SIMULATION OF NATURAL CONVECTION IN OPEN ENDED ENCLOSURES BY LATTICE BOLTZMANN METHOD SRT MODEL
Keywords:Lattice Boltzmann Method, heat transfer, open ended enclosure, Rayleigh numbers
AbstractNatural convection in an open ended enclosure is simulated using Lattice Boltzmann Method (LBM). The paper is intended to address the physics of flow and heat transfer in open ended enclosures . The flow is induced into the enclosure by buoyancy force due to a heated vertical wall. Also, the paper demonstrated that open boundary conditions used at the opening of the enclosure is reliable, where the predicted results are similar to conventional CFD method (finite volume method, FVM) predictions. Prandtl number (Pr) is fixed to 0.71 (air) while Rayleigh numbers (Ra) and aspect ratios (A) of the cavity are changed in the range of 104 -105 and 0.5-1, respectively. It is found that the rate of heat transfer deceases asymptotically as the aspect ratio increases and may reach conduction limit for higher aspect ratio. The flow evaluation in the enclosure starts with recirculation inside the enclosure, as the time proceeds the flow inside the cavity communicates with the ambient.
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