Mass Flow Rate Custom Field Function

AJoubert · March 22, 2013, 12:39

Hi everyone, I just have a pretty quick and simply question,

I am using Ansys Fluent 13.0 and I am trying to create a custom field function for mass flow rate in order to use it in addition to another custom field function. My question is where can I find the area value that I need for this? I know mass flow rate is rho*V*A but the only areas I can find are related to the cell faces and therefore gives me the incorrect mass flow rate.

I know I can find mass flow rate under the monitors, reports, and xy plots but I specifically need to write it as a custom field function for my purposes. If anyone can help me with this small problem I would greatly appreciate it.

Yanlong Li · March 23, 2013, 06:16

Maybe you should use UDF or UDM, I donot think you can do this by custome user define funciton.

AJoubert · March 23, 2013, 09:50

Thanks Yanlong, I actually managed to find a slightly less direct way to do it. I just calculated the mass flow rate with a surface integral and then made a custom field function to divide this calculated value by the instantaneous density and axial velocity in order to give me the area at any point along the flow and simply defined this field function as "area"

March 22, 2013, 12:39	Mass Flow Rate Custom Field Function	#1
AJoubert New Member Andre Joubert Join Date: Mar 2013 Posts: 4 Rep Power: 13	Hi everyone, I just have a pretty quick and simply question, I am using Ansys Fluent 13.0 and I am trying to create a custom field function for mass flow rate in order to use it in addition to another custom field function. My question is where can I find the area value that I need for this? I know mass flow rate is rhoVA but the only areas I can find are related to the cell faces and therefore gives me the incorrect mass flow rate. I know I can find mass flow rate under the monitors, reports, and xy plots but I specifically need to write it as a custom field function for my purposes. If anyone can help me with this small problem I would greatly appreciate it.

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March 23, 2013, 06:16		#2
Yanlong Li Member Yanlong Li Join Date: Jan 2013 Location: BeiJing Posts: 47 Rep Power: 13	Maybe you should use UDF or UDM, I donot think you can do this by custome user define funciton.

March 23, 2013, 09:50		#3
AJoubert New Member Andre Joubert Join Date: Mar 2013 Posts: 4 Rep Power: 13	Thanks Yanlong, I actually managed to find a slightly less direct way to do it. I just calculated the mass flow rate with a surface integral and then made a custom field function to divide this calculated value by the instantaneous density and axial velocity in order to give me the area at any point along the flow and simply defined this field function as "area"