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Shockwave in airfoil analysis

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Old   December 31, 2007, 17:44
Default Shockwave in airfoil analysis
  #1
Alex
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Hi, currently I am doing a shockwave analysis on an airfoil with a a condition freestream Mach < 1, so that shockwave would occur somewhere downstream flow on an airfoil.

I am absolutely sure there was shockwave in my case. But I wasn't able to identify the shockwave in velocity contour map and I do not know what is the characteristic of shockwave that would help me to identify it.

Could someone please show me a map of velocity contour map that has shockwave that would help me to identify the shockwave ?

Thank you in advance Alex
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Old   December 31, 2007, 19:54
Default Re: Shockwave in airfoil analysis
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cfd_newbie
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http://en.wikipedia.org/wiki/Supercritical_airfoil

http://www.lerc.nasa.gov/WWW/wind/va.../raetaf04.html

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Old   January 1, 2008, 03:06
Default Re: Shockwave in airfoil analysis
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Vishal
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Dear Alex,

As there will be a pressure drop across the shock, try by viewing Cp contours, also disable auto options and give some less higher limit by enabling global options.I think this will do.

Regards,

Vishal
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Old   January 2, 2008, 02:12
Default Re: Shockwave in airfoil analysis
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Alex
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Thank you, cfd_newbie and Vushal. This makes more clear to me.

This leads to another question. Since the pressure drops across the shock, which I can clearly see it from the map, would it be the same as in flow separation caes?, ie the pressure would suddenly drop.

If possible, could you please provide a map of velocity and Cp that has flow separation?

Thank you Alex
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Old   January 2, 2008, 13:36
Default Re: Shockwave in airfoil analysis
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cfd_newbie
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If you want a good introduction to the shock wave theory I recommend you to read:

Modern compressible flow, by J. D. Anderson.

or

Fundamentals of Aerodynamics , by J. D. Anderson.

If you only want to visualize the flow pattern in a compressible flow around an airfoil you could consult the Van Dyke Album of Fluid Motion.

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