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Article Dans Une Revue Physics of Fluids Année : 2024

Dynamics of turbulent natural convection in a cubic cavity with centrally placed partially heated inner obstacle

Résumé

Natural convection in a cavity with a partially heated obstacle at the centre at the Rayleigh number Ra = 1.46 × 10 9 is investigated using large-eddy simulation (LES). The standard and dynamic Smagorinsky models, as well as the Wall adapting local eddy-viscosity (WALE) model, are used for the sub-grid scales, and the flow statistics are compared with recent experiments. The LES results obtained with different meshes show overall good agreement with the experiments as concerns the flow and heat transfer. Simulation with a non-ideal wall at the adiabatic side of the obstacle is also performed to explain the residual discrepancies observed in the unheated channel. Additional simulations performed with periodic conditions in the spanwise direction are very different from the full three-dimensional (3D) simulations, which demonstrates the significance of 3D effects in the cavity. In particular, periodic simulations show Tollmien-Schlichting kind waves in the transitional region, while the 3D cavity shows an early cross-flow transition to turbulence.
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Dates et versions

hal-04652604 , version 1 (18-07-2024)

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  • HAL Id : hal-04652604 , version 1

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Sofen Kumar Jena, Remi Manceau. Dynamics of turbulent natural convection in a cubic cavity with centrally placed partially heated inner obstacle. Physics of Fluids, inPress. ⟨hal-04652604⟩
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