[mazhar16823]

Hi,


I have two symmetry boundaries separated at 120 degrees while the blade geometry is kept in between. I used these two boundaries to create a periodic interface but I see that the two boundaries are not matching.



Usually, after creating a periodic interface for two symmetry boundaries, they have to become null. But in my case, both symmetry boundaries and the created interface are trimmed as shown in the figures.



Any idea; why does this happen?



Thanks for your time.




Best regards,

[Eifoehn4]

You did not even mention what kind of tool you are using. Let me guess it's Star-CCM+?

I can't tell you why the periodic boundaries are not found. Perhaps you pressed the wrong button?

More information would help. Something like ..

• step a
• step b
• step c
• ...

Regards

[mazhar16823]

Originally Posted by Eifoehn4

You did not even mention what kind of tool you are using. Let me guess it's Star-CCM+?

I can't tell you why the periodic boundaries are not found. Perhaps you pressed the wrong button.

More information would help. Something like ..

• step a
• step b
• step c
• ...

Regards

Hi,


Yes I am using CCM+. So here is what I did:


- Imported the surface mesh in .NAS format in CCM+ (Unchecked merge cell type, and changed unit to mm during the import)


- Assigned parts to regions and provided them with boundary conditions such as inlet, outlet, wall and symmetry etc


- Added the surface mesh to Automated meshing loop and generated the mesh. Chose models in Continua. And selected two symmetry boundaries and created periodic interface by right clicking the these boundaries and choosing "create interface". Here, according to CCM+ guide, if symmetry boundaries are transformed into periodic interface -they will become null ensuring that both boundaries are matching. But in my case as you see in the figures half part of symmetry boundaries appear on newly created interface, and half on the old symmetry boundaries (the ones before being converted to interface).