Very High Co number in interFoam

anubasu · February 11, 2024, 10:04

Hi all,
I refined a mesh in a geometry and then it started reaching very high Co of 1e+40 and the simulation is failing. I have reduced the time-step to 1e-10 and switched on adjusttimestep with a max Co .25, but still the Co is reaching very high values and the simulation is failing. I have checked the mesh, it seems fine with a min edge length of 1e-3. Should i try something else? like schemes or relaxation factors? or should i check my mesh first, i created the mesh in ansys using multizone. It will be very helpful if someone can provide insght. Many Thanks.

Ani

Severus · February 16, 2024, 12:22

Hello,
There could be many reasons. You have not given much information.

Could you post here the output of checkMesh?

Then what are the fvSchemes and fvSolutions?

By looking into these, we can get a better idea.

Thanks

February 11, 2024, 10:04	Very High Co number in interFoam	#1
anubasu Member Anurag Join Date: Feb 2023 Posts: 69 Rep Power: 3	Hi all, I refined a mesh in a geometry and then it started reaching very high Co of 1e+40 and the simulation is failing. I have reduced the time-step to 1e-10 and switched on adjusttimestep with a max Co .25, but still the Co is reaching very high values and the simulation is failing. I have checked the mesh, it seems fine with a min edge length of 1e-3. Should i try something else? like schemes or relaxation factors? or should i check my mesh first, i created the mesh in ansys using multizone. It will be very helpful if someone can provide insght. Many Thanks. Ani

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February 16, 2024, 12:22		#2
Severus Member Shravan Join Date: Mar 2017 Posts: 63 Rep Power: 9	Hello, There could be many reasons. You have not given much information. Could you post here the output of checkMesh? Then what are the fvSchemes and fvSolutions? By looking into these, we can get a better idea. Thanks