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Error, No eigenvalues found
Posted Dec 3, 2010, 9:04 a.m. EST 4 Replies
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Hi All,
I have a 3D geometry and am trying to obtain eigenfrequencies. It is very simple geometry, I obtained eigenfrequencies for 2D, but I cannot obtain for 3D. Comsol gives me an error, saying that "no eigenvalues found" . This is the first time I've been working on 3D geometries, maybe I am missing something?
Is there anyone who come across this problem before, or has any idea why I get this error?
Thanks in advance,
Elif
I have a 3D geometry and am trying to obtain eigenfrequencies. It is very simple geometry, I obtained eigenfrequencies for 2D, but I cannot obtain for 3D. Comsol gives me an error, saying that "no eigenvalues found" . This is the first time I've been working on 3D geometries, maybe I am missing something?
Is there anyone who come across this problem before, or has any idea why I get this error?
Thanks in advance,
Elif
4 Replies Last Post Dec 8, 2010, 8:42 a.m. EST
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Posted:
1 decade ago
Hi
that can happen if you have a missing boundary condition, i.e. no fixed or restrained dof (or not sufficient restained dof) often this gives also 1-6 eigenfrequencies around 0Hz depending on the number of restrained Dof
--
Good luck
Ivar
that can happen if you have a missing boundary condition, i.e. no fixed or restrained dof (or not sufficient restained dof) often this gives also 1-6 eigenfrequencies around 0Hz depending on the number of restrained Dof
--
Good luck
Ivar
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Posted:
1 decade ago
Ivar,
I guess this wouldn't lead to the error message. Elif might forget to add a 3-D application (physics) after he'd added his 3-D geometry.
Elif,
may you attach your file. That may help.
Good luck,
Stephan
I guess this wouldn't lead to the error message. Elif might forget to add a 3-D application (physics) after he'd added his 3-D geometry.
Elif,
may you attach your file. That may help.
Good luck,
Stephan
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Posted:
1 decade ago
Hi
I agree that there are probably seveal reasons for this error, and that a clean "free-free" 3D body eigenvalue simulation so far has always given me a result with 1-6 frequencies at or around 0Hz. There are so many possible combinations
--
Good luck
Ivar
I agree that there are probably seveal reasons for this error, and that a clean "free-free" 3D body eigenvalue simulation so far has always given me a result with 1-6 frequencies at or around 0Hz. There are so many possible combinations
--
Good luck
Ivar
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Posted:
1 decade ago
Thanks very much for the answers. I guess it was boundary related problem, I have changed the boundaries and some other things, now it works.