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-   -   Centrifugal force/ Rotating Wall (https://www.cfd-online.com/Forums/fluent/30064-centrifugal-force-rotating-wall.html)

 david July 21, 2002 21:33

Centrifugal force/ Rotating Wall

Hi All, When we define a rotating wall, do we have to add the centrifugal force (mw^2r or mv^2/r) to the momemtum equation in Fluent, or she does by herself ??!!

DC

 Ashu July 22, 2002 01:40

Re: Centrifugal force/ Rotating Wall

You need to specify the center of rotation and speed (rad/s). Centrifugal force gets calculated automatically during solution. Ashu

 Laika July 22, 2002 03:57

Re: Centrifugal force/ Rotating Wall

Are you sure you need a moving wall, and not a rotating reference frame?

The first is a boundary-condition. It applies a shear stress on the fluid at the wall. The second is a real moving zone you must assign to the entire fluid zone.

You can obtain the same results, but the moving wall simulation migth take longer to converge than the moving reference-simulation.

If your wall has in it's movement a component perpendicular to its surface, the shear-stress-formulation of the moving wall is incomplete to describe your problem. In that case the moving reference-frame is the only correct way.

Laika, still orbiting

 s.jaiswal December 6, 2013 02:46

Quote:
 Originally Posted by Ashu ;101852 You need to specify the center of rotation and speed (rad/s). Centrifugal force gets calculated automatically during solution. Ashu
Hi friends,
My problem related to providing centrifugal force while giving a constant rotation to the body which is a square cavity filled with water. Meshing is done by the use of Gambit and simulation is to be performed in Ansys fluent.
The cavity is rotated with the origin of itself.
I want to know how the centrifugal force can be provided in the fluent.
Is there any UDF in the momentum source is required to define the centrifugal force?
Please let me know.

 s.jaiswal January 2, 2014 07:30

thanks for your reply!!

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