论文标题
冥王星代码中相对论粒子动力学的指导中心实施
A guiding center implementation for relativistic particle dynamics in the PLUTO code
论文作者
论文摘要
我们提出了指导中心近似的数值实现，以描述用于天体物理等离子体动力学的冥王星代码中带电测试颗粒的相对主义运动。引导中心近似（GCA）通过遵循粒子运动中心而不是其完整的轨迹来消除由于磁场线周围粒子循环而导致的时间步长约束。如果电磁场与颗粒回旋半径和周期相比，电磁场变化较慢，则可以将回转从引导中心运动分离。我们的实现采用了可变的阶梯尺寸线性多步法方法，与传统的一步runge kutta方案相比，效率更高。为了评估我们实施的有效性，提供了许多数值基准。
We present a numerical implementation of the guiding center approximation to describe the relativistic motion of charged test particles in the PLUTO code for astrophysical plasma dynamics. The guiding center approximation (GCA) removes the time step constraint due to particle gyration around magnetic field lines by following the particle center of motion rather than its full trajectory. The gyration can be detached from the guiding center motion if electromagnetic fields vary sufficiently slow compared to the particle gyration radius and period. Our implementation employs a variable step-size linear multistep method, more efficient when compared to traditional one-step Runge Kutta schemes. A number of numerical benchmarks is presented in order to assess the validity of our implementation.
