Errors while running the simulation

somas123 · November 11, 2017, 00:28

I tried to run a simulation to analyse the effect of non condensable gases on wall condensation of steam in a containment. The simulation runs for around 50-60 time steps (0.01s each) and then gives errors. I've attached images of the same below. Could someone help me with their meaning?

ghorrocks · November 11, 2017, 05:28

FAQ: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F

Simulating the effects of non-condensable gasses on condensation of steam is a very challenging simulation to attempt. Only an expert in CFD is likely to succeed. If you are not familiar with overflow errors then I doubt you have sufficient experience in CFD and CFX to be successful at this simulation. Sorry for the blunt comment but it has to be said.

Maybe you should try some simpler simulations before tackling this extremely complex one?

somas123 · November 11, 2017, 05:37

Quote:

Originally Posted by ghorrocks

FAQ: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F

Simulating the effects of non-condensable gasses on condensation of steam is a very challenging simulation to attempt. Only an expert in CFD is likely to succeed. If you are not familiar with overflow errors then I doubt you have sufficient experience in CFD and CFX to be successful at this simulation. Sorry for the blunt comment but it has to be said.

Maybe you should try some simpler simulations before tackling this extremely complex one?

Hey, you are right. I am a beginner in CFD. I am working on this along with a PhD student. My task was to create the mesh for simulation. I have tried 3-4 different meshes but similar types of errors are occurring. Even the PhD guy hasn't been able to figure out the actual source of the errors. Hence I decided to post it here.

ghorrocks · November 11, 2017, 06:00

Well, the FAQ should help.

It is no surprise that is diverges. That is what complex simulations do. Working out what is required to stabilise them is the difficult bit. The FAQ describes the basics, but in your case if they don't work your problem may be much more complex. But start by making sure all the basics discussed in the FAQ have been checked.

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November 11, 2017, 05:28		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	FAQ: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F Simulating the effects of non-condensable gasses on condensation of steam is a very challenging simulation to attempt. Only an expert in CFD is likely to succeed. If you are not familiar with overflow errors then I doubt you have sufficient experience in CFD and CFX to be successful at this simulation. Sorry for the blunt comment but it has to be said. Maybe you should try some simpler simulations before tackling this extremely complex one?

November 11, 2017, 06:00		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,705 Rep Power: 143	Well, the FAQ should help. It is no surprise that is diverges. That is what complex simulations do. Working out what is required to stabilise them is the difficult bit. The FAQ describes the basics, but in your case if they don't work your problem may be much more complex. But start by making sure all the basics discussed in the FAQ have been checked.