[Hybrid]

Hi,

I am trying to simulate a rotor in hovering. To make mesh size small, I wish to use periodic BCs.

In MRF, two fluid zones are defined:

1: Moving Zone (make periodic zones are successful)
2: Stationary Zone ( making periodic zones are unsuccessful)

How can I make zones periodic in the Stationary Fluid Zone?

Any help, suggestion, comment, plz?

[Far]

Yes, you can make them periodic!!!

[Hybrid]

How I can make periodic? It gives error.:
Failed to make zones periodic.
Error object: #f
Can you explain?

Mesh_Image

[Far]

Hi.

I tried on both models and used three methods.

What I did was: (1st method) ---> sucessful

1. Made the zone rotation axis to Y axis

2. Change per2 and shad2 to interface

3. used interface panel and make the mesh periodic


2nd method (not successful):

1. Made the zone rotation axis to Y axis

2. Used these command. define > bc > mz > mp > select pair of periodic surfaces

3rd method: (not successful):

1. Rotate the model so that axis of rotation is Z axis.

2. Used these command. define > bc > mz > mp > select pair of periodic surfaces

3. Possible problem is that axis of rotation is not passing through center of periodic surfaces. You should do it in the meshing software.


Note: Why are you using 180 deg sector?

[Hybrid]

I have two blades, so 180deg sector.
I used Ansys Meshing, in moving zone, periodic zone was successful.

I am sorry, not to tell you the rotation axis, i think (0.045, 0, 0).

Now I tried in Pointwise, periodic zones are successful but getting the error

   Periodic zone   7: average rotation angle (deg) = 180.000 (180.000 to 180.000)
                      stored zone rotation angle (deg)  = 180.000
                      stored axis  , (0.000000e+00, 1.000000e+00, 0.000000e+00)
                      stored origin, (4.500000e-02, 0.000000e+00, 0.000000e+00)
   Periodic zone  15: average rotation angle (deg) = 170.951 (-180.000 to 180.000)
                      stored zone rotation angle (deg)  = 180.000
                      stored axis  , (0.000000e+00, 1.000000e+00, 0.000000e+00)
                      stored origin, (4.500000e-02, 0.000000e+00, 0.000000e+00)
WARNING: rotation inconsistent on zone 15. Please check periodic setup.
Done.

I am sending you the case file at your email.

[Far]

there is something wrong with origin parameters for the stater.

Can you make it periodic in gridgen?

[Hybrid]

In gridgen, I cannot apply "Periodic BC" for fluent. I did this in fluent.

[Hybrid]

Finally,

I am successful making zones periodic in Ansys Meshing by using Match Control and proper definition of Coordinates.

Job is done. Thanks for the help guys.