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April 20, 2018, 05:05 |
Divergence due to gas properties.
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#1 |
New Member
Sprity Acharya
Join Date: Mar 2018
Posts: 3
Rep Power: 8 |
Hey everybody!
I have been working on gas flow through a pipe in Fluent. I vary the diameter of the pipe and compare the flow rates in this project. I was using air as the working material and got results. Now I switched to argon and fluent displays divergence detected in AMG solver: temperature. Can anybody give me hints on why it happens? I am using “ideal gas” as density and running the k-omega SST model. Thank you for any suggestions given. |
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April 20, 2018, 06:41 |
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#2 | |
Senior Member
Kushal Puri
Join Date: Nov 2013
Posts: 182
Rep Power: 12 |
Quote:
If it is velocity inlet try to run with mass flow inlet. |
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April 20, 2018, 06:53 |
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#3 |
New Member
Sprity Acharya
Join Date: Mar 2018
Posts: 3
Rep Power: 8 |
Hi!
I am using pressure inlet condition. It is a simulation of gas atomization process. I was able to get results till 4 mm of tube diameter. But i get divergence from 5 mm. thanks. |
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April 20, 2018, 11:34 |
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#4 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,741
Rep Power: 66 |
Check your boundary conditions. If you're using a turbulence model then also make sure you update the turbulent length scale or hydraulic diameter at inlets.
Check also your initial conditions. Don't respond with "i used calculate from." |
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April 20, 2018, 11:55 |
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#5 | |
New Member
Sprity Acharya
Join Date: Mar 2018
Posts: 3
Rep Power: 8 |
Quote:
My boundary conditions are working perfectly for air. When switched to argon, Fluent gives me results for smaller diameter. |
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April 21, 2018, 01:59 |
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#6 |
Member
Anonymous
Join Date: Mar 2014
Posts: 84
Rep Power: 12 |
What is the type of mesh you are using? Bad tets sometimes cause peaks and lows in temperature etc.
Try using constant density first, converge the flow then enable ideal gas density. Reducing relaxation factor for energy may also help. |
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Tags |
argon, divergence amg solver, k-omega sst model, temperature |
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