Non-conforming elements in nek5000: Pressure preconditioning and parallel performance
Peplinski A, Offermans N, Fischer PF, Schlatter P (2020)
Publication Type: Conference contribution
Publication year: 2020
Journal
Publisher: Springer
Book Volume: 134
Pages Range: 599-609
Conference Proceedings Title: Lecture Notes in Computational Science and Engineering
Event location: London, GBR
ISBN: 9783030396466
DOI: 10.1007/978-3-030-39647-3_48
Abstract
Adaptive mesh refinement (AMR) is an important component of modern numerical solvers, as it allows to control the computational error during the simulation, increasing the reliability of the numerical modelling and giving the possibility to study a broad range of different phenomena even without knowing the physics a priori. In this work we present selected aspects of the implementation and parallel performance of a new h-type AMR framework developed for the high-order CFD solver Nek5000; the development was done within the ExaFLOW EU project. We utilise in this case the natural domain decomposition inherent to the spectral element method (SEM), which constitutes the main source of parallelism and provides meshing flexibility that can be exploited in AMR. We use standard libraries for parallel mesh management (p4est) and partitioning (ParMetis) and focus on developing efficient preconditioners for the pressure problem solved on non-conforming meshes. Two different approaches are considered: an additive overlapping Schwarz and a hybrid Schwarz-multigrid method. The strong scaling is shown on the example of the simulation of the turbulent flow around a NACA4412 wing section at Re = 200, 000.
Authors with CRIS profile
Involved external institutions
Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH)
Sweden (SE)
University of Illinois at Urbana-Champaign
United States (USA) (US)
Sweden (SE)
University of Illinois at Urbana-Champaign
United States (USA) (US)
How to cite
APA:
Peplinski, A., Offermans, N., Fischer, P.F., & Schlatter, P. (2020). Non-conforming elements in nek5000: Pressure preconditioning and parallel performance. In Spencer J. Sherwin, Joaquim Peiró, Peter E. Vincent, David Moxey, Christoph Schwab (Eds.), Lecture Notes in Computational Science and Engineering (pp. 599-609). London, GBR: Springer.
MLA:
Peplinski, A., et al. "Non-conforming elements in nek5000: Pressure preconditioning and parallel performance." Proceedings of the 12th International Conference on Spectral and High-Order Methods, ICOSAHOM 2018, London, GBR Ed. Spencer J. Sherwin, Joaquim Peiró, Peter E. Vincent, David Moxey, Christoph Schwab, Springer, 2020. 599-609.
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