Home – Home – Jornals – Thermophysics and Aeromechanics 2011 number 1

A numerical analysis of turbulent regimes of the natural convection in a closed rectangular region with heat-conducting walls of finite thickness was carried out in the presence of a locally concentrated heat source under the conditions of the radiative-convective heat exchange with the ambient medium on one of the external boundaries. The mathematical model was constructed on the basis of the Reynolds equations in dimensionless variables stream function − vorticity vector − temperature. Special attention was paid to the investigation of the influence of the Grashof number 10^8<Gr<10^10, of the unsteadiness factor , and the thermal conductivity ratio a2,1=5.7*10^-4, 6.8*10^-5 on both the local and integral characteristics of the problem.