耗散效应对Vlasov系统宏观演化的影响
Impact of dissipative effects on the macroscopic evolution of a Vlasov system
摘要：
数值扩散引入任何数值方案，只要小尺度波动，产生的动态演化过程中的碰撞等离子体，变得可比的网格大小。本文通过研究双流不稳定性的非线性区域，研究了数值耗散在无碰撞等离子体模拟中的作用。我们证明了所使用的算法可以影响Vlasov-Poisson系统的长时间演化。
英文摘要：
Numerical diffusion is introduced by any numerical scheme as soon as small scales fluctuations, generated during the dynamical evolution of a collisionless plasma, become comparable to the grid size. Here we investigate the role of numerical dissipation in collisionless plasma simulations by studying the non linear regime of the two stream instability. We show that the long time evolution of the Vlasov - Poisson system can be affected by the used algorithm.
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