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Failed to find a solution??

Posted May 21, 2014, 11:07 a.m. EDT Version 4.3 3 Replies

Sepideh Ramezani
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How can i solve this problem? anyone knows?
Thank you very much
Sepideh

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Failed to find a solution.
Singular matrix.

There are 195 void equations (empty rows in matrix) for the variable mod1.p.
at coordinates: (0.528027,10.2826), (0.480722,10.5094), (13.1715,6.05448), (102.733,1.18038), (104.459,2.34395), ...
and similarly for the degrees of freedom (empty columns in matrix).
Returned solution is not converged.
3 Replies Last Post May 22, 2014, 4:40 a.m. EDT
Pieter Westerik
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Posted: 1 decade ago May 21, 2014, 11:40 a.m. EDT
I would say your problem is not well defined. Can you say a bit more about what you are trying to do and when the error occurs?
I would say your problem is not well defined. Can you say a bit more about what you are trying to do and when the error occurs?
Sepideh Ramezani
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Posted: 1 decade ago May 22, 2014, 4:29 a.m. EDT
trying to solve 2D model in fluid flow- porous media and subsurface flow- richards' equation:
steady state condition with default parameters provided by comsol except imposing hydraulic head for my boundaries.
and then after solving the project, I am confronting with this error.
If it is not clear, please let me know to explain more.

Thanks in advance for your help.
Sepideh
trying to solve 2D model in fluid flow- porous media and subsurface flow- richards' equation: steady state condition with default parameters provided by comsol except imposing hydraulic head for my boundaries. and then after solving the project, I am confronting with this error. If it is not clear, please let me know to explain more. Thanks in advance for your help. Sepideh
Pieter Westerik
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Posted: 1 decade ago May 22, 2014, 4:40 a.m. EDT
Sorry I have no experience with the things you mention.
Sorry I have no experience with the things you mention.

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