Hi,

I'm trying to model 2D laminar free convection on a vertical flat plate.

- My domain is 1m(height)x 10m(width)

- Isothermal wall on the left boundary where the heating starts 1/3 of the way up the wall

- Symmetry on the right boundary, pressure outlet and inlet on the top and bottom respectively

- incompressible ideal gas model for variable density

- body force weighted solver

My problem is in my results. The buoyant flow is there, however there is a small, but noticeable downflow throughout the domain. When I compare the pressures across the inlet and outlet, there is a significant difference which seems to be driving this downward flow, even though I had set them both to be constant at 0 Pa.

Is there something I am missing in setting up the pressure boundary conditions?

Try switching on Operating density (Define->Operating Conditions), and set Operating density by value of density of ambient flow.

Thanks for your response

I tried as you said to change the operating density to the ambient value but it seems to have had no effect in terms of reducing the downward flow

[Navid450]

Have you solved your problem?