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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:A Three-Dimensional Finite-Volume Nonhydrostatic I
cosahedral Modle (NIM) - Jin Lee\, (National Oce
anic and Atmosphere Administration)
DTSTART;TZID=Europe/London:20120927T113500
DTEND;TZID=Europe/London:20120927T120000
UID:TALK40211AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/40211
DESCRIPTION:The Nonhydrostatic Icosahedral Model (NIM) formula
tes the latest numerical innovation of the three-d
imensional finite-volume control volume on the qua
si-uniform icosahedral grid suitable for ultra-hig
h resolution simulations. NIMs modeling goal is to
improve numerical accuracy for weather and climat
e simulations as well as to utilize the state-of-a
rt computing architecture such as massive parallel
CPUs and GPUs to deliver routine high-resolution
forecasts in timely manner. NIM uses innovations i
n model formulation similar to its hydrostatic ver
sion of the Flow-following Icosahedral Model (FIM)
developed by Earth System Research Laboratory (ES
RL) which has been tested and accepted for future
use by the National Weather Service as part of the
ir operational global prediction ensemble. Innovat
ions from the FIM used in the NIM include: \n\n* A
local coordinate system remapped spherical surfac
e to plane for numerical accuracy (Lee and MacDona
ld\, 2009)\, * Grid points in a table-driven horiz
ontal loop that allow any horizontal point sequenc
e (A.E. MacDonald\, et al.\, 2010)\, * Flux-Correc
ted Transport formulated on finite-volume operator
s to maintain conservative positive definite trans
port (J.-L\, Lee\, ET. Al.\, 2010)\, * All differe
ntials evaluated as finite-volume integrals around
the cells\, *Icosahedral grid optimization (Wang
and Lee\, 2011) \n\nNIM extends the two-dimensiona
l finite-volume operators used in FIM into the thr
ee-dimensional finite-volume solvers designed to i
mprove pressure gradient calculation and orographi
c precipitation over complex terrain. The NIM dyna
mical core has been successfully verified with var
ious non-hydrostatic benchmark test cases such as
warm bubble\, density current\, internal gravity w
ave\, and mountain waves. Physical parameterizatio
ns have been incorporated into the NIM dynamic cor
e and successfully tested with multimonth aqua-pla
net simulations. \n\n
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:Mustapha Amrani
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