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COMSOL error
Posted Jan 8, 2015, 5:42 p.m. EST Fluid & Heat, Microfluidics, Chemical Reaction Engineering, Studies & Solvers Version 4.4 1 Reply
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Hi,
When I do the coupling calculation for laminar flow module and transport and diluted species module (concentration), it always shows an error:
Undefined value found.
- Detail: Undefined value found in the stiffness matrix.
There are 11 equations giving NaN/Inf in the matrix rows for the variable comp1.c.
at coordinates: (-0.00124375,0.00168601), (-0.00124375,0.00168501), (-0.00124375,0.00168401), (-0.00124375,0.00168301), (-0.00124375,0.00168201), ...
and similarly for the degrees of freedom, NaN/Inf in the matrix columns.
Do you know what it is? How to avoid this happen?
Thanks,
When I do the coupling calculation for laminar flow module and transport and diluted species module (concentration), it always shows an error:
Undefined value found.
- Detail: Undefined value found in the stiffness matrix.
There are 11 equations giving NaN/Inf in the matrix rows for the variable comp1.c.
at coordinates: (-0.00124375,0.00168601), (-0.00124375,0.00168501), (-0.00124375,0.00168401), (-0.00124375,0.00168301), (-0.00124375,0.00168201), ...
and similarly for the degrees of freedom, NaN/Inf in the matrix columns.
Do you know what it is? How to avoid this happen?
Thanks,
1 Reply Last Post Jan 12, 2015, 6:47 a.m. EST
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Posted:
9 years ago
i also meet that problem once in a while. My experience is that you need to improve your mesh quality. Hope help.