rotating rotor with symmetric boundary condition at hub
 

Hi, there

Recently I am running a simulation with rotating rotor. I’ve already set the rotor blade wall boundary condition as No-slip + rotating wall with axial rotating velocity. In my previous case the hub of the rotor has symmetric boundary condition. So I need to keep this set up in order to make comparison. But I’m not sure if CFX support the mixed boundary condition that rotor has rotating boundary condition while hub has symmetric boundary condition. May I know how CFX deal with the intersection line between the rotor and the line? Will it has the mixed boundary condition? Or CFX doesn’t support such set-up at all?
I have tried to run the simulation but get the following error:
+--------------------------------------------------------------------+
| ERROR #002100080 has occurred in subroutine CHECK_NORMV. |
| Message: |
| The specified velocity vector on the boundary patch |
| |
| blade_rotor |
| |
| has a significant normal component at one or more faces. One of |
| these face locations is |
| |
| (x,y,z) = ( 1.59200E-03,-1.98839E-03, 3.96909E+01). |
| |
| The angle between the specified velocity and the element surface is|
| 76.578 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 modify the tolerance by increasing the |
| expert parameter 'tangential vector tolerance wall' |
| from its default of 20 degrees.
+--------------------------------------------------------------------+

Thank you in advance.

Something seems off in your setup and description.

In ANSYS CFX, symmetry is defined as a planar surface (no ambiguity there).

The message says the surface does not correspond to a surface of revolution; therefore, an error is produced.

Would you mind posting an image of the setup pointing out the required surface to understand the issue?