fluid properties for 0.15 mach number

Aadhavan · April 28, 2015, 09:08

Dear All,
I have a problem to get the fluid properties, I want to replicate some of the experimental work in CFD.

The work which I want to replicate is McGhee et al low speed aerodynamics characteristics of a 17 % thick airfoil.

In their work they used a range of Reynolds number vs angle of attack. How ever they mentioned that the lift and drag co efficients are function of Mach number.

The Mach numbers are 0.10 and 0.15, but I am wondering that how they calculated the Re number?

I have the following information, from the below information I need to calculate velocity.

Re range is = 2 *10^6 to 20*10^6

M = 0.15
Chord length = 58.42 cm

My questions are,

How can I get kinematic viscosity, density, and dynamic viscosity?

Thanks,
Aadhavan,

agd · April 28, 2015, 12:21

You are going to need more information. At a minimum you need a freestream temperature. With that you can compute the speed from the Mach number and estimate the viscosity from Sutherland's law. Then use the Reynolds number to get the density.

April 28, 2015, 09:08	fluid properties for 0.15 mach number	#1
Aadhavan Member Aathavan Join Date: Nov 2012 Posts: 70 Rep Power: 14	Dear All, I have a problem to get the fluid properties, I want to replicate some of the experimental work in CFD. The work which I want to replicate is McGhee et al low speed aerodynamics characteristics of a 17 % thick airfoil. In their work they used a range of Reynolds number vs angle of attack. How ever they mentioned that the lift and drag co efficients are function of Mach number. The Mach numbers are 0.10 and 0.15, but I am wondering that how they calculated the Re number? I have the following information, from the below information I need to calculate velocity. Re range is = 2 10^6 to 2010^6 M = 0.15 Chord length = 58.42 cm My questions are, How can I get kinematic viscosity, density, and dynamic viscosity? Thanks, Aadhavan,

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April 28, 2015, 12:21		#2
agd Senior Member Join Date: Jul 2009 Posts: 358 Rep Power: 19	You are going to need more information. At a minimum you need a freestream temperature. With that you can compute the speed from the Mach number and estimate the viscosity from Sutherland's law. Then use the Reynolds number to get the density.