I would like to ask you for a reference for simulating one tube of a solar collector in ANSYS. I will attach a model of the tube I'm trying to simulate. In fact I would like to do what is depicted in the following article, but I do not know how I can do it. Please, I hope you can help me.
https://www.dropbox.com/s/a2mzwjfxd68oigr/brazil-2014ugm-evaluation-of-natural-convection-in-tube-solar-collector.pdf?dl=0