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Maximum number of Newton iterations reached

Posted Feb 27, 2020, 5:49 a.m. EST Version 5.4 4 Replies

Nico Ardian
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Good day,

I am having this error after inputing a new function into the model. The new fucntion I inputied is the equation of density of CO2, which represent real gas condition, since what COMSOL has is CO2 ideal gas. Could someone help me finding out what is the problem?

Best regards, Nico

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4 Replies Last Post Mar 2, 2020, 5:02 a.m. EST
Alexandre Arsenault
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Posted: 5 years ago Feb 27, 2020, 9:21 a.m. EST
Updated: 5 years ago Feb 27, 2020, 3:19 p.m. EST

Hi Nico,

You can increase the number of Newton iterations under "Study->Solver Configurations->Solver->Time-Dependent Solver->Fully Coupled". I usually set the maximum number of iterations to 25 and it works.

Cheers,

Alex

Hi Nico, You can increase the number of Newton iterations under "Study->Solver Configurations->Solver->Time-Dependent Solver->Fully Coupled". I usually set the maximum number of iterations to 25 and it works. Cheers, Alex
Nico Ardian
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Posted: 5 years ago Feb 28, 2020, 3:29 a.m. EST

Thynk you for your answer,

I actually did that, however the simulation did not work. Not only increasing the iterations number, changging jacobian did not also help.

Best regards,

Nico

Thynk you for your answer, I actually did that, however the simulation did not work. Not only increasing the iterations number, changging jacobian did not also help. Best regards, Nico
Alexandre Arsenault
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Posted: 5 years ago Feb 28, 2020, 10:14 a.m. EST

Are you using a fully coupled solver? If so, you can try to change the nonlinear method to Automatic or Automatic Highly Nonlinear, which will slow down the simulation, but can help with nonlinear problems.

Cheers,

Alex

Are you using a fully coupled solver? If so, you can try to change the nonlinear method to Automatic or Automatic Highly Nonlinear, which will slow down the simulation, but can help with nonlinear problems. Cheers, Alex
Nico Ardian
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Posted: 5 years ago Mar 2, 2020, 5:02 a.m. EST

Thank you for the answer. I have also tried that method, but still didnt work at all.

Best regards,

Nico

Thank you for the answer. I have also tried that method, but still didnt work at all. Best regards, Nico

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