GEM --一种能量守恒的电磁陀螺流体模型
GEM -- An Energy Conserving Electromagnetic Gyrofluid Model
摘要：
详细研究了回转流体模型中的涨落自由能守恒。极化方程涉及ExB流和涡流能量的组合的潜力和密度和垂直温度。这些决定了在力矩方程中导数下必须出现的组合，使得不仅热自由能，而且其与ExB能量的组合通过平行和垂直压缩效应适当地守恒。由此产生的系统表现出相同的定性能量传递特性作为相应的Braginskii或朗道流体模型。一个明确的结果是，建立在这些方程的数值模型是表现良好的任意大的垂直波数，允许探索两个规模的现象，连接在离子和电子gyroradii的动态。当数值公式是在全球一致的通量管模型，绝热电子的结果是一致的“气旋基本情况”的陀螺模型的结果。
英文摘要：
The details of fluctuation free energy conservation in the gyrofluid model are examined. The polarisation equation relates ExB flow and eddy energy to combinations of the potential and the density and perpendicular temperature. These determine the combinations which must appear under derivatives in the moment equations so that not only thermal free energy but its combination with the ExB energy is properly conserved by parallel and perpendicular compressional effects. The resulting system exhibits the same qualitative energy transfer properties as corresponding Braginskii or Landau fluid models. One clear result is that the numerical model built on these equations is well behaved for arbitrarily large perpendicular wavenumber, allowing exploration of two scale phenomena linking dynamics at the ion and electron gyroradii. When the numerical formulation is done in the globally consistent flux tube model, the results with adiabatic electrons are consistent with the ``Cyclone Base Case'' results of gyrokinetic models.
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