How to make intervals in an ANSYS Fluent user defined function UDF to describe three

Ahmed Saeed Mansour · June 2, 2020, 06:06

Hello, I have a plot shows the change of a quantity with time. How can we write a code in Fluent UDF to compile it ? I need a way to define the time intervals. From start to a specific moment, the quantity follows a specific relation, then it changes twice.
Thank you very much !

vinerm · June 2, 2020, 06:26

Do you want to provide this profile as input to Fluent? Then you don't need a UDF. Use transient Profile file.

Ahmed Saeed Mansour · June 3, 2020, 07:07

Hello, no it is not like that. It is a dynamic mesh simulation and the mesh motion has to follow this profile. So, the UDF is required I think to be used in Motion tab in the dynamic mesh setup. We do not have inlets or outlets in the simulation.
Thanks

vinerm · June 3, 2020, 07:16

Whether used at inlet/outlet or for moving mesh or dynamic mesh, it is an input to Fluent. So, you can use profile. No UDF is needed. Dynamic mesh works with profile.

https://www.afs.enea.it/project/nept...ug/node398.htm

Ahmed Saeed Mansour · June 4, 2020, 07:44

Okay, thank you sir! I am gonna try to understand the method.

June 2, 2020, 06:26	Input	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	Do you want to provide this profile as input to Fluent? Then you don't need a UDF. Use transient Profile file. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

June 3, 2020, 07:16	Transient Profile	#4
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	Whether used at inlet/outlet or for moving mesh or dynamic mesh, it is an input to Fluent. So, you can use profile. No UDF is needed. Dynamic mesh works with profile. https://www.afs.enea.it/project/nept...ug/node398.htm __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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June 3, 2020, 07:07		#3
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Hello, no it is not like that. It is a dynamic mesh simulation and the mesh motion has to follow this profile. So, the UDF is required I think to be used in Motion tab in the dynamic mesh setup. We do not have inlets or outlets in the simulation. Thanks

June 4, 2020, 07:44		#5
Ahmed Saeed Mansour Senior Member Have a nice time! Join Date: Feb 2016 Location: mech.eng.ahmedmansour@gmail.com Posts: 291 Rep Power: 11	Okay, thank you sir! I am gonna try to understand the method.