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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Large Eddy Simulation of Heat Transfer in Boundary Layer and Backstep Flow Using PANS

pages 216-227
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.250
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ABSTRAKT

Developing boundary layer flow and the flow over a backward-facing step are studied here. The LRN PANS k−ε [1] and the WALE turbulence model [2] are used as SGS models. The PANS (Partially Averaged- Navier-Stokes) modelling approach [3, 4] is a modified k−ε model that can operate in both RANS and LES mode. An extension of PANS based on a four-equation k−ε−ζ−f model was recently proposed [5]. Synthetic, anisotropic, turbulent fluctuations are prescribed at the inlet to trigger the momentum equations into turbulenceresolving mode. The effect of the amplitude of the synthetic fluctuations is investigated. Different values of fk are used. Two different discretization approaches are compared: 100% central differencing (CDS) or 95% CDS and 5% van Leer second-order bounded upwinding scheme. One 2D RANS simulation using the k−ω SST model is made for the backstep flow. A detailed comparison is made between 2D RANS and PANS including an analysis of the balancing terms in the momentum and temperature equations.

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