Flow without a channel (outlet)

I am having trouble modeling a flow in which there is no defined outlet. For example, imagine 2 hair dryers perpendicular to each other blowing air to a plate. There is an inlet, hair dryer's nozzle, but there is not an specific outlet because its an open system, without a channel for the fluid to flow.

I tried to model that using many outlets instead of not pointing any, but it did not work for laminar flow. Should I use turbulent flow instead? Which type? If the air being blew is cooling the plate, which boundary should be the outflow?

Thanks.