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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

NUMERICAL SIMULATIONS OF TURBULENT REACTIVE FLOWS USING A HYBRID LES / PDF METHODOLOGY

pages 1-6
DOI: 10.1615/TSFP8.1220
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RESUMO

Time-resolved numerical simulations of fluid flows, such as Large Eddy Simulations (LES), have the capability of simulating the unsteady dynamic of large scale energetic structures. However, they are known to be intrinsically sensitive to inflow conditions the modelling of which may become a crucial ingredient of the computational model. The present work reports LES of both reactive and non reactive turbulent channel flows of methane/air mixtures. The flow configuration and associated conditions correspond to those associated with a reference experimental database that has been obtained at the french aerospace Laboratory of Onera. The focus of our study is placed on the influence of synthetic inlet turbulence in this experimental configuration, and the principal aim is to investigate the sensitivity of the flow dynamics and mixing to inflow conditions. This sensitivity is illustrated for four distinct turbulent inflows obtained from white noise, digital filters, the random flow generator (RFG), and synthetic eddy model (SEM). Finally the results obtained for reactive flow conditions clearly emphasize the influence of the retained model on the chemical reaction rate statistics. This highlights confirms how relevant are the developments devoted to synthetic turbulence for the computational investigation of turbulent combustion.

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