CFD Online Logo CFD Online URL
Home > Forums > CFX

contour plot: mass flow difference

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

LinkBack Thread Tools Display Modes
Old   July 22, 2010, 07:30
Default contour plot: mass flow difference
Join Date: Mar 2009
Location: chennai
Posts: 56
Rep Power: 8
jai is on a distinguished road
Pls ref attached pic.
simulation mode: transient, compressible.
I've specified mass flow rate in kg/sec in pre.
I've not get correct value in contour plot. why? my friend told that in compressible simulation you maynot get correct value, you will get only in incompressible mode only.
Is it true? pls explain
Attached Images
File Type: jpg mf diff.jpg (73.0 KB, 23 views)
jai is offline   Reply With Quote

Old   July 22, 2010, 07:58
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 11,066
Rep Power: 86
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
The contour plot is showing mass flow rate per element. You have to integrate that over the cross section to get the total mass flow rate. Your friend is correct, for transient compressible flow you will not get constant mass flow rate in general. It is due to the pressure waves, and how they take some time to travel up and down the domain.
ghorrocks is offline   Reply With Quote


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
Mass flow and U-Mom flow in CFX Zhihua Xie CFX 0 September 3, 2007 09:49
mass flow rate error Masood FLUENT 0 May 22, 2005 00:32
Mass flow rate Neser CFX 4 February 14, 2004 01:27
Mass Flow Inlet Pravir Kumar Rai FLUENT 0 February 17, 2003 20:23
How to Plot Mass Flow Rate w.r.t No. of Iterations Julie FLUENT 2 July 30, 2002 10:50

All times are GMT -4. The time now is 05:53.