CFD Online Logo CFD Online URL
Home > Forums > FLUENT

udf: dimensionless wall coordinate

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

LinkBack Thread Tools Display Modes
Old   June 22, 2004, 06:10
Default udf: dimensionless wall coordinate
Posts: n/a
I need to determine the dimensionless wall coordinate u+=u/u_tau from within an udf. The missing link is the friction velocity u_tau=sqrt(tau_w/rho). Obviously enough, the wall friction tau_w is only available for cells adjacent to a wall. While Fluent does know a macro which delivers the distance from a cell to the nearest wall, it lacks the possibility to specify which cell that would correspond to (at least I haven't found that possibility).

So, in short, my question is: Does anybody have an idea how to get a pointer to the nearest cell adjacent to a wall from any given cell inside the fluid thread?

regards, Chris
  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
Accessing wall shear stress using UDF Robert Fluent UDF and Scheme Programming 2 July 31, 2013 08:34
How to udf the wall boundary condition in VOF gawainhe FLUENT 1 December 24, 2008 20:00
udf variable for wall temperature Kiran FLUENT 0 July 31, 2008 08:31
wall suction udf osman turan FLUENT 2 July 17, 2008 07:09
UDF to monitor minimum pressure on the wall Arvind Jayaprakash FLUENT 0 September 20, 2007 11:53

All times are GMT -4. The time now is 03:08.