Question about ADS momentum boundary conditions

Hi,
Recently, I tried to import my momentum proj to CSTMS. In my opinion ,the momentum use a horizontal infinity boundary condition in the simulation. But when the proj was imported to CSTMS, it was shown that there is a box with four perpendicular walls which are perfect E around the struture. Does the momentum simulation contain the four walls? Or, the CSTMS add the four walls for 3DEM simulation?

Thank you

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