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SUMMARY:Finite difference resistivity modeling on unstructured grids with 
 large conductivity contrasts - Chauris\, H (Mines Paristech)
DTSTART:20111216T153000Z
DTEND:20111216T160000Z
UID:TALK35001@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The resolution of the 3-D electrical forward problem faces sev
 eral difficulties. Besides the singularity at the source location\, major 
 issues are caused by the definition of the computational domain to match a
  particular topography\, and by high conductivity contrasts. To address th
 ese issues\, we combine here two methods. First\, we implement a specific 
 finite difference method that takes into account specified interfaces in e
 lliptic problems. Here\, the contrasts are defined along grid lines. Secon
 d\, we extend the method to unstructured meshes by integrating it to the g
 eneralized finite difference technique. In practice\, once the conductivit
 y model is defined\, the approach does not need to explicitly specify wher
 e the large contrasts are located. Several numerical tests are carried out
  for various Poisson problems and show a high degree of accuracy.  \n
LOCATION:Seminar Room 1\, Newton Institute
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