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error 6177

Posted Mar 24, 2010, 10:30 a.m. EDT 3 Replies

Saber Behkami
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Hi
I want to see eddy current in a metal by magnetic field of an AC voltage coil in 1MHz frequency in time harmonic mode but Comsol gives me Error:6177 (matrix has zero on diagonal. )
What can I do to solve this problem???
Thanks,
3 Replies Last Post Jun 13, 2010, 1:58 p.m. EDT
COMSOL Moderator

Hello Saber Behkami

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Nageswara Rao Peela
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Posted: 1 decade ago Jun 2, 2010, 9:12 a.m. EDT
Hi did you find solution for the problem you are getting i.e. error 6177?
If so kindly let me know.
I am also getting the same problem

-Nagesh..
Hi did you find solution for the problem you are getting i.e. error 6177? If so kindly let me know. I am also getting the same problem -Nagesh..
Danial Tz
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Posted: 1 decade ago Jun 2, 2010, 10:23 a.m. EDT
When the equations have a structure such that the stiffness matrix (Jacobian matrix) has zeros on the diagonal, it is not possible to use the following linear system solvers/ preconditioners/smoothers: all versions of SOR and Diagonal scaling (Jacobi). Try the Vanka preconditioner/smoother instead.

or a direct solver, if possible.
[quote]When the equations have a structure such that the stiffness matrix (Jacobian matrix) has zeros on the diagonal, it is not possible to use the following linear system solvers/ preconditioners/smoothers: all versions of SOR and Diagonal scaling (Jacobi). Try the Vanka preconditioner/smoother instead.[/quote] or a direct solver, if possible.
ERaja Ma
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Posted: 1 decade ago Jun 13, 2010, 1:58 p.m. EDT
Hi All,

I am also trying to simulate a similar case, wherein i want to observe eddy current in a metal, But when i use time harmonic mode, i am getting the same error. I have tried the GMRES-Vanka or GMRES-GMG and also the drect solvers but no success.

If anybody has been able to overcome this problem, kindly advise.

Hi All, I am also trying to simulate a similar case, wherein i want to observe eddy current in a metal, But when i use time harmonic mode, i am getting the same error. I have tried the GMRES-Vanka or GMRES-GMG and also the drect solvers but no success. If anybody has been able to overcome this problem, kindly advise.

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