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-   -   Direction of rotation (http://www.cfd-online.com/Forums/cfx/21176-direction-rotation.html)

Gab April 19, 2005 20:41

Direction of rotation
 
Hi, All

I am doing tutorial 15: multiphase mixer. In that tutorial, the rotation speed of the impeller domain and shafts were set as 84 rpm. I was wondering what's the direction of the rotation. If look from up to down, do they rotate clockwise or counter clockwise? (I guess it's counter clockwise)

How can I show the rotation direction in cfx-pre or cfx-post?

Thanks

gab

Kiddo April 20, 2005 04:26

Re: Direction of rotation
 
It says that "Set Rotation Axis to Global X. " at page 306, so it means it rotates along X-axis with Right-Hand rule. The rotation direction is well defined.

Robin April 20, 2005 09:34

Re: Direction of rotation
 
To view the rotation, create a vector plot of "Velocity in STN Frame" (using hybrid values) on the walls of your rotating domain.

-Robin

Gab April 20, 2005 09:42

Re: Direction of rotation
 
Thanks, Kiddo and Robin.

If use right hand rule, the rotation direction should be counterclockwise. However,look at the blade angle shown in figure 1 of that tutorial, I understand that the rotation direction should be clockwise.

Can you further clarify this?

Thanks, with best regards!

Gab


Kiddo April 20, 2005 10:41

Re: Direction of rotation
 
Because in page302, it set the domain as rotating, so the flow vector is refered to the rotating frame (Just imagine you are in the ratating domain and the flow vector shown is what you will see)


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