CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM

CYCLIC BC in pipe flows

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

LinkBack Thread Tools Search this Thread Display Modes
Old   November 5, 2009, 10:52
Default CYCLIC BC in pipe flows
Matthias Walter
Join Date: Mar 2009
Location: Rostock, Germany
Posts: 63
Rep Power: 17
matthias is on a distinguished road

I have a question about applying the cyclic boundary condition to pipe flows. You can find a pic of my mesh in the attachment. It consists of a small short pipe positioned along the centerline of a longer bigger pipe.
The following bc conditions have been assigned to the patches:

1. shell big pipe -> wall
2. shell small pipe -> wall
3. outlet patch -> inletOutlet
4. inlet patch and patch at the end of small pipe -> cyclic

Furthermore the radial patches are subdivided according the cross section of the two pipes.

Now I want to apply the cyclic bc to the patches listed in point 4 in a similar manner like they are used in channelfoam, but the calculated pressure gradient is added to the entire domain (in channelfoam). But in my application the fluids mix at the end of the small pipe (coaxial jetmixer), so I can not apply the pressure gradient to the whole domain.
Actually, the start up length should only provide a fully turbulent pipe flow at the begin of the mixing area.

Is it possible to use the cyclic bc in this context or is the directMapped bc a better alternative?

best regards

Attached Images
File Type: jpg screen.jpg (89.6 KB, 151 views)
matthias is offline   Reply With Quote


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
setup problems - LES pipe flow with cyclic BC (1) and direct mapped inlet (2) florian_krause OpenFOAM 22 June 13, 2013 21:25
Problems with Cyclic & init. BCs for turbulent (k-eps) pipe flow florian_krause OpenFOAM 3 December 1, 2012 04:11
What do we know about pipe flows? KUMAR Main CFD Forum 5 October 16, 2007 02:39
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 21:31

All times are GMT -4. The time now is 22:22.