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-   -   How to get a velocity profile using UDF? (http://www.cfd-online.com/Forums/fluent/49334-how-get-velocity-profile-using-udf.html)

Saintest September 24, 2008 10:45

How to get a velocity profile using UDF?
 
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.

Neena September 30, 2008 06:51

what is displacement thickness in boundary layer
 
I am unable to understand the concept of displacement thickness, momentum thickness in Boundary layer.Please help

Neena September 30, 2008 06:56

what is displacement thickness in boundary layer
 
Please can you explain the concept of displacement thickness in simple words

Neena September 30, 2008 07:00

what is displacement thickness in boundary layer
 
Please can you explain the concept of displacement thickness in simple words.reply

Saintest September 30, 2008 08:49

Re: what is displacement thickness in boundary lay
 
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?:)

Saintest September 30, 2008 08:56

Re: what is displacement thickness in boundary lay
 
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.

Saintest September 30, 2008 09:02

Re: what is displacement thickness in boundary lay
 
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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