Using UDF for inlet mass flow

Avni · March 26, 2019, 11:38

Hi guys, how can I write a UDF for an inlet mass flow boundary condition using another mass flow outlet condition.

Simultaneously , I want to calculate the mass flow from the 1st boundary condition and transfer it to the 2nd boundary condition I set.

upeksa · March 27, 2019, 05:47

You can use both scheme and UDF.

For velocity inlet, for example, you can write:

(rpsetvar 'v_inlet (pick-a-real "/report/surface-integrals/mass-weighted-avg inlet () velocity-magnitude no"))

where "inlet" is the name of your boundary condition, and v_inlet the name of your scheme variable.

and in your UDF, use:
real your_variable = RP_Get_Real("v_inlet")

Best regards.

March 26, 2019, 11:38	Using UDF for inlet mass flow	#1
Avni New Member TheAnswer Join Date: Sep 2017 Posts: 8 Rep Power: 8	Hi guys, how can I write a UDF for an inlet mass flow boundary condition using another mass flow outlet condition. Simultaneously , I want to calculate the mass flow from the 1st boundary condition and transfer it to the 2nd boundary condition I set.

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March 27, 2019, 05:47		#2
upeksa Member Join Date: Jul 2013 Posts: 80 Rep Power: 12	You can use both scheme and UDF. For velocity inlet, for example, you can write: (rpsetvar 'v_inlet (pick-a-real "/report/surface-integrals/mass-weighted-avg inlet () velocity-magnitude no")) where "inlet" is the name of your boundary condition, and v_inlet the name of your scheme variable. and in your UDF, use: real your_variable = RP_Get_Real("v_inlet") Best regards.