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Symmetry boundary conditions

机译:对称边界条件

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摘要

A simple approach to energy conserving boundary conditions using exact symmetries is described which is especially useful for numerical simulations using the finite difference method. Each field in the simulation is normally either symmetric (even) or antisymmetric (odd) with respect to the simulation boundary. Another possible boundary condition is an antisymmetric perturbation about a nonzero value. One of the most powerful aspects of this approach is that it can be easily implemented in curvilinear coordinates by making the scale factors of the coordinate transformation symmetric about the boundaries. The method is demonstrated for magnetohydrodynamics (MHD), reduced MHD, and a hybrid code with particle ions and fluid electrons. These boundary conditions yield exact energy conservation in the limit of infinite time and space resolution. Also discussed is the interpretation that the particle charge reverses sign at a conducting boundary with boundary normal perpendicular to the background magnetic field.
机译:描述了一种使用精确对称性来保存边界条件的简单方法,该方法对于使用有限差分法的数值模拟特别有用。模拟中的每个场通常相对于模拟边界是对称的(偶数)或反对称的(奇数)。另一个可能的边界条件是关于非零值的反对称摄动。该方法最强大的方面之一是,通过使坐标变换的比例因子关于边界对称,可以轻松地在曲线坐标中实现该方法。该方法可用于磁流体动力学(MHD),还原MHD以及具有粒子离子和流体电子的混合代码。这些边界条件在无限的时间和空间分辨率的限制内产生了精确的能量守恒。还讨论了以下解释:粒子电荷在导电边界处反转符号,该边界处的法线垂直于背景磁场。

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