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 x 10^9. 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.

Comparison between RANS and LES approaches to the simulation of natural convection in a differentially heated square cavity

PACHERA, MATTEO;BRUNELLO, PIERFRANCESCO;RACITI CASTELLI, MARCO
2014

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 x 10^9. 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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3179902
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