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not converged in spite of the low error value
Posted 21.01.2017, 11:59 GMT-5 Studies & Solvers Version 5.2, Version 5.2a 2 Replies
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Hi,
I'm modeling a reactor with turbulent fluid flow and heat transfer and got really confused. The Nonlinear
solver reaches the error value lower than 1e-10 however the solver dose not stop the calculation. Could any one assist me with this problem?
2 Replies Last Post 26.01.2017, 11:54 GMT-5
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Posted:
7 years ago
Hi,
There are several criteria which need to be fulfilled for a solution to be considered as converged.
Maybe the discussions in
www.comsol.com/community/forums/general/thread/35375
can be of some help.
Regards,
Henrik
There are several criteria which need to be fulfilled for a solution to be considered as converged.
Maybe the discussions in
www.comsol.com/community/forums/general/thread/35375
can be of some help.
Regards,
Henrik
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Posted:
7 years ago
Hi ,
Dear Henrik,
Thank's for your reply.
I read that page and your explanation completely.
The damping factor for my case was descended.
I have three questions:
1- What should be done to prevent this happening ?
2- Does setting termination criteria to be "solution or residual" help solve this problem ?
3- I want to know what is the reason for the statement :
"it is required that the damping factor in the Newton solver is 1 before the solution is accepted"
Could you introduce some references for further study ?
Best regards
Michael Potter
Dear Henrik,
Thank's for your reply.
I read that page and your explanation completely.
The damping factor for my case was descended.
I have three questions:
1- What should be done to prevent this happening ?
2- Does setting termination criteria to be "solution or residual" help solve this problem ?
3- I want to know what is the reason for the statement :
"it is required that the damping factor in the Newton solver is 1 before the solution is accepted"
Could you introduce some references for further study ?
Best regards
Michael Potter