Showing papers by "Jae Min Hyun published in 2002"

Enclosed Buoyant Convection With Internal Heat Generation Under Oscillating Sidewall Temperature

Abstract: A numerical study is made of buoyant convection in a square cavity with uniform internal heat generation q 0 "' Unsteady motions are generated by the imposition of time-periodic temperature at the right vertical sidewall, Θ = esin(ωτ) The temperature at the left sidewall is constant (Θ = 0) The Rayleigh number based on q 0 "' is large (10?≤Ra l ≤10 10 ), and the Prandtl number is 70 and e is moderate Numerical solutions to the governing balance equations are abtained The amplitude of the Nusselt number at the interior vertical lines, A(Nu*), shows two sharp peaks at the primary (ω r1 ) and secondary (ω r2 ) resonance frequencies The numerical data for resonance frequencies are in close agreement with the theoretical predictions based on internal gravity oscillations Details of flow- and temperature-field evolutions are depicted, and distinguishing features between the cases of ω r1 and ω r2 are scrutinized Descriptions are given of the intensification/decaying processes of the prevailing cell structures The extensive numerical exercises reinforce the assertion that resonance is expected when the external forcing frequency matches the modes of internal gravity oscillations Physical rationalizations are offered in the present context