[gavy]

Hi,

I am trying to simulate a 50L tank having 3 impellers. I used the tutorial on multiphase mixing given in cfx_tutr pdf to get an idea of what domains and interfaces to create. I made the tank and impeller geometries separately in autodesk, imported them in ansys cfx. Created mesh. And then assembled the tank and 3 impellers in CFX. I used boundary conditions and physics given in the tutorial.

When I run it I am getting the following error.

ERROR #002100080 has occurred in subroutine CHECK_NORMV. |
| Message: |
| The specified velocity vector on the boundary patch |
| |
| TankShaft |
| |
| has a significant normal component at one or more faces. One of |
| these face locations is |
| |
| (x,y,z) = (-9.51961E-03, 1.96403E-01, 5.36471E-03). |
| |
| The angle between the specified velocity and the element surface is|
| 29.642 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.


Can anyone guide me on how to fix it?

Thanks

[evcelica]

There could be a few things to check:

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.

I would check specifically at the location: (x,y,z) = (-9.51961E-03, 1.96403E-01, 5.36471E-03)