I am working on a project dealing with hovercraft design and have been using flow simulation to find pressures and velocities within the skirt of the hovercraft our team designed.  It has been working up to a point however I can not seem to get the holes to work as a hole very well should, being the out flow of air. The whole point of the testing I am doing is to find out the pressure and velocity as the air exits through those holes, so without the air exiting through the holes the results are well... useless. I attached a copy of the hovercraft design for anyone that needs to look at it to help find a solution. Any advice is welcome at this point because I really do not know where to go from here.