CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Periodic Fully Developed Pipe Flow - Results dont make sense

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 4, 2015, 15:43
Default Periodic Fully Developed Pipe Flow - Results dont make sense
New Member
Join Date: Sep 2014
Posts: 17
Rep Power: 11
twolf59 is on a distinguished road
Hi all,

Ive modeled half of a pipe utilizing a symmetry plane, two periodic bcs, and a wall.
I specify the mass flow rate at one end and let the solution run until convergence (residuals <e-8).
This model utilizes the Low-Re turbulence model, simplec for v-p coupling, and second order methods for the fluxes.
My issue is that the results are nonsensical. Looking at the friction coefficient contours on the wall they are not uniform. The static pressure throughout the pipe is not uniform.
I believe my mesh has identical inlet/outlet interfaces.

Can someone please give me some troubleshooting tips?

PS The purpose of this model will be to extract he fully developed velocity profile and utilize it to initialize another simulation which posses more complex geometry
Attached Images
File Type: jpg meshfull.jpg (63.1 KB, 9 views)
File Type: jpg meshperiod.jpg (81.9 KB, 8 views)
File Type: jpg meshsym.jpg (85.2 KB, 8 views)
File Type: jpg staticp.JPG (25.5 KB, 11 views)
File Type: jpg cf.JPG (38.5 KB, 8 views)
twolf59 is offline   Reply With Quote

Old   March 5, 2015, 23:54
Senior Member
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,668
Rep Power: 65
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
just to make sure, this is a constant property simulation correct?

I've done these types of simulations hundreds of times and gotten great results. I'm not sure why it isn't working for you. Only thing new is that I've never tried it with a low-Re model (but I have done rke, kwsst, v2f, linear RSM & quadratic RSM). I've also done simple, piso, and the coupled solver. Have you already tried reducing the under-relaxation factors?
LuckyTran is offline   Reply With Quote


fully developed, periodic bc, pipe, turbulent

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
UDF for fully developed turbulent flow at inlet soroushsaberi FLUENT 0 May 28, 2014 17:00
Fully developed flow in Star-cd SMM STAR-CD 3 September 9, 2011 15:54
Fully Developed Flow in Star-cd SMM STAR-CD 0 September 5, 2011 22:08
OpenFOAM 1.7.1 installation problem on OpenSUSE 11.3 flakid OpenFOAM Installation 16 December 28, 2010 08:48
periodic fully developed flow in pipe periodicbc FLUENT 5 January 12, 2004 15:57

All times are GMT -4. The time now is 15:02.