Cinmemj: Cinmemj moved page Draft Samper 786704007 to Badia Olm 2017a

2020-04-07T14:57:15Z

Cinmemj moved page Draft Samper 786704007 to Badia Olm 2017a

Cinmemj at 14:56, 7 April 2020

2020-04-07T14:56:51Z

Cinmemj: Created page with "==1 Title, abstract and keywords

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-==1 Title, abstract and keywords<!-- Your document should start with a concise and informative title. Titles are often used in information-retrieval systems. Avoid abbreviations and formulae where possible. Capitalize the first word of the title.
+== Abstract ==
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+In this work, we propose two-level space-time domain decomposition preconditioners for parabolic problems discretized using finite elements. They are motivated as an extension to space-time of balancing domain decomposition by constraints preconditioners. The key ingredients to be defined are the subassembled space and operator, the coarse degrees of freedom (DOFs) in which we want to enforce continuity among subdomains at the preconditioner level, and the transfer operator from the subassembled to the original finite element space. With regard to the subassembled operator, a perturbation of the time derivative is needed to end up with a well-posed preconditioner. The set of coarse DOFs includes the time average (at the space-time subdomain) of classical space constraints plus new constraints between consecutive subdomains in time. Numerical experiments show that the proposed schemes are weakly scalable in time, i.e., we can efficiently exploit increasing computational resources to solve more time steps in the same total elapsed time. Further, the scheme is also weakly space-time scalable, since it leads to asymptotically constant iterations when solving larger problems both in space and time. Excellent wall clock time weak scalability is achieved for space-time parallel solvers on some thousands of cores No separate or additional fees are collected for access to or distribution of the work.
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← Older revision	Revision as of 14:57, 7 April 2020
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Badia Olm 2017a - Revision history

Cinmemj: Cinmemj moved page Draft Samper 786704007 to Badia Olm 2017a

Cinmemj at 14:56, 7 April 2020

Cinmemj: Created page with "==1 Title, abstract and keywords