to calculate mass flow transported through a channel

raunakjung · January 7, 2018, 09:53

I am carrying out a three-dimensional transient simulation where there is a periodic flow of fluid through a channel.

I want to calculate total mass transported through feedback channel per cycle.

How to calculate it in CFD post ?

Thank you

piu58 · January 7, 2018, 11:38

You can use the velocity through every surface of all boundary elements at the end of the channel. The data is in the <lastTime>/U file. Using this you may integrate the flow and therewith the mass transfer.

If that ist to cumbersome for you, you may generate an equidistant grid of velocity using the sample tool and the sampleDict file.

raunakjung · January 9, 2018, 02:49

thank you for your answer. I am looking at integrating the flow.
Can you elaborate on how to find required velocity?

To find average velocity through the plane which CFD post function is used. area(velocity) or areaAve(velocity) or only the perpendicular component of velocity is used.

Thank you

January 7, 2018, 09:53	to calculate mass flow transported through a channel	#1
raunakjung Senior Member raunak jung pandey Join Date: Jun 2016 Posts: 102 Rep Power: 10	I am carrying out a three-dimensional transient simulation where there is a periodic flow of fluid through a channel. I want to calculate total mass transported through feedback channel per cycle. How to calculate it in CFD post ? Thank you

January 7, 2018, 11:38		#2
piu58 Senior Member Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15	You can use the velocity through every surface of all boundary elements at the end of the channel. The data is in the <lastTime>/U file. Using this you may integrate the flow and therewith the mass transfer. If that ist to cumbersome for you, you may generate an equidistant grid of velocity using the sample tool and the sampleDict file. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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January 9, 2018, 02:49		#3
raunakjung Senior Member raunak jung pandey Join Date: Jun 2016 Posts: 102 Rep Power: 10	thank you for your answer. I am looking at integrating the flow. Can you elaborate on how to find required velocity? To find average velocity through the plane which CFD post function is used. area(velocity) or areaAve(velocity) or only the perpendicular component of velocity is used. Thank you