CFD Online Logo CFD Online URL
Home > Forums > CFX

Translational periodicity with specified mass flow rate

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

LinkBack Thread Tools Display Modes
Old   August 12, 2014, 01:48
Default Translational periodicity with specified mass flow rate
New Member
Kalle Tiitinen
Join Date: Jan 2010
Location: Finland
Posts: 2
Rep Power: 0
KalleT is on a distinguished road
Fellow CFX users,
I wanted to simulate a fully developed pipe flow using the translational periodicity bc with user specified mass flow rate. My geometry is a 90 degree section (taking advantage of the rotational periodic geometry) 4 diameters long. Fluid is water. As basic as a simulation can get.

When I apply translational periodicity with specified mass flow rate it appears impossible to obtain convergence as the solution starts to oscillate (pressure loss of the pipe section going up and down). This happens with different Reynolds numbers alike. Adjusting the pressure update multiplier even to small values like 0.001 cannot stabilize the solution. When I change interface model to specified pressure change the solution converges monotoniously and is completetely stable (resulting in same Re as targeted with specified mass flow rate).

Has anyone had similar experience with convergence using the specified flow rate? I am really not confident trying to use it for any real case if even this dummy pipe cannot be properly solved. Any ideas if I should check some particular settings?
KalleT is offline   Reply With Quote


cfx 14.5, convergence problem, translational periodicity

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
Mass Flow rate in spray water modeling Behnam Ghadimi FLUENT 0 June 8, 2013 16:05
Mass Flow rate in spray water modeling Behnam Ghadimi Main CFD Forum 0 June 8, 2013 15:48
Mass flow rate through each cell Babakjingo Main CFD Forum 0 August 21, 2011 03:18
Mass flow rate sepidecent CFX 0 August 9, 2011 00:15
mass flow rate error Masood FLUENT 0 May 22, 2005 00:32

All times are GMT -4. The time now is 16:24.