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

2D or Axisymmetric PROBLEM

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 26, 2011, 19:32
Post 2D or Axisymmetric PROBLEM
  #1
New Member
 
MackatAUS
Join Date: Sep 2011
Location: UK and AUS
Posts: 1
Rep Power: 0
macatuk is on a distinguished road
I am studying the stratified flow in pipe, but I am not clear some points such this kind of flow, in which water lying on bottom and compressed Air flow on the top in pipe, and void fraction is 0.5.

To save time consuming, how can I choose to set up my model correctly in Fluent (Using Re-construct VOF), "Between using 2D model or Axisymmetric model"?

As I just found only that 2D model is used for studying the flow in channel, and Axisymmetric will be introduced when the geometry and flow condition are symmetry around axis.

So, anyone who has experienced such this flow condition, please help to clarify this for me too. Please!!!

Big Thanks!!!

Regards
Mac

Last edited by macatuk; September 27, 2011 at 06:39.
macatuk is offline   Reply With Quote

Old   September 29, 2011, 13:41
Default
  #2
New Member
 
Join Date: Nov 2010
Posts: 19
Rep Power: 6
m.beh is on a distinguished road
hi
as I understand you have a horizontal pipe with 2 flow in it, liquid at the bottom and gas at teh top.
As I know, your case is not axisymetric.

your case is just symetry but you can not model your case with the boundary of symmetry too because you have a pipe and you can not model it with a 2D symetry boundary.

so I think in your case you must use a 3D case.

you can use a symmetry boundary for a half of pipe in a 3D case.

that is all I know

hope you can find your solution soon
m.beh is offline   Reply With Quote

Old   September 29, 2011, 16:28
Default
  #3
Senior Member
 
Mohammad
Join Date: Feb 2010
Location: Shiraz, Iran
Posts: 108
Rep Power: 7
m2montazari is on a distinguished road
hi,
exactly m.beh is right. only thing you can do is to use symmetry plane that has normal vector in Z direction(if axis of pipe is in X direction and gravity is in Y direction)

mohammad
m2montazari is offline   Reply With Quote

Old   October 15, 2011, 02:00
Default axisymmetric in stratified flow
  #4
Senior Member
 
Vaze
Join Date: Jun 2009
Posts: 133
Rep Power: 8
mvee is on a distinguished road
As far as the stratified flow is concerned there woundn't be any axisymmetry. This will be in the case of annular vertical flow not even annular horizontal flow.

rgds,
Mvee
mvee is offline   Reply With Quote

Reply

Tags
fluent 6.3, multi phase flow, pipe flow, vof model

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
2-D axisymmetric Problem Lesh2Flash OpenFOAM Native Meshers: blockMesh 1 December 18, 2010 09:27
Velocity profiles problem behind the elbow (3D problem) kabat73 FLUENT 8 May 9, 2010 04:26
2D Axisymmetric Problem sameer FLUENT 1 March 4, 2006 05:43
Can CFX-5.7 solve axisymmetric problem in 2-D? Xueying CFX 7 October 27, 2005 09:57
Is this problem well posed? Thomas P. Abraham Main CFD Forum 5 September 8, 1999 14:52


All times are GMT -4. The time now is 19:50.