There is some asymmetry in the velocity profile but does not
appear significant. Since we are interested in overall thermal
behaviour, a symmetric parabolic profile was taken to approximate
the velocity profile and the simulations were performed. For the
ease of computation a 20 sector with one secondary air inlet
was simulated assuming symmetry and a parabolic velocity profile
was assumed for air inlets. The computational domain along with
the boundary conditions used are shown in Fig. 6.