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SUMMARY:FROSch – A Parallel Implementation of the GDSW Domain Decomposit
 ion Preconditioner in Trilinos
DTSTART:20180830T161500
DTEND:20180830T170000
DTSTAMP:20260603T200313Z
UID:34f363e0e577656ef3bb51d4c87e29b5786647b3e18d804808c2dc85
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Alexander Heinlein\, Mathematisches Institut\, Universitä
 t zu Köln\nThe FROSch (Fast and Robust Overlapping Schwarz) library\, a p
 arallel implementation of the GDSW (Generalized Dryja Smith Widlund) preco
 nditioner\, has recently been integrated into Trilinos as part of the pack
 age ShyLU. The GDSW preconditioner has been introduced by Dohrmann\, Klawo
 nn\, and Widlund in 2008 and is a two-level overlapping Schwarz preconditi
 oner with an energy-minimizing coarse space that is inspired by non-overla
 pping domain decomposition methods\, such as FETI-DP and BDDC methods. It 
 is robust for a wide class of problems\, e.g.\, solid or fluid mechanics\,
  and can be constructed in an algebraic way. In particular\, the coarse sp
 ace can be constructed from the fully assembled matrix without an addition
 al coarse triangulation\, even for irregular subdomains. However\, the pre
 conditioner can benefit from additional information about the problem. Thi
 s talk gives an overview of the FROSch code\, its features\, and user-inte
 rface and shows the parallel scalability and robustness of the solver for 
 several problems. In particular\, FROSch is applied to scalar elliptic pro
 blems\, linear elasticity\, and nonlinear elasticity in fluid-structure in
 - teraction applications and as a monolithic preconditioner for saddle-poi
 nt problems. Parallel scalability of the code is shown up to a maximum of 
 64K cores using a direct coarse solver on one core. 
LOCATION:CM 0 9 https://plan.epfl.ch/?room=CM09&dim_floor=0&map_x=533042&m
 ap_y=152526&map_zoom=14
STATUS:CONFIRMED
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