Rotational Direction

Ametex · September 25, 2014, 10:18

Good day all

I am new to this forum and Ansys.

I did a transient rotor stator analysis on a impeller, and I used the global y axis as the rotational axis, my direction of rotation is in the negative y direction (according to the right hand rule).However when I look at the results the rotating direction is the other way around.

I did all the tutorials, but still don't know what I'm doing wrong.

Attached is a video of my results.

Thank you

Opaque · September 25, 2014, 12:42

If you plot the "Rotational Velocity" vectors, are they pointing in the expected direction ? This vector is "Omega x R" as interpreted by the ANSYS CFX Solver; therefore, you can see if there is a setup issue.

Hope the above helps,

Ametex · September 26, 2014, 06:33

Thank you for your reply.

I am now more confused. Somehow the rotational direction for the impeller and water is different.

Can you explain this?

evcelica · October 3, 2014, 10:45

I have no experience in this, but are you using the same coordinate system for both? I can see that causing this discrepancy.

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September 25, 2014, 12:42		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,873 Rep Power: 33	If you plot the "Rotational Velocity" vectors, are they pointing in the expected direction ? This vector is "Omega x R" as interpreted by the ANSYS CFX Solver; therefore, you can see if there is a setup issue. Hope the above helps,

October 3, 2014, 10:45		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	I have no experience in this, but are you using the same coordinate system for both? I can see that causing this discrepancy.