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-   -   How to detect area of separation by looking at streamlines ? (http://www.cfd-online.com/Forums/main/87476-how-detect-area-separation-looking-streamlines.html)

mohammad April 21, 2011 02:50

How to detect area of separation by looking at streamlines ?
 
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Hi everybody...
My question is after I solve a rotary wing ( wind turbine) and I see the streamlines on the suction surface, how can I understand which part is separated and which part is still attached flow?For example in the attached file which shows the streamlines on the suction surface of a wind turbine blade, can I say that "A" is area of separation and "B" is still attached?
What about "D" and "E" zones?

if so, then the whole area of "C" is fully attached??

please help me to understand it??

Thanks

cfd_newbie April 23, 2011 03:11

Quote:

Originally Posted by mohammad (Post 304501)
Hi everybody...
My question is after I solve a rotary wing ( wind turbine) and I see the streamlines on the suction surface, how can I understand which part is separated and which part is still attached flow?For example in the attached file which shows the streamlines on the suction surface of a wind turbine blade, can I say that "A" is area of separation and "B" is still attached?
What about "D" and "E" zones?

if so, then the whole area of "C" is fully attached??

please help me to understand it??

Thanks

hi Mohammed,
What you are saying is absolutely correct "C" is fully attached. "B" is attached while "A" is separated. "D" and "E" are completely separated. People generally plot these surface streamlines with Surface pressure and show then in Front, Back view so that they get a clearer picture of the flow physics.
Raashid

mohammad April 26, 2011 08:28

Quote:

Originally Posted by cfd_newbie (Post 304767)
hi Mohammed,
What you are saying is absolutely correct "C" is fully attached. "B" is attached while "A" is separated. "D" and "E" are completely separated. People generally plot these surface streamlines with Surface pressure and show then in Front, Back view so that they get a clearer picture of the flow physics.
Raashid

Dear Raashid,
Thanks a lot for your help.
One other Question is that which pressure should I use to present the existence of separation....Shear or Normal pressure( stress)?

Tnx buddy.


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