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2D or Axisymmetric PROBLEM

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Old   September 26, 2011, 19:32
Post 2D or Axisymmetric PROBLEM
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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!!!


Last edited by macatuk; September 27, 2011 at 06:39.
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Old   September 29, 2011, 13:41
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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
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Old   September 29, 2011, 16:28
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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)

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Old   October 15, 2011, 02:00
Default axisymmetric in stratified flow
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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.

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

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