A Parallel Aggregation Algorithm for Inter-Grid Transfer Operators in Algebraic Multigrid

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dc.contributor.authorGarcia Hilares, Nilton Alanen
dc.contributor.committeechairEmbree, Mark P.en
dc.contributor.committeememberde Sturler, Ericen
dc.contributor.committeememberWarburton, Timothyen
dc.contributor.departmentMathematicsen
dc.date.accessioned2019-10-17T14:53:17Zen
dc.date.available2019-10-17T14:53:17Zen
dc.date.issued2019-09-13en
dc.description.abstractAs finite element discretizations ever grow in size to address real-world problems, there is an increasing need for fast algorithms. Nowadays there are many GPU/CPU parallel approaches to solve such problems. Multigrid methods can be used to solve large-scale problems, or even better they can be used to precondition the conjugate gradient method, yielding better results in general. Capabilities of multigrid algorithms rely on the effectiveness of the inter-grid transfer operators. In this thesis we focus on the aggregation approach, discussing how different aggregation strategies affect the convergence rate. Based on these discussions, we propose an alternative parallel aggregation algorithm to improve convergence. We also provide numerous experimental results that compare different aggregation approaches, multigrid methods, and conjugate gradient iteration counts, showing that our proposed algorithm performs better in serial and parallel.en
dc.description.abstractgeneralModeling real-world problems incurs a high computational cost because these mathematical models involve large-scale data manipulation. Thus we need fast and efficient algorithms. Nowadays there are many high-performance approaches for these problems. One such method is called the Multigrid algorithm. This approach models a physical domain using a hierarchy of grids, and so the effectiveness of these approaches relies on how well data can be transferred from grid to grid. In this thesis, we focus on the aggregation approach, which clusters a grid’s vertices according to its connections. We also provide an alternative parallel aggregation algorithm to give a faster solution. We show numerous experimental results that compare different aggregation approaches and multigrid methods, showing that our proposed algorithm performs better in serial and parallel than other popular implementations.en
dc.format.mediumETDen
dc.identifier.urihttp://hdl.handle.net/10919/94618en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.rightsCreative Commons Attribution-ShareAlike 3.0 United Statesen
dc.rights.urihttp://creativecommons.org/licenses/by-sa/3.0/us/en
dc.subjectAlgebraic multigriden
dc.subjectAggregationen
dc.subjectMaximal independent seten
dc.subjectPoisson's equationen
dc.titleA Parallel Aggregation Algorithm for Inter-Grid Transfer Operators in Algebraic Multigriden
dc.typeThesisen
thesis.degree.disciplineMathematicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameM.S.en

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