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Simulation numérique pour l'aérothermique avec des modèles sous-maille

Abstract : Large-Eddy simulations of the turbulent channel flow ( representative case of internal flows in equilibrium ) and the turbulent flow past a backward-facing step ( representative case of separated flows ) have been performed to study the heat transfer for a quasi-incompressible flow. The Boussinesq equations are solved on a non-staggered grid with the use of an hybrid finite difference / finite element scheme which prevents wiggles. The time integration is performed with an Adams/Bashforth scheme and a backward differenciation formulae. In order to maintain a constant bulk velocity and bulk temperature in the turbulent channel flow simulation, a pressure gradient and a temperature source term, both varying in time, are added to the equations. In order to obtain the turbulent unsteady dynamical and thermal fields at the inflow of the backward-facing step, an original coupling is carried out with a previous turbulent channel flow simulation. Several self-adaptative models for the Subgrid-Scale Reynolds tensor are presented. For the Subgrid-Scale heat flux, two new Subgrid-Scale models and several different classical models are described. All these Subgrid-Scale models are tested in a turbulent channel flow and compared with direct simulation. For the turbulent flow past a backward-facing step, only one Subgrig-Scale model has been used for the Subgrid-Scale Reynolds tensor and heat flux.
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Contributor : Emmanuel Montreuil Connect in order to contact the contributor
Submitted on : Friday, October 28, 2005 - 12:19:05 PM
Last modification on : Wednesday, December 9, 2020 - 3:11:27 PM
Long-term archiving on: : Friday, September 14, 2012 - 3:45:11 PM


  • HAL Id : tel-00010815, version 1


Emmanuel Montreuil. Simulation numérique pour l'aérothermique avec des modèles sous-maille. Mécanique []. Université Pierre et Marie Curie - Paris VI, 2000. Français. ⟨tel-00010815⟩



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