Abstract
A numerical study has been made on combined forced and natural convection around a porous square cylinder which is heated uniformly. Buoyancy caused by the heating induces a significant change in the flow pattern. With increase in the amount of heating, the structure of the vortex in the wake is changed to a steady twin vortex from unsteady Karman vortex and the 'oscillatory motion is suppressed. A further increase in the amount of heating reduces the length of the twin vortex. Moreover, the drag coefficient of the porous square cylinder increases with the increases of the amount of heating.
