Hi @fastwayjim, thanks for your response. I do see your point about the size of my air domain. That should be bigger than it currently is. Regarding the Temperature BC, I dont know if it has to be there either. I have run Natural Convection CFD analyses with other codes more forgiving than OpenFOAM and I did not have to specify a temperature on the Symmetry walls…
Thanks for running the simulations in the other software. I will definitely try increasing the size of my domain. I will also probably scale down the model. This is only a “for fun” experiment to see how SimScale handles huge meshes, but I also dont want to burn core hours as well.