CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

high-frequency oscillations Overset

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 5, 2021, 05:33
Default high-frequency oscillations Overset
Senior Member
acalado's Avatar
Join Date: Mar 2016
Posts: 133
Rep Power: 10
acalado is on a distinguished road

I am trying to simulate a simple 2D case of a flat plate at 45 degrees moving at constant speed (low Reynolds). I am using overset mesh grid with linear motion (constant velocity). Solver is overPimpleDyMFoam (v2012)

I have tried to validate the results and they seem ok in terms of order of magnitude, but there are some high frequency "noise" in the CL. I was wondering if anyone has any ideas on what may be causing this? I am attaching some pictures of the mesh and the resulting CL over time. I have tried to play with the numerics a bit (solution methods/tolerances/schemes) but no luck...

Thanks in advance!
Attached Images
File Type: png CL.PNG (84.1 KB, 21 views)
File Type: jpg mesh1.jpg (60.1 KB, 21 views)
File Type: jpg mesh2.jpg (74.1 KB, 18 views)
File Type: jpg mesh3.jpg (62.4 KB, 14 views)
Sapere aude!
acalado is offline   Reply With Quote

Old   March 16, 2022, 14:52
Senior Member
louisgag's Avatar
Louis Gagnon
Join Date: Mar 2009
Location: Stuttgart, Germany
Posts: 338
Rep Power: 18
louisgag is on a distinguished road
Send a message via ICQ to louisgag
this is a typical problem from overset, in particular the openfoam implementation.
If you are using pimple, you can try to relax the final iterations, or setting momentumPredictor to false can also help. Be warned that the accuracy of your solution (continuity equation) may suffer, so use at your own risk..
louisgag 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
high rotational speed centrifugal pump marekpl CFX 43 April 25, 2022 18:41
2DOF Planning hull resistance study with overset CFD_fan OpenFOAM Running, Solving & CFD 7 July 13, 2021 05:03
objects oscillate at high speed causing collapse in Dynamic mesh and overset mesh ca insane OpenFOAM Running, Solving & CFD 0 May 17, 2020 22:35
smaller PSD at low and high frequency spalartallmaras Main CFD Forum 1 April 18, 2020 10:34
Oscillating Airfoil Poor Results at High k (reduced frequency) dancfd OpenFOAM Running, Solving & CFD 3 November 4, 2013 08:32

All times are GMT -4. The time now is 08:13.