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

Comparing Unscaled Continuity Residual with an appropriate scale

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 31, 2012, 09:01
Default Comparing Unscaled Continuity Residual with an appropriate scale
  #1
Member
 
sagila
Join Date: May 2012
Posts: 39
Rep Power: 14
sagila is on a distinguished road
Hello,


In FLUENT User Guide, in the section of "Judging Convergence", it is mentioned that:
If you make a good initial guess of the flow field, the initial continuity residual may be very small leading to a large scaled residual for the continuity equation. In such a situation it is useful to examine the unscaled residual and compare it with an appropriate scale, such as the mass flow rate at the inlet.

Is there anybody who could help me understand what it means by examining the unscaled residual and comparing it with an appropriate scale, such as the mass flow rate at the inlet?


For instance, in my case that I am simulating with FLUENT:
unscaled continuity residual = 0.005,
mass flow rate at inlet = 0.024068371 kg/s,
mass flow rate at outlet = 0.024068366 kg/s,
net flux imbalance of mass flow rate = 5e-9.


Thanks.
Best Regards,
Sagila

Last edited by sagila; June 3, 2012 at 06:50.
sagila is offline   Reply With Quote

Reply


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 Courant Number @ icoFoam Artex85 OpenFOAM Running, Solving & CFD 11 February 16, 2017 14:40
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM Running, Solving & CFD 8 March 28, 2016 12:08
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 16:33
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 06:24
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07


All times are GMT -4. The time now is 16:16.