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Model/simplification for mid-hi Re flow?

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Old   January 19, 2008, 20:43
Default Model/simplification for mid-hi Re flow?
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I'm going to work on moving airfoils at Re=10000 for my research. I'm reading on the literature and deciding which model I need to use?

Can someone comment on that? I've read ppl using reynolds averaged NS equation, turbulence models and adding numerical dissipation etc.

Do I need to use any of these for my problem? Or is the original NS eqn sufficient?

Thank you very much.
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Old   January 20, 2008, 11:32
Default Re: Model/simplification for mid-hi Re flow?
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From the Reynolds number, I guess you are looking at subsonic speeds in air. You mention moving, which I take to mean pitching. Final assumption (bit of a stretch) is you're looking at 2D airfoil sections.

In terms of outcomes, I presume you'll want lift, drag and pitching moment - maybe also pressure co-efficient at various positions around the airfoil.

You could go with a RANS solver, or given you are likely to encounter laminar flow just the NS as you suggest.

However, before you do anything I would suggest investigating less compute intensive methods such as panel methods as outlined in Low-Speed Aerodynamics, Katz & Plotkin:

In terms of 2D modeling you might consider Xfoil:

If you want more reasons to try a panel method:

Full disclosure: I represent <a href=>Symscape</a>: Computer-Aided Engineering for All

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