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induced drag calculation

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Old   November 6, 2005, 03:59
Default induced drag calculation
  #1
yanko
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Hi, Do anybody know how to get the induced drag coefficient from StarCD ? Please Help!
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Old   November 10, 2005, 11:42
Default Re: induced drag calculation
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tomosada
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you can use the "acoeff" of STAR-CD command.

Very simple to get.

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Old   November 14, 2005, 07:33
Default Re: induced drag calculation
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yanko
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Acoeff calculates drag and lift based on near field values and output the form drag coefficient (form drag = pressure + viscous) by integrating the total force on the selected surfaces, what I'd like to know is the vortex drag (also called induced drag), the additional drag component generated by any 3D lifting body (wing, rear-front spoiler etc...). Any solution in Star? Thanks.
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Old   November 15, 2005, 05:11
Default Re: induced drag calculation
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Anton S. Lyaskin
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Calculate the drag at zero lift conditions and then subtract it from the results of the first simulation - this will be quiet close to the induced drag value
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Old   November 16, 2005, 09:55
Default Re: induced drag calculation
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yanko
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it doesn't solve the problem...if I calculate the drag at zero lift conditions and subtract it from the results of the first simulation I will get the profile drag component of the total "drag due to lift" and not the induced drag form the wing-tip vortices. I can use a Trefftz plane downstream and perform some integration to derive the vortex drag, i don't see any integrated solution in Star, if there is one, please let me know!
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