Dear Sir/ Madam,
I need your assistance, please.
I see the following error message after run calculation of ANSYS-Fluent.
“Divergence detected in AMG solver: temperature”
How can I overcome this problem, please?
Regards,
Ahmed Alkaisi
Hi,
There are multiple explanations for this kind of error message.
You should first carefully check your simulation setup in terms of models and boundary conditions. If this is the case, I guess you would probably see the error occurrence in the simulation first steps.
After you guarantee everything is physically consistent, you can try to use classical numerical stabilization techniques, such as reducing the time step, use smooth ramp functions for boundary conditions, reduce under-relaxation factors (maybe increasing the maximum iteration number). Check out the manual for specific recommendations based on the models you are using.
Another good thing to do is to plot the simulation residuals and verify if you can localize the source of error (it always can be related with a poor quality mesh).
Good luck!
Daniel
Hi,
There are multiple explanations for this kind of error message.
You should first carefully check your simulation setup in terms of models and boundary conditions. If this is the case, I guess you would probably see the error occurrence in the simulation first steps.
After you guarantee everything is physically consistent, you can try to use classical numerical stabilization techniques, such as reducing the time step, use smooth ramp functions for boundary conditions, reduce under-relaxation factors (maybe increasing the maximum iteration number). Check out the manual for specific recommendations based on the models you are using.
Another good thing to do is to plot the simulation residuals and verify if you can localize the source of error (it always can be related with a poor quality mesh).
Good luck!
Daniel
Thank you, Mr Daniel
I'm working on fluent solver ANSYS 17.1
I have transient multiphase VOF with solar tray to simulate evaporation-condensation problem.
Regards
Hi,
According to your question, there are one conditions that occur to me.
If your choose parallel simulation，you can try to choose serial simulation instead it, which may solve your problem.
Beside, if there are many simulation in your computor at same time, you can shut down some of them.
Good luck！
All above answers are related and give a good suggestion. My suggestion is to read more about it. Because every case has different reasons. After reading you may find the reason that cause this error in ( Algebraical Multi-Grid ).
Link : http://www.cfd-online.com/Forums/fluent/38074-divergence-detected-amg-solver-temperature.html
Link : Please read previous threads about this on Research Gate.
link: Attached File
Regards
decrease the time step.
or change the solution technique.
mesh should be fine
c.n should be less
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