Comparison between algebraic and matrix‐free geometric multigrid for a Stokes problem on adaptive meshes with variable viscosity
Comparison between algebraic and matrix‐free geometric multigrid for a Stokes problem on adaptive meshes with variable viscosity
复制标题
具有可变粘度的自适应网格上的斯托克斯问题的代数和无矩阵几何多重网格之间的比较
DOI:
10.1002/nla.2375
复制
发表时间:
2021
影响因子:
4.3
通讯作者:
Heister, Timo
中科院分区:
文献类型:
--
作者:
Clevenger, Thomas C.;Heister, Timo
Problems arising in Earth's mantle convection involve finding the solution to Stokes systems with large viscosity contrasts. These systems contain localized features which, even with adaptive mesh refinement, result in linear systems that can be on the order of 109or more unknowns. One common approach for preconditioning to the velocity block of these systems is to apply an Algebraic Multigrid (AMG) V‐cycle (as is done in the ASPECT software, for example), however, we find that AMG is lacking robustness with respect to problem size and number of parallel processes. Additionally, we see an increase in iteration counts with refinement when using AMG. In contrast, the Geometric Multigrid (GMG) method, by using information about the geometry of the problem, should offer a more robust option.Here we present a matrix‐free GMG V‐cycle which works on adaptively refined, distributed meshes, and we will compare it against the current AMG preconditioner (Trilinos ML) used in theASPECT1software. We will demonstrate the robustness of GMG with respect to problem size and show scaling up to 114,688 cores and 217 billion unknowns. All computations are run using the open‐source, finite element librarydeal.II.2
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DOI:
--
发表时间:
2021
期刊:
--
影响因子:
--
作者:
通讯作者:
--
DOI:
10.1016/j.jocs.2018.12.006
发表时间:
2019-02
期刊:
J. Comput. Sci.
影响因子:
--
作者:
S. Bauer;M. Huber;S. Ghelichkhan;M. Mohr;U. Rüde;B. Wohlmuth
通讯作者:
S. Bauer;M. Huber;S. Ghelichkhan;M. Mohr;U. Rüde;B. Wohlmuth
影响因子:
3.1
作者:
M. Kronbichler;W. Wall
通讯作者:
W. Wall
影响因子:
2.7
作者:
Clevenger, Thomas C.;Heister, Timo;Kanschat, Guido;Kronbichler, Martin
通讯作者:
Kronbichler, Martin
DOI:
10.1137/16m108450x
发表时间:
2016
期刊:
ArXiv
影响因子:
--
作者:
J. Rudi;G. Stadler;O. Ghattas
通讯作者:
O. Ghattas