Tracking mass flow rate with position

prij · March 26, 2016, 17:21

Hi,

If I want to track the mass flow rate along the axis of a converging-diverging nozzle and want to find out the value of mass flow rate at a particular distance from the throat, how do I get it? I know that I can generate a curve for mass flow rate vs distance in the results section. But how do I interpolate at a particular point. I want to determine even the minute changes in the mass flow rate (to the order of 2nd decimal change in distance).

Thanks.

`e` · March 30, 2016, 17:44

For determining mass flow rates for each cross-section of your nozzle you could use the local velocity and calculate the cross-sectional area. However, of course the resolution of this approach is limited by your mesh size. For finding interpolated values, have a read of this post and check their UDFs.

March 26, 2016, 17:21	Tracking mass flow rate with position	#1
prij New Member Join Date: Feb 2016 Posts: 7 Rep Power: 10	Hi, If I want to track the mass flow rate along the axis of a converging-diverging nozzle and want to find out the value of mass flow rate at a particular distance from the throat, how do I get it? I know that I can generate a curve for mass flow rate vs distance in the results section. But how do I interpolate at a particular point. I want to determine even the minute changes in the mass flow rate (to the order of 2nd decimal change in distance). Thanks.

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March 30, 2016, 17:44		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	For determining mass flow rates for each cross-section of your nozzle you could use the local velocity and calculate the cross-sectional area. However, of course the resolution of this approach is limited by your mesh size. For finding interpolated values, have a read of this post and check their UDFs.