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SUMMARY:Numerical Simulations with a Three-Dimensional Spectral Element Mo
 del - Sasa Gabersek\,   (Naval Research Laboratory)
DTSTART:20120927T130000Z
DTEND:20120927T132500Z
UID:TALK40221@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Highly accurate numerical methods for solving partial differen
 tial equations that have been traditionally used in the computational flui
 d dynamics have yet to be fully exploited for geophysical fluid dynamics a
 pplications\, such as weather prediction. We will present results obtained
  with a fully compressible\, non-hydrostatic spectral element (SE) model i
 n three dimensions. All of our results are obtained using an eighth order 
 polynomial (p=8)\, which provides the best compromise between accuracy and
  computational cost. The number of elements (h)\, into which the computati
 onal domain is decomposed\, is varied among experiments to achieve differe
 nt effective spatial resolutions. \n\nIntroducing physical parameterizatio
 ns into an SE model is challenging due to a number of aspects including th
 e varying nodal spacing within each element. We highlight some of these ch
 allenges and our approaches to address them. The model is applied in a ser
 ies of idealized experiments that include physical process parameterizatio
 ns such as: i) flow over complex terrain with sub-grid scale mixing\, and 
 ii) a sea breeze that includes an evolving planetary boundary layer with s
 urface fluxes. \n\nWe discuss the issues that arise when physical paramete
 rizations are introduced into SE models. Also\, scalability results over m
 any computational cores will be addressed. In addition\, we will compare t
 he efficiency and accuracy of the results with a finite difference model (
 FD). \n\n
LOCATION:Seminar Room 1\, Newton Institute
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