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BEGIN:VEVENT
UID:news240@dmi.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20180716T205652
DTSTART;TZID=Europe/Zurich:20160520T110000
SUMMARY:Seminar in Numerical Analysis: Julien Diaz (INRIA)
DESCRIPTION:Seismic imaging techniques such as Reverse Time Migration (RTM)
  or Full  Waveform Inversion (FWI) can be applied in time domain or in fre
 quency  domain. After havind recalled the principle of RTM and discussed t
 he  advantages and drawbacks of both approaches\, we focus on frequential 
  domain. We show the usefulness  of Discontinuous for solving acoustic  a
 nd elastodynamic wave equation\, et we apply the Interior Penalty  Discont
 inuous Galerkin method (IPDG) to the modelling of elasto/acoustic  couplin
 g. We then present an alternative method\, the Hydridizable  Discontinuous
  Galerkin method (HDG)\, which reduces the number of  unknowns of the glob
 al linear system thanks to the introduction of a  Lagrange multiplier defi
 ned only on the faces of the cells of the mesh.  We illustrate the efficie
 ncy of HDG with respect to IPDG thanks to  comparisons on academic and ind
 ustrial test cases.
X-ALT-DESC:Seismic imaging techniques such as Reverse Time Migration (RTM) 
 or Full  Waveform Inversion (FWI) can be applied in time domain or in freq
 uency  domain. After havind recalled the principle of RTM and discussed th
 e  advantages and drawbacks of both approaches\, we focus on frequential  
 domain. We show the usefulness&nbsp\; of Discontinuous for solving acousti
 c  and elastodynamic wave equation\, et we apply the Interior Penalty  Dis
 continuous Galerkin method (IPDG) to the modelling of elasto/acoustic  cou
 pling. We then present an alternative method\, the Hydridizable  Discontin
 uous Galerkin method (HDG)\, which reduces the number of  unknowns of the 
 global linear system thanks to the introduction of a  Lagrange multiplier 
 defined only on the faces of the cells of the mesh.  We illustrate the eff
 iciency of HDG with respect to IPDG thanks to  comparisons on academic and
  industrial test cases. 
DTEND;TZID=Europe/Zurich:20160520T120000
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