Towards practical large-eddy simulations of complex turbulent flows

Jérôme Boudet (1) , Adrien Cahuzac (1) , Pierre Borgnat (2) , Emmanuel Lévêque (2) , Federico Toschi (3)

1 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
2 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
3 Technische Universiteit Eindhoven

A Shear-Improved Smagorinsky model (SISM) allowing to address non-homogeneous and unsteady flow configurations in a physically-sound manner, without adding significant complication and computation compared to the standard Smagorinsky model, is studied and implemented. Interestingly, the SISM does not call for any adjustable parameter nor ad-hoc damping function. It makes use here of an exponential smoothing algorithm to estimate the ensemble-average of the strain from the temporal evolution of the flow. Application on a flow past a circular cylinder is used as a test of the method.

Keywords: Large Eddy Simulation; Shear-Improved Smagorinsky model; Exponential Smoothing

Domains: Physics [physics]; Mechanics [physics]; Fluid mechanics [physics.class-ph]; Engineering Sciences [physics]; Mechanics [physics.med-ph]; Fluids mechanics [physics.class-ph]; Computer Science [cs]; Signal and Image Processing; Engineering Sciences [physics]; Signal and Image processing

Jérôme Boudet, Adrien Cahuzac, Pierre Borgnat, Emmanuel Lévêque, Federico Toschi. Towards practical large-eddy simulations of complex turbulent flows. 12th EUROMECH European Turbulence Conference, Sep 2009, Marburg, Germany. ⟨ensl-00420589⟩