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-   -   How to get u plus (https://www.cfd-online.com/Forums/openfoam-solving/59229-how-get-u-plus.html)

lakeat December 25, 2007 08:46
For a given field, can anyone
 
For a given field, can anyone tell me how to calculate u+?

u+=U/u_tau
u_tau=sqrt(tau_w/rho)
tau_w=mu*(∂u/∂y)|y=0

Am I in the right way?

Merry Christmas to You All.http://www.cfd-online.com/OpenFOAM_D...part/happy.gif
Daniel

nuovodna January 14, 2008 04:48
i have the same problem....in
 
i have the same problem....in what way can i compute u+? is there a solver like computeYplus ??

lakeat January 14, 2008 08:44
Yes, there are some utilities
 
Yes, there are some utilities on yplus, like

checkYPlus
yPlusLES

Good luck!

Daniel

ariorus January 15, 2008 05:45
Hello Daniel, you could wri
 
Hello Daniel,

you could write your own application if you need u+.

By the way here http://www.cfd-online.com/cgi-bin/Op...8488#POST18488

is computed u_tau y /nu, so you can modify it to extract u+.

Rosario.


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