NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A multigrid solver for semi-implicit global shallow-water modelsA multigrid solver is developed for the discretized two-dimensional elliptic equation on the sphere that arises from a semiimplicit time discretization of the global shallow-water equations. Different formulations of the semiimplicit scheme result in variable-coefficient Helmholtz-type equations for which no fast direct solvers are available. The efficiency of the multigrid solver is optimal, in the sense that the total operation count is proportional to the number of unknowns. Numerical experiments using initial data derived from actual 300-mb height and wind velocity fields indicate that the present model has very good accuracy and stability properties.
Document ID
19900043437
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Barros, Saulo R. M.
(Gesellschaft fuer Mathematik und Datenverarbeitung mbH Bonn, Federal Republic of Germany, United States)
Dee, Dick P.
(New York University NY; Rio de Janeiro, Pontificia Universidade Catolica, Brazil)
Dickstein, Flavio
(Rio de Janeiro, Universidade Federal, Brazil)
Date Acquired
August 14, 2013
Publication Date
March 1, 1990
Publication Information
Publication: Atmosphere - Ocean
Volume: 28
ISSN: 0705-5900
Subject Category
Meteorology And Climatology
Accession Number
90A30492
Funding Number(s)
CONTRACT_GRANT: NAG5-341
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available