# Friction velocity in Channel flow

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

 May 13, 2010, 18:45 Friction velocity in Channel flow #1 Member   Kim Yusik Join Date: Dec 2009 Posts: 39 Rep Power: 7 Dear Foamers. I use a pisoFoam based solver and have turbulent inlet boundary(using LES), I hope the turbulence doesn't decay or develop through channel.(like channelFoam) To normalize the result, I need to know the friction velocity(u_tau or u*). when I use channelFoam, I can output the dpdx in each time, so from there I could calculate the friction velocity. but pisoFoam case, I have no idea. So, I am wondering is there any utility to calculate friction velocity. or equivalent properties. (i.e. u_tau^2 = dp/dx*h = tau_w/rho, where h is half depth of channel) Thank you very much Yusik

 April 10, 2013, 10:09 #2 New Member   Jakub Pola Join Date: Feb 2011 Posts: 17 Rep Power: 6 Hello Yusik, I'm interested in this as well. Have you found some way to plot u_plus( y+) for channel flow? Cheers, Kuba.

 April 11, 2014, 01:33 #3 Member   CHARLES Join Date: May 2013 Posts: 46 Rep Power: 4 This may be useful to obtain the values you need: y+ and u+ values with low-Re RANS turbulence models: utility + testcase

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post anita OpenFOAM Running, Solving & CFD 7 September 25, 2012 05:35 pankaj saha Main CFD Forum 8 April 15, 2009 11:34 lett FLUENT 17 April 9, 2009 10:56 Quarkz Main CFD Forum 5 October 2, 2005 07:50 chong chee nan FLUENT 0 December 29, 2001 06:13

All times are GMT -4. The time now is 05:48.