Efficient multigrid preconditioners for atmospheric flow simulations at high aspect ratio
Efficient multigrid preconditioners for atmospheric flow simulations at high aspect ratio
复制标题
用于高纵横比大气流动模拟的高效多重网格预处理器
DOI:
10.1002/fld.4072
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发表时间:
2015
影响因子:
1.8
通讯作者:
Dedner A
中科院分区:
文献类型:
--
作者:
Dedner A
Many problems in fluid modelling require the efficient solution of highly anisotropic elliptic partial differential equations (PDEs) in ‘flat’ domains. For example, in numerical weather and climate prediction, an elliptic PDE for the pressure correction has to be solved at every time step in a thin spherical shell representing the global atmosphere. This elliptic solve can be one of the computationally most demanding components in semi‐implicit semi‐Lagrangian time stepping methods, which are very popular as they allow for larger model time steps and better overall performance. With increasing model resolution, algorithmically efficient and scalable algorithms are essential to run the code under tight operational time constraints. We discuss the theory and practical application of bespoke geometric multigrid preconditioners for equations of this type. The algorithms deal with the strong anisotropy in the vertical direction by using the tensor‐product approach originally analysed by Börm and Hiptmair [Numer. Algorithms, 26/3 (2001), pp. 219–234]. We extend the analysis to three dimensions under slightly weakened assumptions and numerically demonstrate its efficiency for the solution of the elliptic PDE for the global pressure correction in atmospheric forecast models. For this, we compare the performance of different multigrid preconditioners on a tensor‐product grid with a semi‐structured and quasi‐uniform horizontal mesh and a one‐dimensional vertical grid. The code is implemented in the Distributed and Unified Numerics Environment, which provides an easy‐to‐use and scalable environment for algorithms operating on tensor‐product grids. Parallel scalability of our solvers on up to 20 480 cores is demonstrated on the HECToR supercomputer. Copyright © 2015 John Wiley & Sons, Ltd.
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DOI:
--
发表时间:
2002
期刊:
International Conference on High Performance Computing for Computational Science
影响因子:
--
作者:
A. Qaddouri;J. Côté
通讯作者:
J. Côté
DOI:
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发表时间:
1992
期刊:
影响因子:
--
作者:
John C. Adams;R. Garcia;B. Gross;J. Hack;D. Haidvogel;V. Pizzo
通讯作者:
V. Pizzo
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
J. Bates;F. Semazzi;R. W. Higgins;Saulo R. M. Barros
通讯作者:
Saulo R. M. Barros
DOI:
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发表时间:
1991
期刊:
影响因子:
--
作者:
Adams
通讯作者:
Adams
DOI:
10.1137/0913035
发表时间:
1992-03-01
期刊:
SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING
影响因子:
--
作者:
VANDERVORST, HA
通讯作者:
VANDERVORST, HA