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ADVANCED EDDY VISCOSITY TURBULENCE MODELLING - APPLICATION TO INERT AND REACTING BLUFF BODY FLOWS

Bart Merci
Department of Mechanics of Flow, Heat and Combustion, Ghent University, St-Pietersnieuwstraat 41, 9000 Gent; and Postdoctoral Fellow of the Fund of Scientific Research - Flanders,Belgium

Chris De Langhe
Dept. of Flow, Heat and Combustion Mechanics, Ghent University, St. Pietersnieuwstraat 41, B-9000 Gent, Belgium

Koen Lodefier
Dept. of Flow, Heat and Combustion Mechanics, Ghent University, St. Pietersnieuwstraat 41, B-9000 Gent, Belgium

Erik Dick
Dept. of Flow, Heat and Combustion Mechanics, University of Gent, St. Pietersnieuwstraat 41, 9000 Gent, Belgium

Resumo

The non-linear k − ε model by Merci et al. (2002a, 2002b, 2003a) is applied to inert and reacting bluff body flows (Dally, 1998). Based on observed shortcomings in the results, the turbulence model is adjusted without deteriorating previous results. The obtained improvements for the bluff body flows are, however, rather limited. Probably, the flows, which are strongly unsteady in reality, are too complex for any two-equation turbulence model to yield satisfactory results throughout the domain. An unsteady calculation seems necessary (TNF, 2003a).