Study of Vlasov simulation techniques for next-generation supercomputers

作为空间等离子体的第二代计算机模拟技术，我们研究了第一原理Vlasov程序的数值格式。我们发展了求解无碰撞Boltzmann(Vlasov)方程的数值算法，这是一个超维守恒律。新的模拟代码在标量大规模并行计算机上进行了并行化，在1000多个CPU核上获得了80%以上的并行效率。新程序适用于空间等离子体中的各种多尺度过程。数值结果表明，流体尺度与颗粒尺度之间存在跨尺度耦合。

We study numerical schemes for the first-principle Vlasov code as a second-next-generation computer simulation technique of space plasma. We developed numerical algorithms for solving the collisionless Boltzmann (Vlasov) equation which is a hyper-dimensional conservation law. The new simulation code is parallelized for scalar massively parallel computers and has achieved more than 80% parallel efficiency on more than 1,000 CPU cores. The new code is applied to various multi-scale processes in space plasma. The numerical results imply the existence of cross-scale coupling between fluid scale and particle scale.