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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Numerical and Physical Aspects in LES and Hybrid LES/RANS of Turbulent Flow Separation in a 3-D Diffuser

page 10
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1740
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ABSTRACT

An incompressible fully-developed duct flow expanding into a diffuser whose upper and one side walls are appropriately deflected (with the expansion angles of 11.3° and 2.56° respectively, Fig. 1), for which the experimentally obtained reference database was provided by Cherry et al. (2008, 2009), was studied computationally by using LES (Large Eddy Simulation) and DES (Detached Eddy Simulation) methods. In addition, a zonal Hybrid LES/RANS (HLR; RANS − Reynolds-Averaged Navier Stokes) method, proposed recently by Jakirlic et al. (2006, 2009) and Kniesner (2008), has been applied. The flow Reynolds number based on the height of the inlet channel is Reh=10000. The primary objective of the present investigation was the comparative assessment of the afore-mentioned computational models in this flow configuration characterized by a complex three-dimensional flow separation being the consequence of an adverse pressure gradient evoked by the duct expansion. The focus of the investigation was on the capability of the different modelling approaches to accurately capture the size and shape of the three-dimensional flow separation pattern and associated mean flow and turbulence features.

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