WSEAS Transactions on Heat and Mass Transfer
Print ISSN: 1790-5044, E-ISSN: 2224-3461
Volume 9, 2014
Comparison between RANS and LES Approaches to the Simulation of Natural Convection in a Differentially Heated Square Cavity
Authors: , ,
Abstract: The capabilities of Fire Dynamics Simulator (FDS), a LES code for fire dynamics assessment, to correctly predict also a buoyancy driven flow in a small square cavity are discussed and compared with the results of a well established CFD solver (Ansys Fluent). In both cases, numerical predictions are compared with a detailed experimental benchmark available in the literature, where the flow field in a 0.75 m high, 0.75 m wide and 1.5 m deep cavity was extensively measured. Both the hot wall of the cavity and the cold one were isothermal (respectively at 50 C and 10 C), giving a Rayleigh number of 1:58 109. A quite remarkable agreement between numerical and experimental data is obtained using Ansys Fluent, while new values of the coefficients for natural convection in FDS are hereby proposed, allowing a significant improvement of the capabilities of the code to reproduce the experimental heat transfer.
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Pages: 261-269
WSEAS Transactions on Heat and Mass Transfer, ISSN / E-ISSN: 1790-5044 / 2224-3461, Volume 9, 2014, Art. #23