Développement d'une méthode hybride RANS-LES temporelle pour la simulation de sillages d'obstacles cylindriques

Abstract : In the field of modelling of turbulent flows, hybrid RANS/LES approaches have recently received a considerable attention due to the combination of the computational cost of RANS and the accuracy of LES.Among them, TPITM (Temporal Partially Integrated Transport Model) is a hybrid RANS/Temporal LES approach that overcomes the inconsistency of the continuous bridging of RANS and LES by using a temporal filtering formalism. However, TPITIM is relatively difficult to implement and, in particular, requires a dynamic correction, contrary to other approaches, in particular DES (Detached Eddy Simulation).The present thesis then proposes a hybrid RANS/LES approach similar to DES, but based on temporal filtering, derived from TPITM using an equivalence criterion, i. e., imposing the same partition of among resolved and modeled energies. This HTLES approach (Hybrid Temporal LES) combines the characteristics of DES (ease of implementation) and of TPITM (consistent formalism, theoretical justification of the coefficients).
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Thanh Tinh Tran. Développement d'une méthode hybride RANS-LES temporelle pour la simulation de sillages d'obstacles cylindriques. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. Français. ⟨NNT : 2013ESMA0007⟩. ⟨tel-00823281⟩

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