Is it accuracy to simulate the transient performance of natural convection inside an air duct without putting the duct in a large environment domain in Ansys Fluent? The square duct is vertical sitting and has pressure inlet and outlet. It use boussinesq approximation for air flow as temperature difference is small.Fixed heat flux is applied to one side of duct. The case is like Trombe wall. Many Thanks!
As far as you using correct pressure boundary conditions. Also, you should notice that flow may reverse its direction, then at the boundary you should use correct temperature boundary condition. If the flow in, then T=Tambient, if flow out, usually good to assume that the temperature gradient is zero, see my publications on natural convection with open boundaries...
@Abdulmajeed Mohamad Thank you so much for your reply. I know there is pressure and temperature difference between inlet and outlet, however, the difference is very small in natural air convection. I have tired several times as I used same pressure and temperature at inlet and outlet in Fluent, the result seems reasonable and continuity is also converged. So I wonder if the result is accuracy?
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