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

Joao Marcelo Vedovoto
School of Mechanical Engineering Federal University of Uberlandia Uberlandia-MG, 38400-902 Brazil

Aristeu da Silveira Neto
School of Mechanical Engineering, Federal University of Uberlandia, Av. Joao Naves de Avila, 2121, Uberlandia, Minas Gerais, Brazil

Luis Fernando Figueira da Silva
Department of Mechanical Engineering Pontificia Universidade Catolica do Rio de Janeiro Rio de Janeiro-RJ, 22453-900 Brazil

Arnaud Mura
Institut Pprime - UPR 3346 - CNRS - ENSMA - Universite de Poitiers BP 40109, 86961 Futuroscope, France

Sinopsis

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.