CFD-Post

Pavelko · April 7, 2011, 14:12

Hello all,

I have a transient problem. How can I calculate the total mass/volumetric flow rate?

Thanks.

ghorrocks · April 7, 2011, 18:08

Do you mean integrate the mass flow rate over time to give a total mass? (or total volume)

In the solver use a monitor point to output the flow rate. Export the monitor point data and do the integration in Excel/matlab/whatever.

In CFD-Post, similarly load each timestep you saved and export the flow rate. Do the time integration in another package like excel/matlab.

Pavelko · April 8, 2011, 03:51

Thanks for your response,

But I can not find flow rate in monitor point menu, I can see only velocity.
The same is in CFD-Post...

Thanks

ghorrocks · April 8, 2011, 06:21

Use a CEL expression, such as massflow()@Location.

Pavelko · April 8, 2011, 08:20

Thank you very much !

April 7, 2011, 14:12	CFD-Post	#1
Pavelko Member Pavelistyj Join Date: Jul 2010 Posts: 42 Rep Power: 16	Hello all, I have a transient problem. How can I calculate the total mass/volumetric flow rate? Thanks.

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April 7, 2011, 18:08		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,931 Rep Power: 145	Do you mean integrate the mass flow rate over time to give a total mass? (or total volume) In the solver use a monitor point to output the flow rate. Export the monitor point data and do the integration in Excel/matlab/whatever. In CFD-Post, similarly load each timestep you saved and export the flow rate. Do the time integration in another package like excel/matlab.

April 8, 2011, 03:51		#3
Pavelko Member Pavelistyj Join Date: Jul 2010 Posts: 42 Rep Power: 16	Thanks for your response, But I can not find flow rate in monitor point menu, I can see only velocity. The same is in CFD-Post... Thanks

April 8, 2011, 06:21		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,931 Rep Power: 145	Use a CEL expression, such as massflow()@Location.

April 8, 2011, 08:20		#5
Pavelko Member Pavelistyj Join Date: Jul 2010 Posts: 42 Rep Power: 16	Thank you very much !