CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

rhoPimpleFoam - airflow through plenum - unstable residuals

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 12, 2021, 11:53
Default rhoPimpleFoam - airflow through plenum - unstable residuals
  #1
New Member
 
Join Date: Feb 2020
Posts: 6
Rep Power: 6
OisinOC is on a distinguished road
Hi,

I am trying to use rhoPimpleFoam to simulate airflow through some small ducts. I have 3D printed and measured the pressure drop for a square 90 degree bend, a round 90 degree bend and now a plenum like bend in the duct. My round bend had a good match for pressure drop and the square was reasonable but the plenum model seems very unstable when I view the residuals.



I think the problem might be that because the air spreads out as it enters the plenum and slows down there a wider range of velocities and my model is not set up correctly to handle it.

I've attached the case files but the mesh is too big to attach. Can anyone suggest how I might improve it?
Attached Images
File Type: jpg Residuals.jpg (137.0 KB, 5 views)
Attached Files
File Type: zip rhoPimpleFoam_test_duct.zip (10.2 KB, 2 views)
OisinOC is offline   Reply With Quote

Reply

Tags
air flow analysis, duct flow, rhopimplefoam

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
Cannot find functionObject file residuals vava10 OpenFOAM Pre-Processing 2 November 14, 2020 12:21
pimpleFoam, rhoPimpleFoam unstable at small Courant numbers (time-steps) peob OpenFOAM Running, Solving & CFD 18 November 13, 2020 13:56
Simulation of the airflow through a bunch of little balls RobertW FLUENT 14 April 5, 2020 17:38
motorBike Residuals for SST k-omega... and mine JR22 OpenFOAM Running, Solving & CFD 6 August 1, 2013 09:08
judging convergence through residuals MachZero Main CFD Forum 7 December 25, 2012 12:18


All times are GMT -4. The time now is 07:03.