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

mass residual

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 15, 2005, 09:45
Default mass residual
  #1
Tad
Guest
 
Posts: n/a
I am using CFX 4.4, to simulate incompressible flow using the default descretisation schemes. After the simulation is finished, I break the dump file using matlab and get information of UVELOCITY,VVELOCITY WVELOCITY, DENSITY mass residual and area of the six faces of each control volume. However when I calculate the mass balance by multiplying each component of the velocity with the perpendicular area, the residual is always by far greater than the one extracted from the dump file. The situation is getting worse when the control volume lies on the boundary. I made the velocities calculation at cell faces from cell centre values using weighted linear interpolation scheme based on relative distance in physical phases as described on the manual. May I request you to help me with this matter? Secondly, Is there some special treatment of the dummy cells at the walls, inlet and outlet?

Thank you in advance for your cooperation

Tad

  Reply With Quote

Old   February 17, 2005, 00:30
Default Re: mass residual
  #2
Jeff
Guest
 
Posts: n/a
There's an array called CONV which stores the mass fluxes at all of the faces. Using these values at each cell face times the face areas should give you the proper mass balance on the cell.

Jeff
  Reply With Quote

Old   February 17, 2005, 10:52
Default Re: mass residual
  #3
Tad
Guest
 
Posts: n/a
Thanks Jeff
  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
transsonic nozzle with rhoSimpleFoam Unseen OpenFOAM Running, Solving & CFD 7 April 16, 2014 03:38
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM 6 April 12, 2011 11:24
Differences between serial and parallel runs carsten OpenFOAM Bugs 11 September 12, 2008 11:16


All times are GMT -4. The time now is 04:01.