Can mfix define a circulars boundary condition?

Dear developer:
I want to define two boundary condition like the figure.But I found I only can define rectangular region.Can I define circular region in mfix?Are there any teaching or case studies?
Thank you very much!
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Yes, you should be able to do that. Are you using cut-cell for the geometry?

Thanks for your reply!
cut-cell?I don’t know how to use it!Are there any teaching or case studies?