Modélisation des écoulements turbulents en rotation et en présence de transferts thermiques par approche hybride RANS/LES zonale

Abstract : The numerical simulation of turbulent flows in cooling system of hydrau- lic pumps sealing requires considering large computational domains and long integration times. The zonal hybrid RANS/LES modelling of turbulence could deal with such appli- cations, in order to reproduce the whole thermal and dynamical phenomena of the flow, with a computational cost compatible with industrial studies. This approach aims at pro- perly interfacing a Large Eddy Simulation (LES), which provides an accurate unsteady description of turbulence in some critical regions of the flow, with the statistical RANS approach, less demanding in computational resources, applied in the whole remaining fluid domain in order to take into account the imposed global variations of the flow (cool water injection in hot water, shaft and rotor rotation, ...). To this end, a detailed study of tur- bulence models appropriate for rotating flows is presented, following both the RANS and the LES approaches. Numerous turbulence models are compared in the rotating channel flow test case. The zonal coupling at boundary faces using the Synthetic Eddy Method (SEM) is studied and an innovative volumic coupling using a source term on overlapping RANS/LES area, the Anisotropic Linear Forcing, is proposed. For the first time, these two coupling methods are extended to heat transfer. The present zonal hybrid RANS/LES computations of static or rotating channel flows in isothermal or forced convection regimes, show the applicability of such modelling for industrial studies.
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Submitted on : Friday, October 19, 2012 - 1:53:03 PM
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Benoît de Laage de Meux. Modélisation des écoulements turbulents en rotation et en présence de transferts thermiques par approche hybride RANS/LES zonale. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2012. Français. ⟨NNT : 2012ESMA0008⟩. ⟨tel-00743542⟩

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