Numerical simulation of thermal convection in a rectangular duct flow
Abstract
Numerical simulation of thermal convection in a horizontal rectangular duct flow heated from both bottom and sides is carried out using a method based on the Fourier spectral method. It is shown that the convective secondary flow is induced not only by the RayleighBenard instability but by the natural convection near the duct's side walls. As a result, almost stationary longitudinal convective rolls are achieved in the flow when the Reynolds numbers are large values, 500 and 220. On the other hand, when the Reynolds number is a smaller value, 90, the rolls fluctuate chaotically in space and time; then the time averaged secondary flow is almost vanishing and the fluid temperature widely constant in the central part of the duct.
 Publication:

8th NAL Symposium on Aircraft Computational Aerodynamics
 Pub Date:
 November 1990
 Bibcode:
 1990acae.proc..209Y
 Keywords:

 Convective Flow;
 Convective Heat Transfer;
 Ducted Flow;
 Flow Distribution;
 RayleighBenard Convection;
 Secondary Flow;
 Computational Fluid Dynamics;
 Computerized Simulation;
 Free Convection;
 Reynolds Number;
 SpaceTime Functions;
 Spectra;
 Wall Flow;
 Fluid Mechanics and Heat Transfer