natural convection in a square enclosure with a partial dividing wall
 

Hi, I am modelling a problem of natural convection in a square enclosure with a partial dividing wall, i am using the fluent package. What precautions should i check so that the solution converges fast?? Also do i need to specify a boundary condition for the partial dividing wall (attached to a wall of the square and perpendicular to it, 2d problem). I would appreciate any help on this matter as well as suggestions. Thanks sandeep