Boundary conditions for window openings

lei

Hi, I want to simulate the airflow for window openings under different outside wind speeds. So I divided the simulation space into two parts, one is the outside zone (for outside wind flow), and the other is the interior zone (for the air flow inside the room), and set the windows in two directions. As it is difficult to know the flow direction at these two openings, their boundary types are assumed to be pressure-outlet. But the Fluent told me the openings have two adjacent cell zones, and the grid check was failed. Could anyone give me some advice on setting the boundary conditions for openings, which connect the interior zone and the outside zone. Thanks very much.