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Anisotropic Organised Eddy Simulation for the prediction of non-equilibrium turbulent flows around bodies

Bourguet, Rémi and Braza, Marianna and Harran, Gilles and El Akoury, Rajaa Anisotropic Organised Eddy Simulation for the prediction of non-equilibrium turbulent flows around bodies. (2008) Journal of Fluids and Structures, 24 (8). 1240-1251. ISSN 0889-9746

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Official URL: http://dx.doi.org/10.1016/j.jfluidstructs.2008.07.004

Abstract

The unsteady turbulent flow around bodies at high Reynolds number is predicted by an anisotropic eddy-viscosity model in the context of the Organised Eddy Simulation (OES). A tensorial eddy-viscosity concept is developed to reinforce turbulent stress anisotropy, that is a crucial characteristic of non-equilibrium turbulence in the near-region. The theoretical aspects of the modelling are investigated by means of a phase-averaged PIV in the flow around a circular cylinder at Reynolds number 1.4×10^5. A pronounced stress–strain misalignment is quantified in the near-wake region of the detached flow, that is well captured by a tensorial eddy-viscosity concept. This is achieved by modelling the turbulence stress anisotropy tensor by its projection onto the principal matrices of the strain-rate tensor. Additional transport equations for the projection coefficients are derived from a second-order moment closure scheme. The modification of the turbulence length scale yielded by OES is used in the Detached Eddy Simulation hybrid approach. The detached turbulent flows around a NACA0012 airfoil (2-D) and a circular cylinder (3-D) are studied at Reynolds numbers 105 and 1.4×10^5, respectively. The results compared to experimental ones emphasise the predictive capabilities of the OES approach concerning the flow physics capture for turbulent unsteady flows around bodies at high Reynolds numbers.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found at Journal of Fluids and Structures website : http://www.sciencedirect.com/science/journal/08899746
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:14 Nov 2013 15:28

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