# Boundary layer thickness

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 March 27, 2007, 10:00 Boundary layer thickness #1 Franny Guest   Posts: n/a Hi all,could anyone suggest the way to calculate boundary layer thickness?I need to plot th e velocity profile and see where its value is equals to 99 of the freestream value.I think i need to plot it along the polyline.What do you think? Regards. Franny

 March 29, 2007, 07:08 Re: Boundary layer thickness #2 Adam Guest   Posts: n/a Unfortunatly, you have to do it the hard way! 1) Create a line perpendicular to the surface at the point of interest, making sure that the line is longer than the boundary layer thickness. 2) Export the velocity profile of that line. 3) Find 0.99xUfreetsream to aqcuire the boundary layer thickness. 4) You can use Matlab etc (trapeziodal function) to calculate disp, mom thickness and hence shape factor from the velocity profile. I don't think you can do it in CFX itself, so you have to do it the long way. Hope this helps Adam

 March 30, 2007, 18:28 Re: Boundary layer thickness #3 Omer Guest   Posts: n/a I was just wondering why you would need the boundary layer thickness. Is it because you need to have a resolved boundary layer for your model? If so , plotting Y+ contour would be a good idea.

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