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Error-System matrix is zero

Posted Jun 21, 2012, 4:08 p.m. EDT 5 Replies

Jitendra Loganathan
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Failed to find a solution.
System matrix is zero.
Returned solution is not converged.

Can anyone please explain me about this error?
5 Replies Last Post Sep 9, 2013, 5:56 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Jun 22, 2012, 5:04 a.m. EDT
Hi

most often it is because you are missing A BC or you have not fully defined the solution. Particularly, when you have many physics, you need enough BC for ALL physics independently. else the solution is not unique.

--
Good luck
Ivar
Hi most often it is because you are missing A BC or you have not fully defined the solution. Particularly, when you have many physics, you need enough BC for ALL physics independently. else the solution is not unique. -- Good luck Ivar
Jitendra Loganathan
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Posted: 1 decade ago Jul 2, 2012, 6:20 p.m. EDT
Thank you.
Thank you.
Xu Li
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Posted: 1 decade ago Mar 28, 2013, 10:36 p.m. EDT
Could you please tell me what A,B and C stand for? Thank you very much~
Could you please tell me what A,B and C stand for? Thank you very much~
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 29, 2013, 3:43 a.m. EDT
Hi

Sorry, I was typing to quick ;)

I intended to write "...a BC (Boundary Condition) ..."

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Good luck
Ivar
Hi Sorry, I was typing to quick ;) I intended to write "...a BC (Boundary Condition) ..." -- Good luck Ivar
Ayan Roy Choudhury
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Posted: 1 decade ago Sep 9, 2013, 5:56 a.m. EDT
Sir
I am doing a coiled heat exchanger problem, I have defined all the boundary conditions-viz- temperature, fluid velocity, material properties but still this error ocuurs. Tell me how can I rectify this.

Sir I am doing a coiled heat exchanger problem, I have defined all the boundary conditions-viz- temperature, fluid velocity, material properties but still this error ocuurs. Tell me how can I rectify this.

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