Boundary layer thickness for airfoil

lconstantin · October 14, 2016, 04:31

Hi all,

Considering that the velocity profile near the boundary of an airfoil (e. g. at 20%c distance from the LE) has the following form:

How can I measure the boundary layer thickness? The free stream velocity is 1m/s, but the velocity doesn't get close to this value until relatively far from the airfoil.

agd · October 14, 2016, 17:23

What is your Reynolds number? Unless you are modeling a very small airfoil, a velocity of 1 m/s is going to result in a very thick viscous region around the airfoil. The term boundary layer may not even apply.

lconstantin · October 17, 2016, 03:27

The fluid is air, and the chord of the airfoil is 1 m. Yes, the Reynolds number is quite high. I will think about it. Thank you!

October 14, 2016, 04:31	Boundary layer thickness for airfoil	#1
lconstantin New Member Join Date: Sep 2016 Posts: 9 Rep Power: 10	Hi all, Considering that the velocity profile near the boundary of an airfoil (e. g. at 20%c distance from the LE) has the following form: How can I measure the boundary layer thickness? The free stream velocity is 1m/s, but the velocity doesn't get close to this value until relatively far from the airfoil.

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October 14, 2016, 17:23		#2
agd Senior Member Join Date: Jul 2009 Posts: 358 Rep Power: 19	What is your Reynolds number? Unless you are modeling a very small airfoil, a velocity of 1 m/s is going to result in a very thick viscous region around the airfoil. The term boundary layer may not even apply.

October 17, 2016, 03:27		#3
lconstantin New Member Join Date: Sep 2016 Posts: 9 Rep Power: 10	The fluid is air, and the chord of the airfoil is 1 m. Yes, the Reynolds number is quite high. I will think about it. Thank you!