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REFINED EDDY VISCOSITY SCHEMES AND LARGE EDDY SIMULATIONS FOR ASCENDING MIXED CONVECTION FLOWS

DOI: 10.1615/ICHMT.2008.CHT.2410
22 pages

Amir Keshmiri
School of Mechanical, Aerospace and Civil Engineering (MACE), The University of Manchester, Manchester M60 1QD, U.K.

Yacine Addad
The University of Manchester, School of Mechanical, Aerospace and Civil Eng., M60 1QD, UK; The University of Khalifa, Nuclear Engineering, P.O. Box 127788, Abu Dhabi, U.A.E.

Mark A. Cotton
Turbulence Mechanics Group, School of Mechanical, Aerospace and Civil Engineering. The University of Manchester, Manchester M13 9PL, U.K.

Dominique R. Laurence
Modelling and Simulation Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK; EDF R&D, Fluid mechanics, Energy and Environment, 78401 Chatou, France

Flavien Billard
School of Mechanical, Aerospace and Civil Engineering (MACE), The University of Manchester, Manchester M60 1QD, U.K.; and EDFR&DMFEE Department, 6 quai Watier, 78401 Chatou Cedex, France

要約

The present work is concerned with the modelling of ascending turbulent (‘mixed convection’) flow in a vertical heated pipe. All fluid properties are assumed to be constant and buoyancy is accounted for within the Boussinesq approximation. Four Eddy Viscosity Models (EVMs) are examined against experimental measurements and the direct numerical simulation data of You et al. [2003]. The EVMs embody distinct physical refinements with respect to the parent high-Reynolds-number k-ε model. Large Eddy Simulations (LES) employing the classical Smagorinsky sub-grid-scale model are also presented. Three different CFD codes have been employed in the study: ‘CONVERT’, ‘Code_Saturn’, and ‘STAR-CD’, which are respectively in-house, industrial, and commercial packages. In relation to forced convection Nusselt number and local friction coefficient, discrepancies are identified between ‘reference’ data sources, namely earlier DNS and experimental results and the present LES computations. The Launder-Sharma closure [Launder and Sharma, 1974] is in the closest agreement with DNS results for levels of heat transfer impairment in ascending mixed convection flow, although again there is a lack of consensus between reference sources.

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