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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.v1.i4.20
pages 385-403

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

David F. Fletcher
School of Chemical and Biomolecular Engineering, The University of Sydney, Australia
Paul E. Geyer
School of Chemical and Biomolecular Engineering, University of Sydney,
Brian S. Haynes
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia

RÉSUMÉ

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 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 therefore 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 data from the literature 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 pressure-driven secondary flows and their impact on subsequent heat transfer predictions. The results show only minor differences between the predictions of the shear stress transport model and the omega-based Reynolds stress model.


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