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k-epsilon turbulent flow error when angle of attack is changed
Posted Apr 10, 2012, 6:20 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD) Version 4.2a 1 Reply
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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
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
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1 Reply Last Post Apr 26, 2012, 4:31 p.m. EDT
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Posted:
1 decade ago
same problem here, especially at large positional angles when analyzing blades of a turbine.