# Axisymmetric pipe model confusion

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 January 3, 2006, 06:57 Axisymmetric pipe model confusion #1 Ahmed Guest   Posts: n/a Sponsored Links Do we have to model the half pipe horizontally? Because if we make it vertical the symmetry axis boundary will be parallel to (or on) the y axis and the velocity inlet that we define becomes radial rather than axial. Axial means parallel to the axis and we need it to be axial. It is easy when the half pipe is horizontal. But in my model, because I want to see the gravity effects when the pipe is vertical, does FLUENT make the correct calculations for the "axisymmetric flow 2d" while the radial velocity is the value I give for velocity inlet?

 January 3, 2006, 08:45 Re: Axisymmetric pipe model confusion #2 kp Guest   Posts: n/a For velocity you need to divide your velocity with inlet dispersed phase volume fraction.

 January 3, 2006, 10:45 Re: Axisymmetric pipe model confusion #3 Ahmed Guest   Posts: n/a hi! What do you mean by that?

 January 3, 2006, 11:07 Re: Axisymmetric pipe model confusion #4 Aidan Guest   Posts: n/a set the problem up as a horizontal pipe. The effects of gravity in the axial or radial direction are included by specifing the direction of gravity in the operating conidtions panel. For example, for a vertical pipe, gravity for the x-direction is set to -9.81 and 0.0 for y-direction.

 January 3, 2006, 17:30 Re: Axisymmetric pipe model confusion #5 Ahmed Guest   Posts: n/a Hi and thanks for your answer Aidan. Very interesting thing happens when I do that. (gx=-9.81 and gy=0 in the operating conditions window) The results do not change. All the same. Even the iteration number for convergence is same. Am I missing something or do we change the gravity from another menu? I have checked what i do 2 times and it is still the same. Did you try that? Thanks again... Anybody.

May 26, 2014, 07:41
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Goutam Saha
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Quote:
 Originally Posted by Ahmed ;127404 Hi and thanks for your answer Aidan. Very interesting thing happens when I do that. (gx=-9.81 and gy=0 in the operating conditions window) The results do not change. All the same. Even the iteration number for convergence is same. Am I missing something or do we change the gravity from another menu? I have checked what i do 2 times and it is still the same. Did you try that? Thanks again... Anybody.
Dear Ahmed, I did the same thing, but I found the results doesn't change. Did you able to solve this issue? Thanks for your time.

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