# Global coordinate system and rotation-axis origin

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 October 10, 2011, 01:22 Global coordinate system and rotation-axis origin #1 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 5 Dear CFD-forum members, I have a problem with a rotating part and I work with ANSYS 13.0. I got a CAD-file and I have to simulate a rotation with it in ANSYS FLUENT. I know that I must set the wall to a moving wall and the water in it to a standing fluid but I do not know where my rotation-axis origin is. It should be in the middle of my part but it is not there. My question is: How can I see where the global coordinate system is or how can I put it to another place, e.g. to the middle of my rotating part? I also use ICEM CFD and Autodesk Inventor 2009 if someone knows the answer in these programs. Thank you in advance for your answers Norger sircorp likes this.

 October 10, 2011, 09:28 #2 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 5 Does nobody has an answer for my problem?

 October 11, 2011, 00:59 #3 New Member     sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 5 Hi, You should be very sure about your rotating axis before coming to the solver. In Fluent solver there is no such option to trace axis of rotation. So go back to your CAD (Inventor) file and locate 2 points which lie in axis of rotation. Then specify co-ordinates of these 2 points as origin and direction vector in Fluent. Regards Sabin Mathew

 October 11, 2011, 03:01 #4 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 5 Hey, thank you for your answer. I have an example to know whether I rightly understood you. If the origin of the coordinate system is in the middle of my rotating part and the y-axis should be the rotating axis, the rotating-axis origin is (0;0;0) and the rotating-axis direction is (0;0;1). Is it right? Best regards

 October 11, 2011, 03:48 #5 New Member     sabin mathew Join Date: Sep 2011 Location: Mumbai Posts: 18 Rep Power: 5 with small correction, rotating axis direction is (0, 1, 0) Keep going... Last edited by sabin; October 11, 2011 at 04:06.

 October 11, 2011, 08:28 #6 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 5 Thank you very much! Your answer solved my problem.

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