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Université de Provence - Aix-Marseille I Hyper Articles en Ligne |
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Université de Provence - Aix-Marseille I Hyper Articles en Ligne |
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| HAL : inria-00289193, version 2 |
| Voir la fiche détaillée |  BibTeX,EndNote,... |
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| Versions disponibles | v1 (19-06-2008) | v2 (26-06-2008) |
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| A Hybrid Model Based on Continuous Fluctuation Corrections |
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| Maria Vittoria Salvetti 1Hilde Ouvrard 2 |
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| (2008) |
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| A novel method is proposed for blending RANS and VMS-LES approaches in a hybrid model. To this purpose, the flow variables are decomposed in a RANS part (i.e. the averaged flow field), a correction part that takes into account the turbulent large-scale fluctuations, and a third part made of the unresolved or SGS fluctuations. The basic idea is to solve the RANS equations in the whole computational domain and to correct the obtained averaged flow field by adding, where the grid is adequately refined, the remaining resolved fluctuations. The RANS model is of low-Reynolds K-EPSILON type. To obtain a model which progressively switches from the RANS to the LES mode, a smooth blending function is introduced to damp the correction term. Different definitions of the blending function are proposed and investigated. The capabilities of the proposed hybrid approach are appraised in the simulation of the flow around a circular cylinder at $Re=140000$. Results are compared to those of other hybrid simulations in the literature and to experimental data. |
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| 1 : | Dipartimento Ingegneria Aerospaziale "Lucio Lazzarino" (DIA) |
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Università di Pisa |
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| 2 : | Département de Mathématiques [Montpellier] |
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Université Montpellier II - Sciences et techniques |
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| 3 : | SMASH (INRIA Sophia Antipolis) |
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INRIA – Université de Provence - Aix-Marseille I |
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| Domaine | : | Physique/Mécanique/Mécanique des fluides Sciences de l'ingénieur/Mécanique/Mécanique des fluides Mathématiques/Analyse numérique |
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| Turbulence – Hybrid RANS/LES approach – bluff-body flows – variational multi-scale – unstructured meshes |
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| Liste des fichiers attachés à ce document : | |||||
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| inria-00289193, version 2 | |
| http://hal.inria.fr/inria-00289193 | |
| oai:hal.inria.fr:inria-00289193 | |
| Contributeur : Alain Dervieux | |
| Soumis le : Jeudi 26 Juin 2008, 09:50:18 | |
| Dernière modification le : Jeudi 26 Juin 2008, 20:19:20 | |
