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Turbulent Natural Convection in Horizontal Coaxial Cylindrical Enclosures: LES and RANS Models

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1050
pages 507-510

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.

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

M. Rabbitt
Nuclear Generation, EDF Energy Barnwood, Glos. GL4 3RS, UK

Abstract

Numerical investigations of turbulent natural convection between concentric, cylinders has been carried out. Large Eddy Simulations (LES) have been performed on three different geometries. The first two consider a single inner cylinder at gap-based Rayleigh numbers of 1.18×109 and 2.38×1010 and an aspect ratios Ro/Ri=4.87 and 3.37, respectively. The last LES run considers three internal cylinders. It reveals that the flow patterns in the decay heat pen are more complex than the one internal concentric cylinder cases. The two-equations RANS models predictions for this test case are less satisfactory than in the simplified test cases, while second moment closure results are closer to the LES predictions.

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