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Old   November 4, 2010, 18:07
Default Rotating plate.
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Farzan
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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.
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Old   November 5, 2010, 11:47
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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.
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Old   November 5, 2010, 11:49
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Michael P. Owen
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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.
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Old   November 5, 2010, 13:03
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Farzan
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Thank you folks. I'll try that.
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Old   October 17, 2011, 22:53
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zzr
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is it work ?
now i have a same problem,and have no idea
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Old   October 19, 2011, 18:30
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Farzan
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It was long time a go. But I think it worked.
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Old   October 20, 2011, 02:48
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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.
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