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SUMMARY:Ultra-High Resolution Atmospheric Modeling Using Cut Cells - Hiroe
  Yamazaki\, Division of Earth and Planetary Sciences\, Graduate School of 
 Science\, Kyoto University\, Japan
DTSTART:20110308T130000Z
DTEND:20110308T140000Z
UID:TALK29841@talks.cam.ac.uk
CONTACT:Louise Mortimer
DESCRIPTION:Synchronizing with the rapid development of computer technolog
 y\, resolutions of atmospheric numerical\nmodels have increased significan
 tly. One of the most pressing concerns of high-resolution\natmospheric mod
 eling is handling of steep slopes in mountainous areas. In this study\, a 
 cut cell\nmethod for representing topography on a Cartesian grid is applie
 d to a two-dimensional nonhydrostatic\natmospheric model to achieve highly
 -precise simulations over steep terrain. Small cells cut\nby topography ar
 e combined with neighboring cells either vertically or horizontally to avo
 id severe\nrestrictions on time steps by the CFL condition. A unique stagg
 ered arrangement of variables\nused along with the cell-combining approach
  enables quite simple computations of momentum\nequations without the eval
 uation of surface pressure and reduces the computational cost of combining
 \ncells for the velocity variables (Yamazaki and Satomura 2010).\n\nThe re
 sults of two-dimensional numerical simulations of mountain waves using the
  developed\nmodel will be presented. The model successfully reproduces flo
 ws over a wide range of slopes\nfrom a gently sloping bell-shaped mountain
  to an extremely steep cliff with slopes over 80 degrees.\nA brief introdu
 ction of some recent developments will conclude the presentation.\n\nRefer
 ences:\nYamazaki\, H. and T. Satomura\, 2010: Nonhydrostatic atmospheric m
 odeling using a combined\nCartesian grid\, Monthly Weather Review\, 138\, 
 pp. 3932-3945\, doi:10.1175/2010MWR3252.1
LOCATION:Rutherford Seminar Room\, Cavendish Laboratory
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