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Numerical Study of Natural Convection Coupled to Gas Radiation in a Cavity Containing an Active Obstacle

Abstract : Our objective is to study numerically natural convection flows in an enclosure,the fluid being a gaseous mixture including absorbent components (CO2, H2O). For this purpose, we consider a cubic cavity with a source located on the floor, heating the fluid and diffusing a pollutant participating to radiation. Our calculations are performed with the CFD software Code Saturne, in which we have implemented our own data for the discrete ordinates method (new quadratures) and for modelling gas radiation (SLW method in the rank-correlated approach). In pure thermal natural convection, the results show that gas radiation slightly changes the flow structure and the temperature distribution. It reduces the convective exchanges between the fluid and the walls of the enclosure as well as the radiative exchange between the upper surface of the obstacle and the cavity boundaries. In double diffusion, in the aiding case, gas radiation tends to homogenize the thermal field and slightly accelerates the parietal boundary layers, but reduces the maximum velocity within the plume. On the other hand, it has little effect on the concentration field. In the opposing case, the radiation intensifies the thermal plume above the obstacle. It reduces the temperature in regions close to the vertical surfaces of the obstacle. The concentration field shows the same modification trends as the thermal field.
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Submitted on : Thursday, December 17, 2020 - 9:41:39 AM
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  • HAL Id : tel-03079090, version 1

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Xuan Bach Nguyen Le. Numerical Study of Natural Convection Coupled to Gas Radiation in a Cavity Containing an Active Obstacle. Other. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2020. English. ⟨NNT : 2020ESMA0014⟩. ⟨tel-03079090⟩

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