[rico_luethi]

Hello together

I am simulating a hot water tank which is located in a lake. A picture of the setup is attached. The water in the tank is at rest (no flow) and under normal pressure. The lake has a current of 0.1 - 0.5 m/s. The important thing for me is the heat dissipation of the storage tank (heat transfer through the insulation) and the temperature distribution in the storage tank.

I only have a laptop at my disposal, which does not have a lot of computing power and only has limited time. Which flow model should I use so that my computer is not completely overloaded?

My mesh has approx. 700,000 elements, I should carry out a transient simulation.

Can I use the k-epsilon model or is there a more efficient method?

And with regard to the Courant number: What is the maximum number that can be used?

I hope one of you can help me. Please let me know if you have any questions.

Kind Regards
Rico Lüthi