Assessment of Thermal Boundary Models for Large Eddy Simulations of Natural Convection
(2025) Flow, Turbulence and Combustion — Vol. 114, p. 117-144 (2025)
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- n this paper, we report on the efficacy of four different thermal boundary models for Wall-Modelled Large Eddy Simulations (WMLES) of turbulent natural convection. Our test cases consist of Rayleigh-Bénard convection of liquid water at two Rayleigh numbers, Ra=1.35x10^8 and Ra=10^9, respectively. Two configurations are examined, namely, convection in a box and in a cavity; the latter one involving a free-slip top boundary. For these test cases, the numerical results obtained via WMLES with the thermal boundary models are compared with those of Wall-Resolved Large-Eddy Simulations (WRLES). According to our comparative studies, a particular version of the so-called Kays \& Crawford model provides the most accurate predictions, at least for the test cases considered herein. Additionally, in this paper, we report on WMLES of turbulent convection at a higher Rayleigh number, $Ra=5x10^9, with the aforementioned model. For this case, we analyse herein the flow structure and present results for first and second-order statistics of the flow.
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Ceresiat, L., & Papalexandris, M. (2025). Assessment of Thermal Boundary Models for Large Eddy Simulations of Natural Convection. Flow, Turbulence and Combustion, 114, 117-144. https://doi.org/10.1007/s10494-024-00594-8 (Original work published 2025)