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[DesignModeler] Internal Wall Definition (2D) |
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October 1, 2012, 15:46 |
Internal Wall Definition (2D)
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#1 |
New Member
Colin Heye
Join Date: Oct 2012
Posts: 3
Rep Power: 13 |
I am trying to simulate flow through two concentric pipes using an axisymmetric 2D simulation (not periodic).
The first difficulty is that the inner pipe is only half as long as the outer and neither end extends to the inflow nor outflow of the whole domain. Thus, I need to define an internal wall zone, but I would like to define it as infinitely thin and avoid removing material from the domain. I have tried sketching lines and making them "edges" of a sort, but they do not appear in the Meshing software and I am left with a simple rectangular domain. The second issue may be solved in the same way, but I need to define a region within the inner pipe in which to apply a fan model in FLUENT. I understand how to implement the fan model, but it requires defining a zone in the geometry. If someone can help me with imposing non-intrusive lines on the geometry for meshing purposes, I would greatly appreciate it. Thank you! |
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October 1, 2012, 22:49 |
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#2 |
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Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
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what software are you using to mesh ? if you are using ICEM CFD. just draw your cylinders with creating fluid domain inside because it's a surface based mesher.
i have never tried internal wall in ansys meshing, but i think you forgot to create a surface out of your edges. you do that in concept menu ---> surface from edges. give it a try... If it doesn't work i will try it my self and see how it works |
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October 2, 2012, 06:37 |
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#3 |
Senior Member
Join Date: Feb 2011
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Maybe you should use two domains and interfaces between them?
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October 2, 2012, 10:07 |
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#4 |
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Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
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Right, create surfaces from the curves... You will want two bodies and you can combine them into a multibody part if you want conformal mesh.
You can select edges and create Names Selections for the internal wall boundary conditions...
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October 4, 2012, 15:04 |
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#5 |
New Member
Colin Heye
Join Date: Oct 2012
Posts: 3
Rep Power: 13 |
Thank you for your help! I ended up projecting the edges onto the rectangular domain which I had to set to "frozen".
If you are willing to help me on another issue, I would greatly appreciate it. My geometry is as I would like, but I am unable to mesh a 2D domain with inflations. I have many walls in the domain now and grid clustering in the boundary layer regions. I have tried specifying "sizing" on some edges, but that does not increase the number of cells anywhere except on the surface. Can you tell me how I can cluster an unstructured mesh in a 2D domain? |
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October 4, 2012, 16:49 |
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#6 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
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Look up 2D inflation in the help...
// Meshing User's Guide // Local Mesh Controls // Inflation Control Scroll down and look for the notes specific to 2D inflation. It is a little odd in the way you need to select the 2D body and the edges for inflation, but once you see how, you shouldn't have any trouble with it.
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----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey |
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November 18, 2013, 11:20 |
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#7 |
New Member
Dimitris Romanas
Join Date: Sep 2013
Posts: 29
Rep Power: 12 |
Hi all,
i have two bodies(frozen in DM) and when i go to fluent and use VOF model there is ONE DOMAIN....i want two domains and i dont know how i can define them before go to fluent.... i want one with air..one with water.. thank you in advance! |
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