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-   -   Why unstable solution for 3D hydrofoil in Fluent (http://www.cfd-online.com/Forums/main/12906-why-unstable-solution-3d-hydrofoil-fluent.html)

Sajal Sengupta February 1, 2007 07:04

Why unstable solution for 3D hydrofoil in Fluent
 
hi,

i'm modiling 3-D hydrofoil. can nebody describe me why solutions are unstable at an small angle of attack while there is no separation.

Mani February 1, 2007 12:24

Re: Why unstable solution for 3D hydrofoil in Flue
 
>can nebody describe me why...

No.

(that's the best answer I could come up with, based on the (lack of) information provided)

zxaar February 1, 2007 21:10

Re: Why unstable solution for 3D hydrofoil in Flue
 
In fact the word 'unstable' in the question is also confusing, whether he wanted to say that solver is unstable that it does not converge or blows up etc etc, or unstable that it does not show steady profile but produces changing velocity profile. Personally I also did not get the question.

Harish February 2, 2007 03:57

Re: Why unstable solution for 3D hydrofoil in Flue
 
May be he did not set underrelaxation or overrelaxation and caused the code to diverge.


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