Learning Forum

[Paul Stephen]

Hello ANSYS community,

I hope this post finds you well. I am currently working on a simulation using ANSYS 2023 R1, and I have come across a change in the interface boundary conditions compared to the previous version (ANSYS 2020 R1) that I would like to discuss. Your insights and help would be greatly appreciated.

In ANSYS 2020 R1, when setting up interface boundary conditions, I was able to individually select the "Periodic Boundary Condition" and "Matching" options. This allowed me to control the settings separately, resulting in a specific arrangement of boundary conditions in the list.

However, in ANSYS 2023 R1, it seems that when I choose "Periodic Boundary Condition" under the interface options, the "Matching" option is automatically selected as well. This contrasts with my experience in the earlier version, and it's causing a notable change in the way the boundary conditions are listed.

To help illustrate the situation, I have attached screenshots from both ANSYS 2020 R1 and ANSYS 2023 R1 versions. The changes in the user interface have caught me off guard, and I'm curious to know if this is an intentional design alteration or if there's a way to work with these settings separately in the new version.

I kindly request your guidance and insights on this matter. Have any of you encountered similar changes or have suggestions on how to achieve similar setups in ANSYS 2023 R1 as were possible in ANSYS 2020 R1? Your expertise and assistance would be invaluable as I continue my simulation work.

Thank you for taking the time to read my post. I'm looking forward to any advice or information you can provide.

Best regards, 

Paul Stephen

[Prashanth]

Hi, the one-to-one pairing is used by default in newer releases. You can disable in TUI using: define/mesh-interfaces/one-to-one-pairing? no

For more information, check the 23R1 Fluent user docs: 6.6.4. Using a Non-Conformal Mesh in Ansys Fluent

 

[Paul Stephen]

Hi, I have tried the tui command to disable the one-to-one pairing. it provided me the option to manually create the mesh interface. However, then when choosing the periodic boundary conditions the matching option is also getting selected automatically in the ansys 2023 R1 version, which was not the case with 2020 R1.

[Prashanth]

Hi, the matching condition was recommended with periodic, to avoid mislignment and other issues at the interfaces. It is now ON by default when we enable periodic boundary condition. It shouldn't cause any issue though.

[Paul Stephen]

Hi, Thank you for your reply. But this makes a difference in the zone name under boundary conditions. Do you need to worry about this? I have attached the screenshots of both.

[Rob]

It's part of the non conformal checks in the event the surfaces don't match/line up and is more for when mismatched surfaces are linked via a nonconformal mesh. They shouldn't do anything for a periodic pair, but I suspect the creation is automatic.