Problem in a simple case

donfrulli · December 8, 2016, 11:33

Dear all,

I would like to make a simple simulation on air flow in a pipe with a restrictor. The simulation is not converging correctly and I got these errors:

Temperature corrections limited on 615 cells in Region
Minimum Temperature limited to 100 on 924 cells in Region
Turbulent viscosity limited on 13771 cells in Region

My continua settings are: gas, steady, segregated fluid temperature, ideal gas, k-epsilon turbulance. I'm not even sure what are the correct settings.
My experiment looks like this: I put 2 cylinders on each other and I put 4 CDs in between them. I generate a depression from below.

Any ideas what can be the problem?

Fiedde1887 · December 9, 2016, 08:32

Looks like a mesh-issue. Create a theshold for temperature for example and lokate the Region, where your solution have the unrealistic temperature. After that, you can fix your mesh.

donfrulli · December 9, 2016, 09:01

For now this indeed looks like a mesh issue because no matter what I did, STAR used trim mesh all the time (even when I set it to poly)
Thanks!

December 8, 2016, 11:33	Problem in a simple case	#1
donfrulli New Member Join Date: Sep 2016 Posts: 8 Rep Power: 10	Dear all, I would like to make a simple simulation on air flow in a pipe with a restrictor. The simulation is not converging correctly and I got these errors: Temperature corrections limited on 615 cells in Region Minimum Temperature limited to 100 on 924 cells in Region Turbulent viscosity limited on 13771 cells in Region My continua settings are: gas, steady, segregated fluid temperature, ideal gas, k-epsilon turbulance. I'm not even sure what are the correct settings. My experiment looks like this: I put 2 cylinders on each other and I put 4 CDs in between them. I generate a depression from below. Any ideas what can be the problem?

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December 9, 2016, 08:32		#2
Fiedde1887 Member Nils Hennig Join Date: Apr 2015 Posts: 44 Rep Power: 11	Looks like a mesh-issue. Create a theshold for temperature for example and lokate the Region, where your solution have the unrealistic temperature. After that, you can fix your mesh.

December 9, 2016, 09:01		#3
donfrulli New Member Join Date: Sep 2016 Posts: 8 Rep Power: 10	For now this indeed looks like a mesh issue because no matter what I did, STAR used trim mesh all the time (even when I set it to poly) Thanks!