Rayleigh–Bénard convection in a cubic cell under the effects of gas radiation up to Ra=1E9

نویسندگان

چکیده

• DNS of coupled radiation and Rayleigh–Bénard convection in a cubic cell are performed the range 10 3 ? Ra 9 for an air/H 2 O/CO mixture. Radiative transfer delays onset but promotes increases kinetic energy flow from ? 5 . Specific contributions radiative to potential balance thermal highlighted. Second order turbulence statistics analysed 7 This paper investigates effects on over large Rayleigh numbers, = (below convection) turbulent regime. Coupled direct numerical simulations carried out radiating mixture at room temperature, using Chebyshev spectral method ray-tracing field. For highest subgrid model is used account smallest, non-optically thin, scales. Symmetry time-averaging (for unsteady solutions) applied compare uncoupled results, regardless multiple configurations that may be obtained. At low number, decreases, delayed when taken into account. However, once settles, with radiation, leading higher convective flux core energy. It also shown ratio source terms roughly scales as ? 1 / weaken high numbers. Finally, budgets mechanical fluctuations ? The magnitude each term these stronger dissipation has little influence temperature fluctuation budget.

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ژورنال

عنوان ژورنال: International Journal of Heat and Mass Transfer

سال: 2022

ISSN: ['1879-2189', '0017-9310']

DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2021.122453