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SUMMARY:On the efficiency of an H-matrix based direct solver for the Bound
 ary Element Method in 3D elastodynamics
DTSTART:20171013T121500
DTEND:20171013T131500
DTSTAMP:20261005T041030Z
UID:194e131464b716d380710b6a6862e297a73fbd614b10bae0de4abd4a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Stéphanie Chaillat\, ENSTA Paristech -- CNRS\, Paris\, Fra
 nce\nThe main advantage of the Boundary Element Method (BEM) is that only 
 the domain boundaries are discretized leading to a drastic reduction of th
 e total number of degrees of freedom. In traditional BE implementation the
  dimensional advantage with respect to domain discretization methods is of
 fset by the fully-populated nature of the BEM coefficient matrix. In the p
 resent work\, we propose a fast method to solve the BEM system in 3-D freq
 uency-domain elastodynamics. Using the H-matrix arithmetic and low-rank ap
 proximations (performed with Adaptive Cross Approximation)\, we derive a f
 ast direct solver. We assess the numerical efficiency and accuracy on the 
 basis of numerical results obtained for problems having known solutions. I
 n particular\, we study the efficiency of low-rank approximations when the
  frequency is increased. \n\nBio :\nDr Stéphanie Chaillat is a CNRS rese
 arch scientist in the POEMS group in the Applied Mathematics department of
  ENSTA (Ecole Nationale Superieure des Techniques Avancées) in Palaiseau\
 , France. Her research interests notably span boundary integral equations 
 and boundary elements\, inverse problems for elastodynamics with applicati
 ons in seismology and mechanics.  She graduated in 2006 as a civil engine
 er from Ecole Nationale des Travaux Publics de l'Etat\, Lyon\, France\, an
 d got her PhD at the Laboratoire de Mécanique des Solides of Ecole Polyte
 chnique\, Palaiseau France in 2008. She has received the National PhD Awar
 d from the French Computational Mechanics Association\, and the European P
 hD Award from the European Community on Computational Methods in Applied S
 ciences (ECCOMAS) for her work on Fast Multipole Method for 3-D elastodyna
 mic boundary integral equations.
LOCATION:GC C3 30 https://plan.epfl.ch/?room=GCC330
STATUS:CONFIRMED
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