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

MassflowAve & areaAve in cfx

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 21, 2009, 01:24
Default MassflowAve & areaAve in cfx
  #1
Member
 
Join Date: Mar 2009
Posts: 46
Rep Power: 8
az_f is on a distinguished road
Hi All,
I want to calculate the total pressure difference at inlet , outlet and mid plane of one tube with blood flow. I used areAve(total pressure )@inlet and... but I don't the results calculated by massflowAve is different with AreaAve and which one is more accurate?

Any idea?

Thanks
az_f is offline   Reply With Quote

Old   May 21, 2009, 06:26
Default High diffrence?
  #2
New Member
 
Antonio P.
Join Date: Mar 2009
Posts: 10
Rep Power: 8
pantarei83 is on a distinguished road
The two values are very different? If you considered the fluid incompressible they must be similar. Otherwise I think mass flow ave is better.
pantarei83 is offline   Reply With Quote

Old   May 21, 2009, 19:27
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,646
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Hi

The massflowAve is a mass weighted average. This is best for things which are related to mass, such as species concentrations, volume fractions, temperature. The areaAve is an area weighted average. This is best for things which are area functions, like pressure. So for pressure I would use the areaAve pressure to calculate the inlet and outlet pressures.

Glenn Horrocks
ghorrocks is offline   Reply With Quote

Old   May 22, 2009, 13:40
Default
  #4
LKF
New Member
 
Join Date: Mar 2009
Posts: 16
Rep Power: 8
LKF is on a distinguished road
I think this link offers a fairly good explanation of the difference between the two averaging methods.

mass & area average
LKF 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
Pros and Cons for CFX, CFdesign, COMSOL Val Main CFD Forum 3 June 10, 2011 02:20
Importing solutions in CFX. Alphonso CFX 1 August 1, 2008 14:01
Export AreaAve data at each time step in CFX Post Kumar CFX 2 August 22, 2007 12:32
PhD using CFX Rui CFX 9 May 28, 2007 05:59
CFX 4.4 installation problem Pandu Sattvika CFX 1 December 1, 2001 05:07


All times are GMT -4. The time now is 07:15.