Section: New Results

Multi-Level Parallelism in a CFD code

Code_Saturne  [19] is an industrial and open source Computational Fluid Dynamics software. Developed at EDF R&D, it solves the Navier-Stokes equations for 2D, 2D-axisymmetric and 3D flows, steady or unsteady, laminar or turbulent, incompressible or weakly dilatable, isothermal or not, with scalars transport if required.

Our goal is to evaluate different ways of improving and preparing this application for the future HPC architectures. We strengthened our application knowledge by using various instrumentation tools and provided a small topology instrumentation library. As instrumentation of a full code can be a tedious thing, we provided a mini application on which to perform our future experiments. We have run experiments to determine the potential gain of topology awareness on our code by using the graph mapping solutions of PT-SCOTCH. We have also run experiments on ghost cells numbering to see the impact of their locations on cache misses.