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Setting velocity UDF at outlets

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Old   July 14, 2021, 09:43
Default Setting velocity UDF at outlets
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sofia
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I have a coronary artery and I am trying to implement a UDF of pressure in the inlet (pressure-inlet type) and a velocity profile in the outlets (mass-flow-outlet type). I understand that velocity and mass flow rate are different things, but the profile shape is the same (just different magnitudes).


This approach is inspired by Fig. 4 of an article (https://doi.org/10.1080/10255842.2014.921682).


I can implement the inlet pressure, but I cannot define the outlet velocity... the closest is mass flow rate which I selected.


When I run the calculation, Fluent returns the following error:


Error: / (divide): invalid argument [1]: wrong type [not a number] Error Object: inf.



I have tried doing the opposite (inlet velocity and outlet pressures) and there are no errors...



Any help? Thanks in advance
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Old   July 15, 2021, 14:18
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Not sure what your error is. Check your UDF. But you can specify the velocity if you use a velocity inlet type BC at an outlet. The BC type may be named an inlet but it is a fixed velocity constraint.
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