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SUMMARY:A logically Cartesian\, adaptively refined two-patch sphere grid f
 or modeling transport in the atmosphere - Donna Calhoun\,   (Boise State U
 niversity)
DTSTART:20120925T130000Z
DTEND:20120925T132500Z
UID:TALK40087@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Recently\, we demonstrated results using a second order\nfinit
 e volume scheme on a novel\, logically Cartesian\, two-patch 2d\nsphere gr
 id. The numerical scheme\, based on the wave-propagation\nalgorithms in Cl
 awpack ( R. J. LeVeque\, Univ. of Washington)\, was\neasily adapted to the
  single grid Cartesian layout of our two-patch\nsphere grid mapping.  Furt
 hermore\, we were able to use an existing\nadaptive mesh refinement patch-
 based (AMR) code (Berger\, Oliger et\nal.) to run computational efficient 
 simulations.\n\nIn our current work\, we are developing a new AMR code whi
 ch uses wave\npropagation algorithms on non-overlapping AMR grids stored a
 s leaves\nin a forest of quad- or oct-trees.  The underlying tree-based co
 de\,\np4est (Carsten Burstedde\, Univ. of Bonn) manages the multi-block\nc
 onnectivity in a multi-processor environment and has been shown to be\nhig
 hly scalable in applications of interest to geophysicists.  This\nnew AMR 
 code\, which we call ForestClaw\, will easily handle the\nadaptivity for o
 ur two-patch sphere grid\, as well as the cubed-sphere\,\nand more general
 ly\, any multi-block geometry.\n\nWe will present preliminary results from
  our efforts to use ForestClaw\nfor modeling volcanic ash dispersal in the
  atmosphere.  This is joint\nwork with Carsten Burstedde (Univ. of Bonn) a
 nd researchers at the\nCascade Volcanic Observatory (Vancouver\, Washingto
 n).\n\n
LOCATION:Seminar Room 1\, Newton Institute
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