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DTSTAMP:20190719T085745Z
LOCATION:HG E 1.2
DTSTART;TZID=Europe/Stockholm:20190614T143000
DTEND;TZID=Europe/Stockholm:20190614T150000
UID:submissions.pasc-conference.org_PASC19_sess144_msa255@linklings.com
SUMMARY:Parallel, Matrix-Free Multigrid on Adaptive Meshes in ASPECT
DESCRIPTION:Minisymposium\nComputer Science and Applied Mathematics, Physi
 cs, Solid Earth Dynamics\n\nParallel, Matrix-Free Multigrid on Adaptive Me
 shes in ASPECT\n\nHeister, Clevenger\n\nWe present recent developments in 
 the community code ASPECT for simulating convection in the Earth's mantle.
  The governing equations are solved using the Finite Element method on ada
 ptively refined meshes, which allows us to resolve features at high resolu
 tion, without intractable computational cost. Nevertheless, linear systems
  can become quite large (100+ million unknowns),<br />so efficient, parall
 el solvers are necessary. We are implementing massively-parallel, matrix-f
 ree, geometric Multigrid solvers to solve the Stokes part of the governing
  equations. We will show benchmark results that confirm far better perform
 ance and<br />scalability compared to the algebraic multigrid solvers buil
 t on assembled matrices, that were used in ASPECT until now. We can show g
 ood scalability to 10,000+ cores and billions of unknowns. These improveme
 nts to linear solvers will hopefully enable new and exciting research.
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