CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM Post-Processing

Plotting u+ versus y+

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   April 11, 2010, 08:39
Default Plotting u+ versus y+
Join Date: Nov 2009
Posts: 99
Rep Power: 9
Gearb0x is on a distinguished road
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
Gearb0x is offline   Reply With Quote

Old   December 18, 2012, 02:18
New Member
Mohammad Reza Rastan
Join Date: Dec 2012
Posts: 1
Rep Power: 0
mrezarastan is on a distinguished road
That's my problem can I achieve the first grid data from wall?
mrezarastan is offline   Reply With Quote

Old   December 18, 2012, 05:00
Senior Member
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 15
Bernhard is on a distinguished road
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?
Bernhard is offline   Reply With Quote

Old   January 22, 2013, 22:03
Senior Member
chegdan's Avatar
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 612
Rep Power: 22
chegdan will become famous soon enoughchegdan will become famous soon enough
As Bernhard mentioned, there are threads where this is discussed. Try for instance the thread
chegdan is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Plotting a velocity versus time graph wanie FLUENT 4 February 3, 2017 01:11
plotting temperature versus time graph milton.tafadzwa OpenFOAM Post-Processing 0 April 18, 2009 06:37
Properties of air versus temperature AND pressure Vincent Main CFD Forum 5 July 28, 2008 06:28
variable versus time Cesare CFX 1 September 27, 2004 11:00
Plotting "in-plane" in 3-D Karl Kevala FLUENT 0 September 6, 2001 17:47

All times are GMT -4. The time now is 10:06.