2way FSI overset issue

Hi all,

I am trying to model a hyperelastic flap using 2-way FSI. The setup is similar to what is shown in this video https://www.youtube.com/watch?v=ebljsUfFIwo, except that I am using overset mesh method. However, the overset mesh updating seems not correct during the simulation. Here is what I got

Beblow is the correct overset mesh senario. As you may notice the mesh of the component part is distorted somehow.


I think my overset mesh setup is not correct. I used "deforming" for overset surface in Dynamic Zone Setup, and chose "unspecified".

Could anyone point out what might causes this issue and how to correctly set up the overset mesh method in Fluent? I am using ANSYS 2020R2.

Thank you very much!

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