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

Continuity does not converge, but mass balance is ok!

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 28, 2013, 06:26
Default Continuity does not converge, but mass balance is ok!
  #1
Member
 
Andrea
Join Date: Feb 2012
Location: Leeds, UK
Posts: 79
Rep Power: 6
Andrea1984 is on a distinguished road
Hi guys,

I'm running a steady state simulation of a gas turbine combustor with species transport model (the fluids are methane and air at the moment).
I am in the very first stage of the modeling so I am trying to reach a good solution for the "cold" field (i.e. without activating the reactions at all); my problem is that the scaled residuals of continuity got stuck at about 5e-2 and I am not able to enhance this value in any way ( I am using "coupled" for pressure-velocity coupling and I have tried to play with URFs, set all the discretization schemes at first order upwind, tried the pseudo-transient formulation).
However all the other variables are converged, the mass imbalance is very low and the contours of pressure, temperature, velocity etc seems quite reasonable.
The value of the mass imbalance variable are between -4e-7 and 3e-7 in the whole domain.
Do you think I can trust this results even if the continuity equation is not converged? It may be that the scaled residuals are not a good way to evaluate the continuity convergence in this case?

Thank you

Andrea
Andrea1984 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
DPM mass balance help jpinho FLUENT 1 April 25, 2014 06:48
AMI interDyMFoam for mixer nu problem danny123 OpenFOAM Programming & Development 8 September 6, 2013 02:34
mixerVesselAMI2D's mass is not balancing sharonyue OpenFOAM Running, Solving & CFD 6 June 10, 2013 09:34
particle, parcel and mass flow rate balance flybird FLUENT 0 May 24, 2007 10:44
DEFINE_SOURCE, injection in one Cell, mass balance Vitali FLUENT 2 April 27, 2007 16:39


All times are GMT -4. The time now is 05:35.