# 2D or Axisymmetric PROBLEM

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 September 26, 2011, 19:32 2D or Axisymmetric PROBLEM #1 New Member   MackatAUS Join Date: Sep 2011 Location: UK and AUS Posts: 3 Rep Power: 8 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.

 September 29, 2011, 13:41 #2 New Member   Join Date: Nov 2010 Posts: 19 Rep Power: 8 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

 September 29, 2011, 16:28 #3 Senior Member   Mohammad Join Date: Feb 2010 Location: Shiraz, Iran Posts: 109 Rep Power: 9 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

 October 15, 2011, 02:00 axisymmetric in stratified flow #4 Senior Member   Vaze Join Date: Jun 2009 Posts: 155 Rep Power: 10 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

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

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