[mojtaba.safdari.ms@gmail.]

i have a transient problem. in which a turbulence air flow passes around a phase change material which is wrapped around a heater. i just want to solve energy equation for my phase change material zone because it takes too long for computation if i solve flow equations for this part and also i get floating point in seconds after pcm starts melting.
i wonder if s/o could help me.
thank you

[LuckyTran]

You can't skip solving only the flow equations in only 1 cell zone. You can however, skip solving the flow equations across any/all zones. Just go solution=>controls=>equations (or just solution controls in earlier versions), it's the same place where you specify under-relaxation factors. You can deselect Flow (you should also deselect turbulence) and keep only the energy selected.

[mojtaba.safdari.ms@gmail.]

Originally Posted by LuckyTran

You can't skip solving only the flow equations in only 1 cell zone. You can however, skip solving the flow equations across any/all zones. Just go solution=>controls=>equations (or just solution controls in earlier versions), it's the same place where you specify under-relaxation factors. You can deselect Flow (you should also deselect turbulence) and keep only the energy selected.

So what should i do?I always get floating point error simulating melting process. i cant skip flow eqs. because the heat transfer between pcm and air flow is important for me.Do you have any suggestion for me?

[AlexanderZ]

most likely the problem comes from material properties

best regards

[yogesh03y]

Hi, did you figure out a way to solve this issue? I am solving a similar problem. I'm trying to simulate a transient heat discharge from a phase change material (PCM) to air flowing in a channel below it. I am interested in the temperature dependent variations in the flow field. So the flow solution of air is required. For the PCM, only the temperature and liquid fraction are of interest.



Thanks!