Learning Forum

[davide.dipasquale]

I have followed the tutorial on ANSYS Learning (

&t=4s) to understand how set up Periodic BCs, but it does not work for my case.
I have a 2 blades wind turbine and I want to set up a Periodic BC with an angle of 180 deg in order to simulate only 1 blade, but when I switch to fluent I have 2 separate Peridoic BCs instead of only one. Any suggestions?

[Federico]

Hello, 

can you show some screenshots of what you are seeing?

[davide.dipasquale]

Hi, I can see two periodic BCs one overlapping each other

[Federico]

What do you mean by overlapping each other? I do not see anything wrong from the screenshot above.

If you right click on periodic1 in the outline view and select Edit, you should see something like this:

where periodic1 is associated with periodic shadow zone periodic2

[davide.dipasquale]

I can see that:

[davide.dipasquale]

I do not have any shadow face

[Federico]

You do not have conformal mesh between both periodic faces. But they are still periodic.

[davide.dipasquale]

Sorry but I do not understand my mesh is conformal:

 

"Periodicity has been defined for blade10.3_nacelleddp_v15-blade10.3_nacelleddp_v15-fluid, and the mesh are now matching between the reference side (yellow) and the periodic side."

I should I have a single periodic BC?

[Federico]

Sorry, the display that I showed was for 23R2. It seems that 22R2 does not show the shadow zone in the GUI. Forget my post about conformal interface.

Maybe I misunderstood your question. You should have 2 separate periodic BCs in the Fluent Boundary panel. Basically, what comes in/out of one periodic BC will be communicated to the second periodic BC, and vice versa.

[davide.dipasquale]

Even if I use the 2023R2 version I cannot see the screenshot you have shown earlier

Addittionally, all the videos I have seen, when selecting two faces and generating Periodic BCs I should end up with one common PERIODIC BC: