High performance parallel computing of flows in complex geometries

Laurent Y.M. Gicquel; N. Gourdain; J.-F. Boussuge; H. Deniau; G. Staffelbach; P. Wolf; Thierry Poinsot

doi:10.1016/j.crme.2010.11.006

High performance parallel computing of flows in complex geometries
[Calcul parallèle haute performance des écoulements en géométries complexes]

Laurent Y.M. Gicquel ¹ ; N. Gourdain ¹ ; J.-F. Boussuge ¹ ; H. Deniau ¹ ; G. Staffelbach ¹ ; P. Wolf ¹ ; Thierry Poinsot ²

¹ CERFACS, 42, avenue Georges-Coriolis, 31057 Toulouse cedex , France
² IMFT, 1, allée du Professeur Camille-Soula, 31400 Toulouse, France

Comptes Rendus. Mécanique, Volume 339 (2011) no. 2-3, pp. 104-124.

Résumé
Abstract

L'utilisation et l'accès à des codes de calcul numérique tirant avantage de la puissance croissante des calculateurs hautes-performances, est devenu un élément clef dans les domaines de la production d'énergie et des transports. Ces outils sont non seulement critiques d'un point de vue scientifique mais aussi pour les concepteurs de l'industrie. En effet, les écoulements autour des produits industriels de l'énergie ou de l'aéronautique sont si compliqués qu'ils nécessitent souvent l'utilisation de modèles simplifiés avec l'hypothèse de stationnarité. Ce document présente comment les dévelopements récents des codes de calcul et des calculateurs massivement parallèles peuvent aider à repousser ces limites. Dans cet environement particulier, de nouveaux challenges technologiques et scientifiques peuvent être abordés en utilisant efficacement des milliers de coeurs de calcul en parallèle. Le parallèlisme de ces solveurs modernes est décrit avec un regard particulier sur le découpage de maillage, d'équilibrage de charge et de communication. Deux exemples issus des travaux du CERFACS sont utilisés pour illustrer ces concepts : un code de calcul multi-blocs structuré dédié à la simulation des écoulements avions et turbo-machines ainsi qu'un code non structuré ciblant les écoulements dans les turbines à gaz. Pour finir, des axes de recherche et développements de ces codes et calculateurs sont énnoncées afin d'identifier les utilisations futures possibles et en accord avec les besoins industriels apparaissant lors de la définition des futures concepts d'avions et turbines à gaz.

Efficient numerical tools taking advantage of the ever increasing power of high-performance computers, become key elements in the fields of energy supply and transportation, not only from a purely scientific point of view, but also at the design stage in industry. Indeed, flow phenomena that occur in or around the industrial applications such as gas turbines or aircraft are still not mastered. In fact, most Computational Fluid Dynamics (CFD) predictions produced today focus on reduced or simplified versions of the real systems and are usually solved with a steady state assumption. This article shows how recent developments of CFD codes and parallel computer architectures can help overcoming this barrier. With this new environment, new scientific and technological challenges can be addressed provided that thousands of computing cores are efficiently used in parallel. Strategies of modern flow solvers are discussed with particular emphases on mesh-partitioning, load balancing and communication. These concepts are used in two CFD codes developed by CERFACS: a multi-block structured code dedicated to aircrafts and turbo-machinery as well as an unstructured code for gas turbine flow predictions. Leading edge computations obtained with these high-end massively parallel CFD codes are illustrated and discussed in the context of aircrafts, turbo-machinery and gas turbine applications. Finally, future developments of CFD and high-end computers are proposed to provide leading edge tools and end applications with strong industrial implications at the design stage of the next generation of aircraft and gas turbines.

Publié le : 2011-01-08

DOI : 10.1016/j.crme.2010.11.006

Keywords: Computer science, Parallel computing, Computational Fluid Dynamics
Mot clés : Informatique, Calcul parallèle, Dynamique des fluides numérique

Affiliations des auteurs :

Laurent Y.M. Gicquel ¹ ; N. Gourdain ¹ ; J.-F. Boussuge ¹ ; H. Deniau ¹ ; G. Staffelbach ¹ ; P. Wolf ¹ ; Thierry Poinsot ²

¹ CERFACS, 42, avenue Georges-Coriolis, 31057 Toulouse cedex , France
² IMFT, 1, allée du Professeur Camille-Soula, 31400 Toulouse, France

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     author = {Laurent Y.M. Gicquel and N. Gourdain and J.-F. Boussuge and H. Deniau and G. Staffelbach and P. Wolf and Thierry Poinsot},
     title = {High performance parallel computing of flows in complex geometries},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {104--124},
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     number = {2-3},
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Laurent Y.M. Gicquel; N. Gourdain; J.-F. Boussuge; H. Deniau; G. Staffelbach; P. Wolf; Thierry Poinsot. High performance parallel computing of flows in complex geometries. Comptes Rendus. Mécanique, Volume 339 (2011) no. 2-3, pp. 104-124. doi : 10.1016/j.crme.2010.11.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.11.006/

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