# Rotating plate.

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 November 4, 2010, 18:07 Rotating plate. #1 New Member   Farzan Join Date: Nov 2010 Posts: 3 Rep Power: 8 Hi everyone, I'm trying to model two rotating discs with some radial plates between them, with axial flow. The picture shown here: Inlet mass flow is used in the bottom, outlet pressure in the end and rotational periodic in each side. All the walls are rotating around the x axis. I have no problem with modeling just two rotating discs but when I add the radial plate to the geometry, I get this error at the the first step of solver. | ERROR #002100080 has occurred in subroutine CHECK_NORMV. | Message: | The specified velocity vector on the boundary patch | | | Default Domain Default | | | has a significant normal component at one or more faces. One of | these face locations is | (x,y,z) = ( 4.43340E-03, 3.68905E-02, 5.00000E-04). | The angle between the specified velocity and the element surface is | 89.217 degrees at this face. This is considered an error because | it implies that the mesh is moving. The following are possible | reasons for the error message: | 1. There is a setup error; for example, an incorrect axis of | rotation. | 2. There may be a meshing problem; for example, the nodes on a | rotating surface might not lie on the surface of revolution. 3. The boundary is curved and the mesh is very coarse. In this | case, you may increase the tolerance for this check by | increasing the expert parameter 'tangential vector tolerance' | from its default of 20 degrees. The location (x,y,z) refers to the a point at the end of the plate. P.S. I refined the mesh in that spot but it didn't work. Last edited by farrr; November 4, 2010 at 18:30.

 November 5, 2010, 11:47 #2 Senior Member   Join Date: Apr 2009 Posts: 532 Rep Power: 14 What's your rotation axis? I assume you need to use MFR for this. In a rotating domain, any counter-rotating walls must be tangential to the rotation direction. In a stationary domain, any rotating walls must be tangential to the specified velocity direction.

 November 5, 2010, 11:49 #3 Senior Member   Michael P. Owen Join Date: Mar 2009 Posts: 196 Rep Power: 10 You need to put the system in a rotating frame of reference and apply counter-rotating wall velocities to the fixed walls, instead of attempting to apply a rotating wall velocity to the rotating plate. The wall velocity has to be tangent to the wall, otherwise the system is not stationary.

 November 5, 2010, 13:03 #4 New Member   Farzan Join Date: Nov 2010 Posts: 3 Rep Power: 8 Thank you folks. I'll try that.

 October 17, 2011, 22:53 #5 New Member   zzr Join Date: Oct 2011 Posts: 5 Rep Power: 7 is it work ? now i have a same problem,and have no idea

 October 19, 2011, 18:30 #6 New Member   Farzan Join Date: Nov 2010 Posts: 3 Rep Power: 8 It was long time a go. But I think it worked.

 October 20, 2011, 02:48 #7 New Member   zzr Join Date: Oct 2011 Posts: 5 Rep Power: 7 toaday ,i use the rotating frame and counter-rotating wall to define the simulation,but the same problem is occour.i want to know what you did in your work.

 July 20, 2015, 14:24 #8 Member   Thiagu Join Date: Oct 2012 Location: India Posts: 59 Rep Power: 6 counter rotating wall's mesh is coarse hence surface normal are >25 (cfx default). Refining could be an option or removing 3D features

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