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Plotting u+ versus y+

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Old   April 11, 2010, 09:39
Default Plotting u+ versus y+
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Jérémy Bulle
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Hi everybody

I would like to plot u+ against y+ to have the velocity profile near the walls.

Did anybody already try that? Normally this shouldn't be too difficult but I don't know how I cant get certain values :

y+ = U_tau * y / nu
u+ = U/U_tau

with U_tau = sqrt (Tau_wall / rho)

I think that :
Since I'm in a incompressible case rho & nu are no problem
Tau_wall : wallShearStress command in openfoam
y : I can create it myself if needed
U : How can i get it as U(y) (since it's what I need for the plot) ?

Thanks for your help
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Old   December 18, 2012, 02:18
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Mohammad Reza Rastan
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Hi
That's my problem too.how can I achieve the first grid data from wall?
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Old   December 18, 2012, 05:00
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Bernhard
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On this forum you will be able to find some threads about calculating yPlus. But I assume you can also do it in a post-processing step when you extract (y,u) data from your case?
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Old   January 22, 2013, 22:03
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Daniel P. Combest
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As Bernhard mentioned, there are threads where this is discussed. Try for instance the thread y+ and u+ values with low-Re RANS turbulence models: utility + testcase
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