# induced drag calculation

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 November 6, 2005, 03:59 induced drag calculation #1 yanko Guest   Posts: n/a Hi, Do anybody know how to get the induced drag coefficient from StarCD ? Please Help!

 November 10, 2005, 11:42 Re: induced drag calculation #2 tomosada Guest   Posts: n/a you can use the "acoeff" of STAR-CD command. Very simple to get.

 November 14, 2005, 07:33 Re: induced drag calculation #3 yanko Guest   Posts: n/a 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.

 November 15, 2005, 05:11 Re: induced drag calculation #4 Anton S. Lyaskin Guest   Posts: n/a 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

 November 16, 2005, 09:55 Re: induced drag calculation #5 yanko Guest   Posts: n/a 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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