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Could you attach an image or two of the simulation model/domain with the desired boundary conditions?Is the rectangular frame (is that what you also refer to as pipe?) completely closed - so the air is completely captured with no inlets/outlets?
I created a demo model - using the just-released HyperWorks CFD 2022.1. I've attached that database, along with a results animation. This has two volumes - a steel enclosure and the fluid volume inside it. The bottom of the steel enclosure has a defined temperature, and the other outer surfaces have a convective heat flux coefficient with reference temperature. The air inside has a Boussinesq density - such that it can change with temperature.
As with many (or most) natural convection flows, there is no steady-state solution, so this is set to run transient.
This is what my model looks like. Air inside the frame is what I am facing issue with.(how to model convection in air)
That's pretty much what the example attached earlier does - except it only has one surface with a defined temperature. What have you tried so far - using that example as a guide? Do you have access to HyperWorks CFD 2022.1 - to open that model?
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