CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Wall roughness in pipes

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 9, 2012, 03:32
Default Wall roughness in pipes
  #1
New Member
 
Anna
Join Date: Jun 2012
Location: Finland
Posts: 19
Rep Power: 5
Kirjain is on a distinguished road
Hello all,

I am trying to test the effects of wall rougness in straight pipes in FLUENT but the results are not compatible with corresponding values in literature. For instance, I have a 50-millimetre-diameter pipe with water flowing through it at about 2 m/s. I want to compare two cases, a smooth pipe and a pipe of roughness k = 0.01 mm. When I run the calculation, though, the results are almost identical (f1 = 0.017459, f2 = 0.017462) whereas the literature values differ significantly (f1 = 0.01738, f2 = 0.019054607). Might this only be due to the mesh being too coarse? At least the result for the smooth pipe resistance coefficient is very near to the literature value. I assume the variable roughness hight is FLUENT corresponds to the standard roughness values given in mm.

Thank you for helping!
Cheers.
Attached Images
File Type: jpg case1-pic.jpg (48.4 KB, 16 views)
Kirjain is offline   Reply With Quote

Reply

Tags
pipe, roughness hight, wall roughness

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
mergeMeshes problem Attesz OpenFOAM Mesh Utilities 3 July 29, 2015 04:15
Laminar flow and wall roughness junbbung FLUENT 1 December 2, 2012 06:57
Boundary Layer roughness/ low reynolds wall treatment Luigi_ STAR-CCM+ 1 March 14, 2012 09:40
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug unoder OpenFOAM Installation 11 January 30, 2008 21:30
Wall Roughness Error Ken FLUENT 1 April 23, 2007 12:59


All times are GMT -4. The time now is 06:00.