# CFX and cylindrical coordinates

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 December 4, 2006, 05:23 CFX and cylindrical coordinates #1 VSB Guest   Posts: n/a Hi As a simple example I have started with modeling laminar flow through a pipe I have created a mesh in ICEM CFD in cartesian coordinates(I presume ICEM allows you to create geometries in cartesian coordinates only) After exporting it to CFX, How should I specify the velocities and other details in cylindrical coordinates? Also let me know if ICEM permits creation of geometry in cylindrical coordinates. Thanks VSB

 December 4, 2006, 08:33 Re: CFX and cylindrical coordinates #2 Joe Guest   Posts: n/a After exporting it to CFX, How should I specify the velocities and other details in cylindrical coordinates? Create a new cylincrical CS in Pre.

 December 4, 2006, 13:38 Re: CFX and cylindrical coordinates #3 Robin Guest   Posts: n/a CFX actually gives you cylindrical coordinates (r and theta) about the Z axis of any coordinate system. If you pipe is aligned with the Z axis, you'll already have access to these. If all you want is the ability to specify velocities in cylindrical coordinates, just pick this option in the boundary condition GUI. It will ask you for the primary axis, so you may still need to create a coordinate system if your pipe is not aligned with a global axis, but I suspect it is. What exactly do you need the cylindrical coordinate system for? Regards, Robin

 December 7, 2006, 11:02 Re: CFX and cylindrical coordinates #4 VSB Guest   Posts: n/a Hi Robin and Joe, I would like to know one thing. If I model a pipe flow problem using cylindrical coordinates and cartesian coordinates, will there be a difference in the solution values obtained in both the techniques? I have been getting contrasting views from different people. I need your help. Thanks VSB

 December 7, 2006, 11:16 Re: CFX and cylindrical coordinates #5 opaque Guest   Posts: n/a Dear VSB, ANSYS CFX only works with cartesian coordinates.. You can input data in cylindrical coordinates, and they will be converted to their cartesian components. Most 3D codes are in cartesian coordinates, and 2D codes offer an option for axisymmetric cases. What is your main concern? mesh discretization of the curvilinear terms? The physics of the flow does not know anything about the mesh, or reference frame selected.. Opaque

October 8, 2013, 14:43
#6
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Pjotr
Join Date: Mar 2012
Posts: 30
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Hi
Do ANSYS CFX still accept only Cartesian coordinate system?
Trying to add cylindrical system, for some output data..but couldn't find it out;(
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 September 4, 2014, 21:41 How to define Cylindrical Coordinate in CFX #7 Senior Member   mohammad Join Date: Dec 2010 Location: Seoul, South korea Posts: 214 Rep Power: 9 Dear all, It might be very simple question and I have sought for the answer in previous posts...but!!! My question is how to define a Cylindrical coordinate system; either in Pre- or Post-??? Tnx a lot

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