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-   -   Global coordinate system and rotation-axis origin (https://www.cfd-online.com/Forums/fluent/93243-global-coordinate-system-rotation-axis-origin.html)

 norger October 10, 2011 01:22

Global coordinate system and rotation-axis origin

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.

Norger

 norger October 10, 2011 09:28

Does nobody has an answer for my problem? :(

 sabin October 11, 2011 00:59

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:)

 norger October 11, 2011 03:01

Hey,

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

 sabin October 11, 2011 03:48

with small correction, rotating axis direction is (0, 1, 0) :) Keep going...

 norger October 11, 2011 08:28

Thank you very much!

 Paul666 December 13, 2016 10:38

I want to give the rotation of the drill at a speed of 8000[rev/min^-1] in Z axis but when I defining the speed and the rotation axis shows me of the message:

In Analysis 'Flow Analysis 1' - Domain 'Air: If a solid has motion set and it is connected to a stationary fluid domain, a moving wall velocity boundary condition must be specified on the fluid solid interface.

I do not know what's going on, any ideas? I send screenshots of the program: