Mass flow rate where there're no boundary conditions

ChanHoPark · July 10, 2023, 03:33

Hello I'm using ANSYS FLUENT to simulate 2-D axisymmetric nozzle flow.

And I have to find mass flow rate at nozzle's exit.
But because I want to see effects of external flow, there are no outlet condition at nozzle's end but only downstream.

So I am thinking of integrating by multiplying the speed and density by drawing a line at the exit of the nozzle with CFD-POST.
And this method seems complex

Are there any ways to calculate mass flow rate?
I'd really appreciate it if you could let me know

zacko · July 19, 2023, 11:00

How does your setup look. Usually use the function at your desired face: massFlow()@Nozzle Outlet

ChanHoPark · July 19, 2023, 22:43

I solved the problem. Momentum was obtained at the nozzle exit using interpolate in Tecplot rather than in SU2. This momentum average was multiplied by the area to give the mass flow rate.
thank you

Gmensofi · August 25, 2023, 04:52

By dividing the volume flow rate by the fluid's mass density,, one may determine the mass flow rate. The volume flow rate is derived by multiplying the cross-sectional vector area, A, by the flow velocity of the mass components.
dumb ways to die

July 10, 2023, 03:33	Mass flow rate where there're no boundary conditions	#1
ChanHoPark New Member ChanHoPark Join Date: May 2023 Posts: 2 Rep Power: 0	Hello I'm using ANSYS FLUENT to simulate 2-D axisymmetric nozzle flow. And I have to find mass flow rate at nozzle's exit. But because I want to see effects of external flow, there are no outlet condition at nozzle's end but only downstream. So I am thinking of integrating by multiplying the speed and density by drawing a line at the exit of the nozzle with CFD-POST. And this method seems complex Are there any ways to calculate mass flow rate? I'd really appreciate it if you could let me know Last edited by ChanHoPark; July 10, 2023 at 11:20.

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July 19, 2023, 11:00		#2
zacko Senior Member Daniel Join Date: Feb 2017 Location: Germany Posts: 135 Rep Power: 8	How does your setup look. Usually use the function at your desired face: massFlow()@Nozzle Outlet

July 19, 2023, 22:43		#3
ChanHoPark New Member ChanHoPark Join Date: May 2023 Posts: 2 Rep Power: 0	I solved the problem. Momentum was obtained at the nozzle exit using interpolate in Tecplot rather than in SU2. This momentum average was multiplied by the area to give the mass flow rate. thank you

August 25, 2023, 04:52		#4
Gmensofi New Member Join Date: Aug 2023 Posts: 1 Rep Power: 0	By dividing the volume flow rate by the fluid's mass density,, one may determine the mass flow rate. The volume flow rate is derived by multiplying the cross-sectional vector area, A, by the flow velocity of the mass components. dumb ways to die