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k-epsilon turbulent flow error when angle of attack is changed

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Hi

I am currently working on a project where I use Comsols k-epsilon to calculate lift/drag coeft fisients on sertain bladeprofiles for an underwater turbine.

I have imported a geometry and gotten good results for angles of attack of 0,4,8 and 12 degreese, but when I try for 16,20,24 degreese and so on I recive errors when I try to Compute.

Errormessage is most often:
"Undefined value found.
- Detail: NaN or Inf found when solving linear system using PARDISO."

But sometimes when I try computing again (not changing anything, just pressing "compute" again) I get a diffrent error message.

I have attached a screenshot of the error message.
The only thing I have changed is a rotation of the bladeprofile.

What can I do to get reults for these angles of attack?

Kind regards
Magnus Booe



1 Reply Last Post 26 apr 2012, 16:31 GMT-4

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Posted: 1 decade ago 26 apr 2012, 16:31 GMT-4
same problem here, especially at large positional angles when analyzing blades of a turbine.
same problem here, especially at large positional angles when analyzing blades of a turbine.

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