# cylindrical coordinate

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 October 22, 2014, 04:46 cylindrical coordinate #1 New Member   Join Date: Jul 2014 Posts: 9 Rep Power: 3 Hi, How can I use cylindrical coordinates in ANSYS CFX?

 October 22, 2014, 05:33 #2 Senior Member   Thomas MADELEINE Join Date: Oct 2014 Posts: 122 Rep Power: 2 Hi, your question is quite large... When you have defined your axis you can access to the radius and theta variables. See any tutorial in turbomachinery (tuto #14 for instance) to have an example. papamichous likes this.

 October 22, 2014, 09:02 #3 New Member   Join Date: Jul 2014 Posts: 9 Rep Power: 3 Hi, i want simulate this case of water flow through a porous media Last edited by papamichous; October 23, 2014 at 11:37.

 October 22, 2014, 10:30 #4 Senior Member   Thomas MADELEINE Join Date: Oct 2014 Posts: 122 Rep Power: 2 So if you want to simulate without the standpipes you have a rotationnal symmetry. So you can define only a part of the domain (1/6 => 60° for instance) and use the axis to define your symmetry. You will have a radius variable in CFX Pre. In the case you want to keep your standpipes (it can affect the flow), you don't have any symmetry so you wille have to define the whole domain and I don't know how create an axis... In this case I will probably use a very ugly method by create my own radius expression... for instance if you axis is z: Radius = sqrt((x-x0)²+(y-y0)²) Theta = atan(y/x)*step(x)+(atan(y/x)+180)*step(-x) or something equivalent papamichous likes this.

 October 22, 2014, 11:46 #5 New Member   Join Date: Jul 2014 Posts: 9 Rep Power: 3 can you create the geometry for me for both?

 October 23, 2014, 04:18 #6 Senior Member   Thomas MADELEINE Join Date: Oct 2014 Posts: 122 Rep Power: 2 Hi, I am sorry but I can't create the geometry... But I don't think it is really complex... you can create a cylinder a cut it into three pieces... Then for the one with standpipe: you add two small cylinders. For the symmetric one: you cut every thing by an angle of your choice (45° or 60° sounds correct to me) Normally any 3D CAD software can handle it papamichous likes this.

 October 23, 2014, 09:33 #7 New Member   Join Date: Jul 2014 Posts: 9 Rep Power: 3 how can I represent the shear stress between the fluid medium and the porous medium?

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