Lift and drag coefficient calculation

Lowt3ch · March 4, 2018, 11:23

Dear all,
I am attempting a CFD simulation with no formal training, only basic fluid dynamics. I am attempting to validate the use of a 2D CFD method so I can use it in my project. The aerofoil I am simulating is called NACA 24112; I am simulating it at 3.5 deg angle of attack and at 1mm chord scale. Due to the scale of my model in order to have a Reynolds number of 50,000 I would need to simulate at 700m/s which is beyond the method I am using.

http://airfoiltools.com/airfoil/deta...4112-jf#polars

My values of lift and drag co-efficient are HIGHLY dependent on the velocity of the flow which means I cannot match my data to the given data. The velocity profile seems reasonable. Can anyone help me validate this?

shereez234 · March 5, 2018, 11:04

How about trying to modify the dynamic viscosity at the inlet instead of modifying velocity? 700m/s is hypersonic speed.

March 4, 2018, 11:23	Lift and drag coefficient calculation	#1
Lowt3ch New Member Andre Join Date: Mar 2018 Posts: 1 Rep Power: 0	Dear all, I am attempting a CFD simulation with no formal training, only basic fluid dynamics. I am attempting to validate the use of a 2D CFD method so I can use it in my project. The aerofoil I am simulating is called NACA 24112; I am simulating it at 3.5 deg angle of attack and at 1mm chord scale. Due to the scale of my model in order to have a Reynolds number of 50,000 I would need to simulate at 700m/s which is beyond the method I am using. http://airfoiltools.com/airfoil/deta...4112-jf#polars My values of lift and drag co-efficient are HIGHLY dependent on the velocity of the flow which means I cannot match my data to the given data. The velocity profile seems reasonable. Can anyone help me validate this?

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March 5, 2018, 11:04		#2
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	How about trying to modify the dynamic viscosity at the inlet instead of modifying velocity? 700m/s is hypersonic speed.