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

Mass balance problem!

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 19, 2003, 14:07
Default Mass balance problem!
  #1
JADG
Guest
 
Posts: n/a
Hello!!

I have problem with the mass balance in a pipe with one inlet and two outlets. I am using velocity inlet and Pressure outlet as B.C. But the mass balance doesn't mach, there is a difference of 20% between the mass flow rate at the inlet and the outlets. Any ideas how can I close the mass balance?

Thanks in advance

JADG
  Reply With Quote

Old   December 20, 2003, 07:13
Default Re: Mass balance problem!
  #2
ap
Guest
 
Posts: n/a
You could try reducing the accepted residuals for convergence of the continuity equation.

Hi

ap
  Reply With Quote

Old   December 21, 2003, 07:41
Default Re: Mass balance problem!
  #3
Venkatesh
Guest
 
Posts: n/a
I hope you must be using the segregated solver. Just plot the contours of Mass Balance and you can find where the mass balance residuals are high. Check the quality of grid at that location. If you feel the quality is OK then reduce the convergence limit.
  Reply With Quote

Old   December 21, 2003, 15:33
Default Re: Mass balance problem!
  #4
JADG
Guest
 
Posts: n/a
Thank you guys I will reduce the residual limits.

JADG
  Reply With Quote

Old   December 27, 2003, 11:40
Default Re: Mass balance problem!
  #5
Sijal Ahmed
Guest
 
Posts: n/a
set the target mass flow rate by the mass-flow-rate-settings text command

bye

  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
DPM mass problem Henrik Ström FLUENT 9 May 20, 2016 12:00
mass convergency problem c120613 CFX 1 May 25, 2010 08:20
Multiphase mass balance GZD Siemens 0 August 6, 2008 14:37
The mass balance in restriction of FAS implement Tiger Main CFD Forum 1 September 15, 2006 12:13
mass injection in a 2D axi-symmetric problem hyun Main CFD Forum 1 April 26, 2006 01:25


All times are GMT -4. The time now is 23:08.