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Donut Sectioned Pipe Flow

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Old   October 23, 2016, 16:25
Default Donut Sectioned Pipe Flow
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Hello,

I am trying to reproduce an example of a laminar flow through a pipe. Like this:


So I am trying to make a 2D analysis by drawing a rectangle and then use axial symmetry. The problem is that if I select the axis of the pipe as the axial symmetry axis, the Jacobian of the Navier-Stokes equation is gonna tend to infinite and I'm going to have bad results around this area. So the suggestion is that I take a small region around the axis out of the problem, by imagining the section of the pipe is a donut. Like this:


My problem is that I don't know how to make this geometry with axial symmetry.
When I select the axial symmetry axis, it can't be a line am I right? There has to be some kind of of body, and I only have one body which is a surface, and the axis is out of it. This axis is represented in blue here:


Also, what kind of boundary should I select for the "wall" with the green question marks over it? It can't be a wall, because I want a velocity profile like this:


Thank you all in advance,
Luís

Last edited by cptfreak3; October 24, 2016 at 10:28. Reason: fixing image links
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