Hello Rwoolhou and Karthik,


Thankyou for your quick response. as per the initial design from the client there is a mass imbalance in the current case. so in order to maintain mass balance we have considered 3 door openings as leakages for remaining flowrate to go out from the domain. these 3 door openings are considered as pressure outlet boundary conditions in the model. 

inshort we have velocity inlet boundary condition for volume inflow.

we have velocity inlet with negative sign at velocity outlet boundary condition.

the remaining flowrate is sent out of the domain by using pressure outllet bc along three doors.

please let me know if you need more info on this 


i have one more quire. i have attached a molar concentration image in this. please refer that. please find the question in the image itself.