布朗动力学模拟的类齿轮预估-校正方法

WAND-PIC: an accelerated three-dimensional quasi-static particle-in-cell code

We introduce a quasi-static particle-in-cell (PIC) code -- WAND-PIC -- which does not suffer from some of the common limitations of many quasi-static PICs, such as the need for a predictor-corrector method in solving electromagnetic fields. We derive the field equations under quasi-static (QS) approximation and find the explicit form of the "time" derivative of the transverse plasma current. After that, equations for the magnetic fields can be solved exactly without using the predictor-corrector method. Algorithm design and code structure are thus greatly simplified. With the help of explicit …

Pegasus：天体物理等离子体动力学的一种新的混合动力学粒子模拟程序

Pegasus: A New Hybrid-Kinetic Particle-in-Cell Code for Astrophysical Plasma Dynamics

我们描述飞马座，一个新的混合动力学粒子在细胞的代码量身定制的天体物理等离子体动力学的研究。该代码将一个节能的粒子积分成一个稳定的，二阶精度，三阶段的预测-预测-校正集成算法。约束输运方法用于对磁场施加无发散约束。包括一个delta-f计划，以促进减少噪音的系统中，只有小偏离的初始分布函数的研究预计。旋转和剪切的影响是通过轨道平流的剪切片形式实现的。这些算法被嵌入到一个架构中，类似于流行的天体物理磁流体动力学代码雅典娜，一个模块化的，有据可查的，易于使用的，并有效地并行化的数千个处理器上使用。我们提出了一系列的测试，在一个，两个和三个空间维度，展示了保真度和多功能性的代码。

A fast bow shock location predictor-estimator from 2D and 3D analytical models: Application to Mars and the MAVEN mission

We present fast algorithms to automatically estimate the statistical position of the bow shock from spacecraft data, using existing analytical two-dimensional (2D) and three-dimensional (3D) models of the shock surface. We derive expressions of the standoff distances in 2D and 3D and of the normal to the bow shock at any given point on it. Two simple bow shock detection algorithms are constructed, one solely based on a geometrical predictor from existing models, the other using this predicted position to further refine it with the help of magnetometer data, an instrument flown on many planetar…