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I'm designing an ultralight for a wind tunnel test in SketchUp, and I was wondering if there was a mathematical method to optimizing the length and chord of a simple wing that would be located at the top of the body. I felt this location was best so that the airflow moving over would be as undisturbed by the rest of the body as possible. Should I use a program like Autodesk Flow first? I can run it @ 60fps for up to 1200 particles.

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  • $\begingroup$ If your idea is to try to simulate the hydrodynamic flow of air over an airfoil by studying a simulation with only 1200 particles acting as air molecules, that's not going to work. $\endgroup$
    – user93237
    Commented Mar 1, 2018 at 4:08
  • $\begingroup$ I meant to use the simulator as a rough estimate only. I would definitely prefer and probably require an in depth answer. $\endgroup$
    – Jihyun
    Commented Mar 1, 2018 at 5:00
  • $\begingroup$ I don't think that the proposed method would work even as a rough estimate. The problem is that your 1200 particle simulation corresponds to the airfoil moving through a fairly high vacuum with particles having an extremely long mean free path comparable to or greater than the size of your airfoil. That puts your simulation in a completely different hydrodynamic flow regime than air at atmospheric pressure. $\endgroup$
    – user93237
    Commented Mar 1, 2018 at 18:08
  • $\begingroup$ This is Autodesk Flow. The 'particles' are only visual representations of different resolutions, I'm pretty sure all proper laws of physics and fluid dynamics are considered in the numbers provided. $\endgroup$
    – Jihyun
    Commented Mar 1, 2018 at 23:56

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