[kaazto28]

Originally Posted by Tapeworm

Would really appreciate some input in what might be happening here:

I was running the simulation and it seemed stable. The process is expected to take approximately 7200 seconds to finish. The melting process starts after ~200-300 seconds. The pictures included is from the FLUENT log at the flow time of 1363s - 1365s. During these few seconds, the simulation totally diverges and it can't seem to be recovered. Any suggestions on what can cause this or how to avoid this situation?

I mean, there is no new critical process happening in the model. I would understand if it was during these few seconds that the PCM starts to melt or something, then the calculations may be more complex and the simulation diverges. But looking at the results files during the seconds before this divergence, it behaves just the same as previously (from the start).

Any hints?

Thanks!

picture 4, The blue is inlet, is it? can you give me residual graphic (your tutorial 24000 iteration)?

Is your simulate 7200 second (12 minute)?

Can you set adaptive-timestep for my tutorial for 20 minutes? If I just make the 7200second 12000 second , would it be enough? https://ibb.co/kYA4wQ

[Tapeworm]

Another question.
Regarding the pressure in the PCM, how should one consider the pressure when working with solidification/melting problems? Should it be constant in the PCM? If not, could the volume expansion cause a problem if the volume exceeds the domain volume of the PCM, or does ANSYS compensate for that some how?

[Tapeworm]

So, I finally managed to get the simulations going without problems and got decent conveyance.
For the results now, any suggestion on what is the easiest way to calculate the energy transferred between the HTF and PCM?

Ty!