Two phase flow problem (long pipe) air/water - CFD Expert Help Please

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1

I am trying to learn Simscale to a deeper level. I have completed several models using two phase flow (mostly the tutorial problems). Now I created a model of a problem that I have sorted out in the real world to see if I could model it and come up with the same answer.

Short version is: a diversion pipe, large diameter, transitions from horizontal to 15% slope. In the process it entrains air in a specific flow range. The air causes flow restrictions further down the pipeline. Question to be answered is how much air needs to be vented at air release valves?

Problem: I can’t get the model to run, always getting an error “signal 8 encountered”. I have tried checking things and making adjustments, but just can’t figure out the problem. Maybe it is just too large?

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I could really use some input from someone with two phase flow experience.

Thanks in advance,
Stephan

2

Hey Stephan!

That could be related to the mesh quality, have you checked that already and (if I am correct with the assumption) made some changes to it accordingly? If I missed something related to the setup here, @cfd_squad feel free to jump in :slight_smile:

All the best!

Jousef

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Yes, thanks - I was concerned about that and tried a new mesh with no luck. This afternoon I deleted the model and I am trying to simplify it in Fusion 360 before I import a new one and try a new mesh. Will report here when I know more.

Thanks,
Stephan

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