I have successfully run conjugate heat transfer cases in the past but now I am trying to simulate 3 U shaped heating elements in a body of water using conjugate heat transfer and the simulation returns an error every time (it just says error without giving more information). I have set the heat elements as absolute power sources. As for other conditions, I’ve tried leaving the external walls without boundary conditions, tried using wall heat transfer boundaries on the external walls, tried using zero temperature gradient on the external walls, tried changing mesh density, using a turbulence model and even manually defined the contact between the heating elements and fluid (even though the mesh log said they were resolved successfully) but nothing seems to work. The error always comes up very early on in the run. In the log it says ”error::printStack(Foam::Ostream&)” which according to google may be a division by zero error.
Project link https://www.simscale.com/projects/roy_g/heater/
I am considering trying to alter the CAD model so that the heating elements are completely covered by the water but I am not sure why it should be an issue if they are not covered, as long as they have the right boundary conditions.