atrium modelling
 

Hi, i am modelling an atrium building. there are two different skylight openings on the atrium. The total volume flow rate is 30 m^3/sn and 56m^3/sn for easch opening. i defined the openings as pressure-outlet. i specified the mass flow rate in kg/sn. because the pressure-inlet alternative doesnot include the mass flow information. but during iterations reversed flow is reported. finally i want to ask how i can define an opening and the flow through that opening.