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DTSTAMP:20190719T085745Z
LOCATION:HG E 1.1
DTSTART;TZID=Europe/Stockholm:20190614T110000
DTEND;TZID=Europe/Stockholm:20190614T113000
UID:submissions.pasc-conference.org_PASC19_sess116_msa106@linklings.com
SUMMARY:Highly Parallel Geometric Multigrid Solver Suitable for Adaptive M
 esh Refinement (AMR) Grids in Plasma Simulations
DESCRIPTION:Minisymposium\nComputer Science and Applied Mathematics, Physi
 cs\n\nHighly Parallel Geometric Multigrid Solver Suitable for Adaptive Mes
 h Refinement (AMR) Grids in Plasma Simulations\n\nTeunissen\n\nLarge-scale
  3D simulations of plasma physics phenomena are computationally very expen
 sive. By using adaptive mesh refinement (AMR), the resolution of the numer
 ical grid can be reduced in smooth or uninteresting regions. Through paral
 lelization, computation times can be further reduced. However, the paralle
 l scaling of codes depends on the type of equation that is solved. When so
 lving hyperbolic PDEs explicitly, only local communication is required. Fo
 r elliptic PDEs, such as Poisson's equation, global communication is requi
 red, which complicates their parallel solution. In this talk, a recently d
 eveloped MPI-parallel geometric multigrid library will be presented. This 
 library can be used to efficiently solve elliptic equations in parallel on
  octree AMR grids. The library can extend existing AMR frameworks with an 
 elliptic solver, which we demonstrate by coupling it to MPI-AMRVAC. Severa
 l test cases are presented in which the multigrid routines are used to con
 trol the divergence of the magnetic field in MHD simulations.
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