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Default fluid type in XFOIL

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Old   July 17, 2013, 09:33
Default Default fluid type in XFOIL
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yuan tian
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Hello

I encountered a problem when I am trying to do some calculation with XFOIL.

I did some measurements with an airfoil in a wind tunnel. And now, I would like to do some calculations with XFOIL using the same configurations as in the measurements.

Since XFOIL gives CL CD directly, I think it is necessary to know the type of fluid (in order to use the right \rho). How can I check that? Or is it possible to change the fluid type to air?

Maybe I am wrong...Please enlighten me. Thank you very much.
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Old   July 18, 2013, 03:17
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Hi,

When you use XFoil, if defining a viscuous calculation, you have to set the Reynolds number and Mach of the simulation. That's the only way you define your fluid, and it should be enought.
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Old   July 18, 2013, 03:37
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yuan tian
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Thank you for your reply...

I still have some doubts...If the fluid type is only defined this way, how would XFOIL calculate CL CD? Since we need F/(0.5\rho U^2 S) to get CL CD, right?
Or does it calculate those another way?

Thank you
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Old   July 19, 2013, 02:07
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Quote:
Originally Posted by kenya0514 View Post
Thank you for your reply...

I still have some doubts...If the fluid type is only defined this way, how would XFOIL calculate CL CD? Since we need F/(0.5\rho U^2 S) to get CL CD, right?
Or does it calculate those another way?

Thank you
You dont have to know the fluid type. maybe you can check Drela's paper, Section 3. http://web.mit.edu/drela/Public/papers/xfoil_sv.pdf
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