Thickness boundary layer

Cecco · May 16, 2012, 04:28

Dear all,
how can I calculate the thickness of the boundary layer along a blade of an axial fan?

Thanks guys

Far · May 17, 2012, 04:09

You should run your ur calculation and then measure the thickness of boundary layer. However, for the purpose of fine tuning mesh parameters, use the flat plate boundary layer formulae

http://en.wikipedia.org/wiki/Boundary-layer_thickness

http://www.ae.metu.edu.tr/~ae244/doc...07/node12.html

Cecco · May 17, 2012, 12:29

Thank you man! Think I'm gonna do this:
1. I use the Blasius formula for flat plane in order to get an idea of the thickness
2. I run a first simulation containing something like 5 elements along this thickness
3. After that I could have the real measurement of the thinkness, so that I could run one more simulation more refined.

Far · May 17, 2012, 12:32

At least 10-15 nodes in boundary layer thickness. Also take care of first node position according to yplus requirement. Do not exceed the 1.2 ratio in BL

May 16, 2012, 04:28	Thickness boundary layer	#1
Cecco Member Francesco Join Date: Jan 2012 Posts: 31 Rep Power: 14	Dear all, how can I calculate the thickness of the boundary layer along a blade of an axial fan? Thanks guys

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May 17, 2012, 04:09		#2
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	You should run your ur calculation and then measure the thickness of boundary layer. However, for the purpose of fine tuning mesh parameters, use the flat plate boundary layer formulae http://en.wikipedia.org/wiki/Boundary-layer_thickness http://www.ae.metu.edu.tr/~ae244/doc...07/node12.html

May 17, 2012, 12:29		#3
Cecco Member Francesco Join Date: Jan 2012 Posts: 31 Rep Power: 14	Thank you man! Think I'm gonna do this: 1. I use the Blasius formula for flat plane in order to get an idea of the thickness 2. I run a first simulation containing something like 5 elements along this thickness 3. After that I could have the real measurement of the thinkness, so that I could run one more simulation more refined.

May 17, 2012, 12:32		#4
Far Senior Member Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,558 Blog Entries: 6 Rep Power: 54	At least 10-15 nodes in boundary layer thickness. Also take care of first node position according to yplus requirement. Do not exceed the 1.2 ratio in BL