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Parallel performance of h-type Adaptive Mesh Refinement for Nek5000
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-7448-3290
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
2016 (English)In: ACM International Conference Proceeding Series, Association for Computing Machinery , 2016Conference paper, Published paper (Refereed)
Abstract [en]

We discuss parallel performance of h-type Adaptive Mesh Refinement (AMR) developed for the high-order spectral element solver Nek5000 within CRESTA project. AMR is a desired feature of the future simulation software, as it gives possibility to increase the accuracy of numerical simulations at minimal computational cost by resolving particular region of the domain. At the same time it increases complexity of the communication pattern and introduces load imbalance, that can have negative effect on the code scalability. In this work we concentrate on the parallel performance of different tools required by AMR and the resulting algorithm limitations. Our implementation is based on available libraries for parallel mesh management (p4est) and partitioning (ParMetis) that provide necessary information for grid refinement/coarsening and redistribution performed within nonconforming version of Nek5000. For simplicity we consider advection-diffusion problem instead of the full Navies-Stokes equations and study both strong and weak scalability for the convected-cone problem. It is a synthetic test case allowing to test AMR with frequent dynamic mesh adjustments.

Place, publisher, year, edition, pages
Association for Computing Machinery , 2016.
Keyword [en]
Large-scale scientific computing, Nonconforming methods, Parallel adaptive mesh refinement, Spectral elements, Application programs, Beams and girders, Computational fluid dynamics, Computer software, Numerical analysis, Scalability, Warships, Adaptive mesh refinement, Advection-diffusion problem, Communication pattern, Computational costs, Non-conforming methods, Parallel performance, Simulation software, Spectral element, Mesh generation
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207505DOI: 10.1145/2938615.2938620Scopus ID: 2-s2.0-85014765450OAI: oai:DiVA.org:kth-207505DiVA: diva2:1106129
Conference
2016 Exascale Applications and Software Conference, EASC 2016, 25 April 2016 through 29 April 2016
Note

Conference code: 123835; Export Date: 22 May 2017; Conference Paper. QC 20170607

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-06-07Bibliographically approved

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