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How to get a velocity profile using UDF?

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Old   September 24, 2008, 10:45
Default How to get a velocity profile using UDF?
  #1
Saintest
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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.
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Old   September 30, 2008, 06:51
Default what is displacement thickness in boundary layer
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Neena
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I am unable to understand the concept of displacement thickness, momentum thickness in Boundary layer.Please help
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Old   September 30, 2008, 06:56
Default what is displacement thickness in boundary layer
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Neena
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Please can you explain the concept of displacement thickness in simple words
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Old   September 30, 2008, 07:00
Default what is displacement thickness in boundary layer
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Neena
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Please can you explain the concept of displacement thickness in simple words.reply
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Old   September 30, 2008, 08:49
Default Re: what is displacement thickness in boundary lay
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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?
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Old   September 30, 2008, 08:56
Default Re: what is displacement thickness in boundary lay
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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.
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Old   September 30, 2008, 09:02
Default Re: what is displacement thickness in boundary lay
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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

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