In order to investigate the viscoelastic effect on classical thermal convective system-Rayleigh-Bénard convection (RBC), this paper uses direct numerical simulation to study the RBC system with viscoelastic fluid. By comparing the instantaneous velocity vector and temperature between Newtonian fluid and viscoelastic fluid cases, it is found that under certain conditions viscoelastic fluid has delayed the generation of RBC. Besides, the addition of viscoelastic fluid can enhance heat transfer based on Nusselt number and the heat transfer mechanism is interpreted based on the thickness of moment and temperature boundary layers.
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