BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//talks.cam.ac.uk//v3//EN
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
TZOFFSETFROM:+0000
TZOFFSETTO:+0100
TZNAME:BST
DTSTART:19700329T010000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0100
TZOFFSETTO:+0000
TZNAME:GMT
DTSTART:19701025T020000
RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
CATEGORIES:Laboratory for Scientific Computing
SUMMARY:Ultra-High Resolution Atmospheric Modeling Using C
 ut Cells - Hiroe Yamazaki\, Division of Earth and 
 Planetary Sciences\, Graduate School of Science\, 
 Kyoto University\, Japan
DTSTART;TZID=Europe/London:20110308T130000
DTEND;TZID=Europe/London:20110308T140000
UID:TALK29841AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/29841
DESCRIPTION:Synchronizing with the rapid development of comput
 er technology\, resolutions of atmospheric numeric
 al\nmodels have increased significantly. One of th
 e most pressing concerns of high-resolution\natmos
 pheric modeling is handling of steep slopes in mou
 ntainous areas. In this study\, a cut cell\nmethod
  for representing topography on a Cartesian grid i
 s applied to a two-dimensional nonhydrostatic\natm
 ospheric model to achieve highly-precise simulatio
 ns over steep terrain. Small cells cut\nby topogra
 phy are combined with neighboring cells either ver
 tically or horizontally to avoid severe\nrestricti
 ons on time steps by the CFL condition. A unique s
 taggered arrangement of variables\nused along with
  the cell-combining approach enables quite simple 
 computations of momentum\nequations without the ev
 aluation of surface pressure and reduces the compu
 tational 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 flows
  over a wide range of slopes\nfrom a gently slopin
 g bell-shaped mountain to an extremely steep cliff
  with slopes over 80 degrees.\nA brief introductio
 n of some recent developments will conclude the pr
 esentation.\n\nReferences:\nYamazaki\, H. and T. S
 atomura\, 2010: Nonhydrostatic atmospheric modelin
 g using a combined\nCartesian grid\, Monthly Weath
 er Review\, 138\, pp. 3932-3945\, doi:10.1175/2010
 MWR3252.1
LOCATION:Rutherford Seminar Room\, Cavendish Laboratory
CONTACT:Louise Mortimer
END:VEVENT
END:VCALENDAR