Contributions au co-design de noyaux irréguliers sur architectures manycore : cas du remaillage anisotrope multi-échelle en mécanique des fluides numérique.

Abstract : Large-scale 3D numerical simulations of complex flows, such as turbulent ones, often imply a huge computation time for an acceptable accuracy level in an industrial context. To reduce this time, one may iteratively adapt the discretization of the domain (or mesh) to the error of the solution in order to reduce the required number of points, and resort to parallelism to absorb the involved workload. However it is not trivial to adapt this kind of algorithms to take advantage of recent parallel architectures capabilities. Here, we aim to provide anisotropic surface mesh adaptation kernels that are suitable for machines with underclocked manycore processors and/or asymmetric memory latency. In fact, the difficulty is to expose a strong locality (static and minimal impacted vicinity, no dynamic interleaving of operations, no local embedding of the surface) to maximize cores' performance, while remaining as efficient as the state-of-the-art (fast error and mesh quality convergence, minimum surface deformation). The undertaken work is at the interface between parallel processing and applied maths.
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https://tel.archives-ouvertes.fr/tel-01941380
Contributor : Hoby Rakotoarivelo <>
Submitted on : Friday, November 30, 2018 - 11:56:01 PM
Last modification on : Friday, May 17, 2019 - 11:40:31 AM
Long-term archiving on : Friday, March 1, 2019 - 4:32:09 PM

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Hoby Rakotoarivelo. Contributions au co-design de noyaux irréguliers sur architectures manycore : cas du remaillage anisotrope multi-échelle en mécanique des fluides numérique.. Calcul parallèle, distribué et partagé [cs.DC]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLE012⟩. ⟨tel-01941380⟩

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