fluid models
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DOI：
10.1063/1.2965827
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发表时间：
2007-11
影响因子：
2.2
通讯作者：
A. Brizard;R. Denton;B. Rogers;W. Lotko
中科院分区：
文献类型：
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作者：
A. Brizard;R. Denton;B. Rogers;W. Lotko
与导致非线性回旋动力学Vlasov-Maxwell方程的动力学约化相关的极化磁化效应被示出为将非线性有限Larmor半径（FLR）效应引入先前由拉格朗日变分法导出的一组非线性约化流体方程[A. J. Brizard，Phys. Plasmas 12，092302（2005）]。这些固有的非线性FLR效应，这是与从引导中心相空间动力学的陀螺中心相空间动力学的转换，是不同于标准的FLR修正与从粒子到引导中心相空间动力学的转换。我们还提出了线性色散关系的结果，从非线性模拟代码使用这些简化的流体方程。模拟结果（在两个直偶极几何）表明，方程描述的耦合动力学的阿尔芬声波和总的模拟能量守恒。
The polarization magnetization effects associated with the dynamical reduction leading to the nonlinear gyrokinetic Vlasov–Maxwell equations are shown to introduce nonlinear finite-Larmor-radius (FLR) effects into a set of nonlinear reduced-fluid equations previously derived by the Lagrangian variational method [A. J. Brizard, Phys. Plasmas 12, 092302 (2005)]. These intrinsically nonlinear FLR effects, which are associated with the transformation from guiding-center phase-space dynamics to gyrocenter phase-space dynamics, are different from the standard FLR corrections associated with the transformation from particle to guiding-center phase-space dynamics. We also present the linear dispersion relation results from a nonlinear simulation code using these reduced-fluid equations. The simulation results (in both straight dipole geometries) demonstrate that the equations describe the coupled dynamics of Alfven sound waves and that the total simulation energy is conserved.