XANSYS Message: 4381 [Go back to message list]
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Subject: Re: PCG Solver Warning
Author: Homayoon Rezvani Naraghi
Date: 1999-09-01 12:53:00I think that is the maximum of the ratio between two different elements of
the stiffness matrix. Either the structure is at certain locations much
stiffer than at the others, or you use beams or shells with improper length
units so the ratio between translatory and rotary stiffness is too high and
the stiffness matrix is ill conditioned. I'd rather use the sparse or
frontal solver . The ratio 1e8 shouldn't be a problem for them, while the
iterative solvers can not deal with ill conditioned matrices.
Best regards,
Homayoon
elawrence@s... wrote:
> From: elawrence@s...
> I need to enter a low
> value for the modulus of elasticity to model
> a material with rubber type characteristics.
> When I do this, I get the warning (using
> PCG Solver), "Coefficient Ratio Exceeds 1e8,
> Check Results."
> What does this warning mean? Or wbere in the
> Help would this be explained?
> Thanks in advance,
> Elizabeth