I am doing my project on "cooling of heat flux surface using slot-jet", i am doing for different richardson numbers in order to analyse effects of richardson number on heat trasnfer charaterstics. and also for different aspect ratios.While solving problem when boussnique approximation is not applied i am getting.when it is applied it is giving some other values,the nature of graphs is decreasing-increasing curve.But actuall graph must be only decreasing.I am solving using "COUPLED SOLVER". this is for laminar.Can any one tell how to solve this problem using fluent.It is confined slot-jet Boundary Condtions are: outlet :constant pressure. symmetry condition.

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