Study of Vlasov simulation techniques for next-generation supercomputers

我们研究了第二代空间等离子体计算机模拟技术的第一性原理Vlasov程序的数值格式。我们开发了数值算法求解无碰撞玻尔兹曼（弗拉索夫）方程，这是一个超维守恒律。新的模拟代码针对标量大规模并行计算机进行了并行化，并在1,000多个CPU内核上实现了80%以上的并行效率。新的代码适用于各种多尺度过程中的空间等离子体。数值模拟结果表明，流体尺度和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.