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UID:news241@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20180716T205837
DTSTART;TZID=Europe/Zurich:20160513T110000
SUMMARY:Seminar in Numerical Analysis: Frédéric Nataf (CNRS Paris 6)
DESCRIPTION:Optimized Schwarz methods (OSM) are very popular methods which 
 were  introduced by P.L. Lions for elliptic problems and B. Despres for  p
 ropagative wave phenomena. One drawback is the lack of theoretical  result
 s for variable coefficients problems and overlapping  decompositions. We b
 uild here a coarse space for which the convergence  rate of the two-level 
 method is guaranteed regardless of the regularity  of the coefficients. We
  do this by introducing a symmetrized variant of  the ORAS (Optimized Rest
 ricted Additive Schwarz) algorithm. Numerical  results on nearly incompres
 sible elasticity and Stokes system are shown  for systems with hundred of 
 millions of degrees of freedom on high  performance computers.
X-ALT-DESC:Optimized Schwarz methods (OSM) are very popular methods which w
 ere  introduced by P.L. Lions for elliptic problems and B. Despres for  pr
 opagative wave phenomena. One drawback is the lack of theoretical  results
  for variable coefficients problems and overlapping  decompositions. We bu
 ild here a coarse space for which the convergence  rate of the two-level m
 ethod is guaranteed regardless of the regularity  of the coefficients. We 
 do this by introducing a symmetrized variant of  the ORAS (Optimized Restr
 icted Additive Schwarz) algorithm. Numerical  results on nearly incompress
 ible elasticity and Stokes system are shown  for systems with hundred of m
 illions of degrees of freedom on high  performance computers. 
DTEND;TZID=Europe/Zurich:20160513T120000
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