ISSN Online: 2377-424X
ISBN Print: 0-85295-345-3
International Heat Transfer Conference 10
A DIRECT NUMERICAL SIMULATION OF HEATED FLOW TRANSITION IN A VERTICAL CHANNEL
要約
This research seeks to increase our understanding of the fluid mechanics and heat transfer phenomena in transitional mixed convection flows between two heated vertical plates. A direct numerical simulation by the spectral method with weak formulation is used to solve the transient 3-D Navier-Stokes equations and energy equation. Initial disturbances consist of the finite-amplitude 2-D wave and two 3-D oblique waves for both the velocity and the temperature fields. Disturbance competitions among different modes during transition were shown for different sets of dimensionless parameters. The heat transfer was found to enhance the instability and breakdown of the large-scale vortex structure. The transition is hastened for higher Reynolds and Rayleigh numbers.