CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

detect checkerboarding in CFD code

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 18, 2016, 20:32
Default detect checkerboarding in CFD code
  #1
Member
 
Kan
Join Date: Feb 2014
Location: Australia
Posts: 54
Rep Power: 4
nwpukaka is on a distinguished road
Dear Forumer,

I understand that the checker-boarding issue is really annoying, but luckily some artificial ways have been introduced to resolve this problem.

Can we automatically detect the checker-boarding issue during the simulation? What I mean is if there is any criteria for us to determine this oscillating cell. Then we can apply the artificial way to that specific cell in order to resolve the checker-boarding. I guess this question is quite similar to shock detection problem, hopefully there is a similar way to detect the checker-boarding.

Thank you in advance,
Kan
nwpukaka is offline   Reply With Quote

Old   January 19, 2016, 05:02
Default
  #2
Senior Member
 
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,518
Rep Power: 31
FMDenaro will become famous soon enoughFMDenaro will become famous soon enough
Quote:
Originally Posted by nwpukaka View Post
Dear Forumer,

I understand that the checker-boarding issue is really annoying, but luckily some artificial ways have been introduced to resolve this problem.

Can we automatically detect the checker-boarding issue during the simulation? What I mean is if there is any criteria for us to determine this oscillating cell. Then we can apply the artificial way to that specific cell in order to resolve the checker-boarding. I guess this question is quite similar to shock detection problem, hopefully there is a similar way to detect the checker-boarding.

Thank you in advance,
Kan
Actually, this problem is just determined by the discretization without any need of running a simulation. That is produced by larger stancil of the pressure equation that decouples different grids.
During a simulation, you would see the velocity field having oscillations on a wavelenght of the decoupled cells
FMDenaro is offline   Reply With Quote

Old   March 10, 2016, 01:02
Default
  #3
Member
 
Kan
Join Date: Feb 2014
Location: Australia
Posts: 54
Rep Power: 4
nwpukaka is on a distinguished road
Quote:
Originally Posted by FMDenaro View Post
Actually, this problem is just determined by the discretization without any need of running a simulation. That is produced by larger stancil of the pressure equation that decouples different grids.
During a simulation, you would see the velocity field having oscillations on a wavelenght of the decoupled cells
Thank you for your reply, can we define a scalar as an indicator for the checker-boarding?
nwpukaka is offline   Reply With Quote

Old   March 10, 2016, 04:34
Default
  #4
Senior Member
 
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 2,518
Rep Power: 31
FMDenaro will become famous soon enoughFMDenaro will become famous soon enough
Quote:
Originally Posted by nwpukaka View Post
Thank you for your reply, can we define a scalar as an indicator for the checker-boarding?
what do you mean? I think no scalar can be deduced from the solution to check that
FMDenaro is offline   Reply With Quote

Reply

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
Free CFD code with implementation of Menter's k-omega SST model nikola_m Main CFD Forum 1 November 9, 2012 10:39
CFD Code with Fortran murat Main CFD Forum 0 October 11, 2009 17:05
Where do we go from here? CFD in 2001 John C. Chien Main CFD Forum 36 January 24, 2001 22:10
CFD JOBS and Expected Salary.... Noel Harrison Main CFD Forum 11 November 22, 2000 08:15
user friendly cfd code waqar Main CFD Forum 19 August 18, 2000 16:31


All times are GMT -4. The time now is 03:14.