[dreamchaser]

Hi,

I am doing a 2-D simulation of a rotating cylinder near a flat plate.
Boundary Conditions:
Inlet and outlet is just set to a static pressure of 0Pa. The rotating wall is set to have a velocity of 5rad/sec. All other boundaries are set to no-slip wall.

I attached the picture of the problem I am trying to solve with my boundary conditions. I would like to make sure my boundary conditions are correct because I am getting an error in CFX. The error description is below. I am thinking it is because I have a rotating wall attached to another wall (Wall2 and Wall3) and wanted someone to please check this for me.

I refined my mesh and was still getting the error below. I attached two pictures of my mesh. The error described that "nodes on a rotating surface might not lie on the surface of revolution" made me think my mesh was wrong. Looking at my up close picture of my mesh, I just wanted some feedback if this was okay.

Any insight would be greatly appreciated.


| The angle between the specified velocity and the element surface is|
| 88.902 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.