REYNOLDS NUMBER!!!

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 November 1, 2006, 09:31 REYNOLDS NUMBER!!! #1 Sze Hong Ng Guest   Posts: n/a ok here is my problem, ive got to simulate the shockwaves over a NACA 0012 at mach 0.8 my problem resides in that basically i cannot find any documents which state Reynolds number, rho,u,l and mu to reference my stuff from I cant even start the project. Every report ive searched for states a Re and maybe 1 other parameter but nothing else! Please help me or tell me what are the benchmarks to start any flow simulation of a NACA 0012 from. Thanks

 November 1, 2006, 11:29 Re: REYNOLDS NUMBER!!! #2 ag Guest   Posts: n/a I don't understand your post. You say that you can't find documents giving Reynolds number, but that every report you've searched states Reynolds number. Assuming that you do have a Reynolds number and Mach number, then pick a temperature (atmospheric tables can be used if you want to simulate a particular altitude - this will also give you a density). Use the temperature to compute speed of sound, and use that to compute free-stream velocity. The temperature also gives the viscosity, if you use Sutherland's law or the power law. The length scale you choose depends on what you used to non-dimensionalize your equations of motion.

 November 2, 2006, 07:47 Re: REYNOLDS NUMBER!!! #3 Sze Hong Ng Guest   Posts: n/a ok, what i meant was basically that i need to validate first CFX. I have the wing ordinates of a NACA0012, i need to test the wing at sea level, therefore i know the values of rho, u and mu. but i still have one value which im missing, Re and/or l the thing is that I need to know basically the reference wing chord length that people usually use, my lecturer tolme that it should be around 0.2...m but he's not sure.

 November 2, 2006, 08:49 Re: REYNOLDS NUMBER!!! #4 ag Guest   Posts: n/a If you have the coordinates of the wing, then you have the chord length of the airfoil. Why not use that?

 November 5, 2006, 19:35 Re: REYNOLDS NUMBER!!! #5 F.B.Tian Guest   Posts: n/a you can try this: Re=sqrt(\gama R T_0)Ma*D/(\niu)

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