# How to get a velocity profile using UDF?

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 September 24, 2008, 10:45 How to get a velocity profile using UDF? #1 Saintest Guest   Posts: n/a I tend to get a velocity profile on the wall(like airfoil or car) using UDF.but I find it's hard to search the adjacent point for a given point,if anybody kown about this area,please help.

 September 30, 2008, 06:51 what is displacement thickness in boundary layer #2 Neena Guest   Posts: n/a I am unable to understand the concept of displacement thickness, momentum thickness in Boundary layer.Please help

 September 30, 2008, 06:56 what is displacement thickness in boundary layer #3 Neena Guest   Posts: n/a Please can you explain the concept of displacement thickness in simple words

 September 30, 2008, 07:00 what is displacement thickness in boundary layer #4 Neena Guest   Posts: n/a Please can you explain the concept of displacement thickness in simple words.reply

 September 30, 2008, 08:49 Re: what is displacement thickness in boundary lay #5 Saintest Guest   Posts: n/a The defination of displacement thickness is :because the existence of boundary layer make the free stream-line "Off" the wall. the distance between the wall and the free stream-line called "displacement thickness " How do you know I know?

 September 30, 2008, 08:56 Re: what is displacement thickness in boundary lay #6 Saintest Guest   Posts: n/a you can calculate the displacement thickness as follow: delta_star=integral from 0 to h (1-desity*u/desity_far*u_far)dy you can let h equal to delta.

 September 30, 2008, 09:02 Re: what is displacement thickness in boundary lay #7 Saintest Guest   Posts: n/a The defination of momentum thickness is :because the existence of boundary layer make the loss of momentum rate. momentum thickness :theta=integral from 0 to h ((desity*u)/(desity_far*u_far)*(1-u/u_far))dy