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-   -   new to CFD, changing angle of attack/incidence? (http://www.cfd-online.com/Forums/star-ccm/100256-new-cfd-changing-angle-attack-incidence.html)

bjk87 April 22, 2012 10:57

new to CFD, changing angle of attack/incidence?
 
I am new to CFD and just learning how to use Star-CCM+. I was able to analyze and simulate a very simple airfoil by following tutorials. However, I do not know how to change the angle of attack. Do I just transform the geometry part by rotating it a certain amount of degrees/radians? Or is it more complex than that? Thank you.

rwryne April 22, 2012 16:19

Quote:

Originally Posted by bjk87 (Post 356215)
I am new to CFD and just learning how to use Star-CCM+. I was able to analyze and simulate a very simple airfoil by following tutorials. However, I do not know how to change the angle of attack. Do I just transform the geometry part by rotating it a certain amount of degrees/radians? Or is it more complex than that? Thank you.


Depending on your problem type, you do not need to rotate the geometry.... just change your farfield boundary conditions to reflect new velocity values (i.e. use the directional scalars of the velocity vector to "rotate" the flow)

LuckyTran April 23, 2012 15:42

Quote:

Originally Posted by bjk87 (Post 356215)
I am new to CFD and just learning how to use Star-CCM+. I was able to analyze and simulate a very simple airfoil by following tutorials. However, I do not know how to change the angle of attack. Do I just transform the geometry part by rotating it a certain amount of degrees/radians? Or is it more complex than that? Thank you.

It depends on your boundary conditions, but another way is to simply have the velocity inlet to have flow at an angle relative to the inlet instead of purely normal.

bjk87 April 23, 2012 17:05

Oh, I see. Thanks.


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