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Large scale simulation of turbulence using a hybrid spectral/finite difference solver

Bodart, Julien and Joly, Laurent and Cazalbou, Jean-Bernard Large scale simulation of turbulence using a hybrid spectral/finite difference solver. (2009) In: 21st International Conference on Parallel Computational Fluid Dynamics (ParCFD), 18-22 May 2009, Moffet Field, United States .

(Document in English)

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Performing Direct Numerical Simulation (DNS) of turbulence on large-scale systems (offering more than 1024 cores) has become a challenge in high performance computing. The computer power increase allows now to solve flow problems on large grids (with close to 10^9 nodes). Moreover these large scale simulations can be performed on non-homogeneous turbulent flows. A reasonable amount of time is needed to converge statistics if the large grid size is combined with a large number of cores. To this end we developed a Navier-Stokes solver, dedicated to situations where only one direction is heterogeneous, and particularly suitable for massive parallel architecture. Based on an hybrid approach spectral/finite-difference, we use a volumetric decomposition of the domain to extend the FFTs computation to a large number of cores. Scalability tests using up to 32K cores as well as preliminary results of a full simulation are presented.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:17 Dec 2009 11:03

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