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Non positive diagonal entry detected.

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Message 1 of 2
jhseok
556 Views, 1 Reply

Non positive diagonal entry detected.

Hi,

 

I am trying Steady flow analysis.

I changed one parameter.

turbulence : 0 -> 1

The others are not changed.

 

I checked model using "Check model' icon.

 

During iteration it shows following message. and then stop soon.

 

Non positive diagonal entry detected in ILU method.

switch to SSOR Preconditioner.

 

Please see attached pdf for more info.

 

Thanks.

 

JH SEOK.

 

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Message 2 of 2
PipePakPat
in reply to: jhseok

Your log file shows that your analysis is fraught with problems.  Not only does your model contain "dead" elements and nodes due to coarse meshing, but your analysis does not converge for many steps prior to your error.  I would follow the first recommendation of the log file which is to use the boundary layer meshing for your fluid flow analysis, then re-analyze.

Pat Tessaro, P.E.
Premium Support Specialist – Simulation

Autodesk, Inc.
6425 Living Place
Suite 100
Pittsburgh, PA 15206

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