1 research outputs found
Magnetohydrodynamics with GAMER
GAMER, a parallel Graphic-processing-unit-accelerated
Adaptive-MEsh-Refinement hydrodynamic code, has been extended to support
magnetohydrodynamics (MHD) with both the corner-transport-upwind (CTU) and
MUSCL-Hancock schemes and the constraint transport (CT) technique. The
divergent preserving operator for adaptive mesh refinement (AMR) has been
applied to reinforce the divergence-free constraint on the magnetic field.
GAMER-MHD has fully exploited the concurrent executions between the GPU MHD
solver and other CPU computation pertinent to AMR. We perform various standard
tests to demonstrate that GAMER-MHD is both second-order accurate and robust,
producing results as accurate as those given by high-resolution uniform-grid
runs. We also explore a new 3D MHD test, where the magnetic field assumes the
Arnold-Beltrami-Childress (ABC) configuration, temporarily becomes turbulent
with current sheets and finally settles to a lowest-energy equilibrium state.
This 3D problem is adopted for the performance test of GAMER-MHD. The
single-GPU performance reaches and
cell-updates/sec for the single- and double-precision calculations,
respectively, on Tesla P100. We also demonstrate a parallel efficiency of for both weak and strong scaling using XK nodes on the Blue
Waters supercomputers.Comment: 29 pages, 22 figures, 1 table. GAMER-MHD will soon become available
at https://github.com/gamer-project/game