Mass flow rate boundary inlet condition in CFX

smhk · June 8, 2025, 16:52

Hello everyone,
Suppose we have an incompressible fluid flow and you want to use mass flow rate as an inlet boundary condition for a case in CFX. I'd like to know if CFX only calculates the mdot/area and then impose a uniform velocity field at the inlet. Or can CFX use the information from downstream nodes to find the nonuniform velocity field at the inlet concerning mdot (which is the integral over nonuniform inlet)?
I just found that Openfoam has an option for inlet flow rate that uses extrapolation from inner nodes to find the velocity distribution on the inlet.

ghorrocks · June 9, 2025, 23:50

CFX does not have an option like you request.

smhk · June 10, 2025, 06:22

Thank you.It was important to me.

June 8, 2025, 16:52	Mass flow rate boundary inlet condition in CFX	#1
smhk Member Join Date: Dec 2023 Posts: 36 Rep Power: 3	Hello everyone, Suppose we have an incompressible fluid flow and you want to use mass flow rate as an inlet boundary condition for a case in CFX. I'd like to know if CFX only calculates the mdot/area and then impose a uniform velocity field at the inlet. Or can CFX use the information from downstream nodes to find the nonuniform velocity field at the inlet concerning mdot (which is the integral over nonuniform inlet)? I just found that Openfoam has an option for inlet flow rate that uses extrapolation from inner nodes to find the velocity distribution on the inlet.

June 9, 2025, 23:50		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,984 Rep Power: 145	CFX does not have an option like you request. smhk likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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June 10, 2025, 06:22		#3
smhk Member Join Date: Dec 2023 Posts: 36 Rep Power: 3	Thank you.It was important to me.