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            <title xml:lang="fr">Reconstruction Volumique de Résultats de Simulation à Base Chimère</title>
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                <title xml:lang="fr">Reconstruction Volumique de Résultats de Simulation à Base Chimère</title>
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                <term xml:lang="fr">simulation numérique des écoulements</term>
                <term xml:lang="fr">grilles de simulation</term>
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              <p>Computationnal fluid dynamics is an essential step in gas turbine modelling. Continuous optimization of turbines has led to sophisticated geometries, which raise severe issues for the design of adapted simulation grids. The chimera technique aims at relaxing geometry matching constraints by allowing grids overlap. However, post-processing of simulation results performed over chimera grids raises new issues because usual tools are not tuned for this particular geometric configurations. In the framework of the MOSART programme of the world competitiveness cluster Aerospace Valley, we have been working in collaboration with Turbomeca in order to develop a technique for the volumetric reconstruction of chimera simulation results. We propose an innovative method that allows us to build a collection of non-overlapping grids while preserving the main properties of the former simulation grids and featuring boundary conforming property everywhere. The theorical complexity of our algorithms has proved to be linear in the size of the former grids and leads to computation times of a few seconds for grids of hundreds of thousands of cells. The main impact of this work leads in the possibility of using any post-processing tool, including a large number of OpenSource solutions, for post-processing chimera simulation results, which is a mandatory condition for the wide acceptance of this method by industry actors.</p>
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