Karthik R

Hello Reddy,

If I understand correctly, your continuity equation will never converge because of the mass-imbalance you are trying to maintain. Are you treating the gas as compressible or incompressible?

Ideally, I would recommend a velocity inlet (or pressure inlet) and pressure outlet boundary condition. This should ensure a positive pressure in the room as long as the flow is unidirectional.  With one value of velocity inlet and a different velocity outlet, you will always run into convergence issues. 

Please share some details (and plots) related to your model and maybe we can better help you answer the question.

Thank you.

Best Regards,