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SUMMARY:Block-Structured Adaptive Mesh Refinement in the Bisicles Ice Shee
 t Model - Dr Stephen Cornford\, University of Bristol
DTSTART:20130725T100000Z
DTEND:20130725T110000Z
UID:TALK46347@talks.cam.ac.uk
CONTACT:Rosie Williams
DESCRIPTION:Any numerical model of Antarctic ice sheet needs to address th
 e possibility  of grounding line migration. That can be computationally di
 fficult because the horizontal scale length of features close to the groun
 ding line is tiny -- on the order of a square kilometre -- compared to the
  millions of square kilometres covered by the ice sheet. Conventional disc
 retization methods can take advantage of non-uniform meshes\, with  fine r
 esolution in exciting parts of the domain and coarse resolution in dull pa
 rts\, but are then faced with the possibility that the grounding line migh
 t move and sweep out much of the domain\, making all of it potentially exc
 iting.\n\nThe BISICLES ice sheet model is a conventional finite volume mod
 el that employs a block-structured mesh of rectangular cells to obtain hig
 h resolution at the grounding line. In some ways that is restrictive compa
 red to (say) an unstructured mesh of triangles\, but it has three points i
 n its favour. Most importantly\, it is fairly straightforward to compute a
 nd use new meshes as the simulation progresses\, but on top of that there 
 is an obvious domain decomposition that can be exploited for parallel comp
 uting. It is also  natural to construct a geometric multigrid solver for t
 he stress-balance equations\, although recent developments point us toward
 s a more generic class of multigrid methods.\n
LOCATION:British Antarctic Survey\, Room 330B
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