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.
| 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
| 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.
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.
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.
Thank you folks. I'll try that.
is it work ?
now i have a same problem,and have no idea
It was long time a go. But I think it worked.
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.
counter rotating wall's mesh is coarse hence surface normal are >25 (cfx default). Refining could be an option or removing 3D features
|All times are GMT -4. The time now is 16:53.|