Development of multi-hierarchy simulation model with non-uniform space grids for collisionless driven reconnection

Abstract

A multi-hierarchy simulation model aimed at magnetic reconnection studies has been developed, in which macroscopic and microscopic physics are solved self-consistently and simultaneously. In this work, the previous multi-hierarchy model by these authors is extended to a more realistic one with non-uniform space grids. Based on the domain decomposition method, the multi-hierarchy model consists of three parts: a magnetohydrodynamics algorithm to express the macroscopic global dynamics, a particle-in-cell algorithm to describe the microscopic kinetic physics, and an interface algorithm to interlock macro and micro hierarchies. For its verification, plasma flow injection is simulated in this multi-hierarchy model and it is confirmed that the interlocking method can describe the correct physics. Furthermore, this model is applied to collisionless driven reconnection in an open system. Magnetic reconnection is found to occur in a micro hierarchy by injecting plasma from a macro hierarchy. V C 2013 AIP Publishing LLC.

Development of Simulation Code Connecting Particle-in-Cell and Magnetohydrodynamics on Hierarchical Mesh

“…We extend the MHD domain of the PIC-MHD code (Usami et al 2008 [4],2009 [5],2012 [6],2013 [7]) by the AMR-controlled hierarchical mesh (Ogawa et al 2006 [8]). The PIC domain places at the center of the simulation box, connecting via the interface domain to the MHD domain.…”

“…It can suppress the artifitial heating/cooling in the interface domain (Usami et al 2012 [6] and 2013 [7]). PIC advances with time step intervals smaller than ones of MHD.…”

“…Particle-in-Cell (PIC) does describe particle dynamics, but it is difficult to apply the technique onto a large simulation region because of high computational costs. Usami et al (2008 [4],2009 [5],2012 [6],2013 [7]) adopt the method which divides the simulation box into a PIC domain, relatively small region, and a MHD domain. They intend to set the PIC domain onto a reconnection point and its environs, on which particle dynamics play an important role, and place the MHD domain by the both side of it.…”

Improvement of the Multi-Hierarchy Simulation Model Based on the Real-Space Decomposition Method

“…In this section, let us overview the interlocking scheme in the interface domain in the upstream direction, which is taken to be y-axis. We employ the hand-shake scheme [6,8,14,17,20] for a macroscopic quantity Q interface :…”

“…After these two kinds of examination simulations, we applied our multi-hierarchy model to magnetic reconnection [15,16]. In 2013, we further implemented non-uniform grid points to the MHD domain in our multi-hierarchy model [17]. In 2014, we reported the influence of global plasma inflows on the physics of magnetic reconnection by using our multi-hierarchy model [8].…”