تقرير
The Magnetohydrodynamic-Particle-In-Cell Module in Athena++: Implementation and Code Tests
| العنوان: | The Magnetohydrodynamic-Particle-In-Cell Module in Athena++: Implementation and Code Tests |
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| المؤلفون: | Sun, Xiaochen, Bai, Xue-Ning |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Plasma Physics |
| الوصف: | We present a new magnetohydrodynamic-particle-in-cell (MHD-PIC) code integrated into the Athena++ framework. It treats energetic particles as in conventional PIC codes while the rest of thermal plasmas are treated as background fluid described by MHD, thus primarily targeting at multi-scale astrophysical problems involving the kinetic physics of the cosmic-rays (CRs). The code is optimized toward efficient vectorization in interpolation and particle deposits, with excellent parallel scaling. The code is also compatible with static/adaptive mesh refinement, with dynamic load balancing to further enhance multi-scale simulations. In addition, we have implemented a compressing/expanding box framework which allows adiabatic driving of CR pressure anisotropy, as well as the $\delta f$ method that can dramatically reduce Poisson noise in problems where distribution function $f$ is only expected to slightly deviate from the background. The code performance is demonstrated over a series of benchmark test problems including particle acceleration in non-relativistic parallel shocks. In particular, we reproduce the linear growth of the CR gyro-resonant (streaming and pressure anisotropy) instabilities, under both the periodic and expanding/compressing box setting. We anticipate the code to open up the avenue for a wide range of astrophysical and plasma physics applications. Comment: 20 pages, 19 figures, submitted to MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stad1548 |
| URL الوصول: | http://arxiv.org/abs/2304.10568 |
| رقم الأكسشن: | edsarx.2304.10568 |
| قاعدة البيانات: | arXiv |
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