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ASSESSMENT OF THE SST AND OMEGA-BASED REYNOLDS STRESS MODELS FOR THE PREDICTION OF FLOW AND HEAT TRANSFER IN A SQUARE-SECTION U-BEND

DOI: 10.1615/ICHMT.2008.CHT.380
16 pages

Paul E. Geyer
School of Chemical and Biomolecular Engineering, University of Sydney,

David F. Fletcher
School of Chemical and Biomolecular Engineering, The University of Sydney, Australia

Brian S. Haynes
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia

Abstract

The simulation of flow and heat transfer at a U-bend of a square-section duct is used to test the performance of two turbulence models: the Shear Stress Transport (SST) model and an omega-based Reynolds stress model. In both cases a sufficiently fine computational mesh is used such that the models are integrated to the wall and no wall function treatment is used. All simulations are performed using ANSYS CFX. The models are initially tested for fully-developed flow and heat transfer in straight ducts and are shown to agree well with accepted correlation data. Comparisons with literature data are made for both the flow field and the wall heat transfer coefficient. Particular attention is given to an assessment of the ability of the models to predict the secondary flows and their impact on subsequent heat transfer predictions. The results show only minor differences between the predictions of the SST and the omega-based Reynolds stress model.

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