How to calculate time derivatives in ANSYS Fluent

PeterShi · July 8, 2020, 15:18

Dear Fluent users,

I wonder how can I calculate time derivatives in ANSYS Fluent? For example, I want to compute dp/dt and export it as an independent variable for postprocessing. Is there any way to do it in Fluent?

Thank you very much in advance.

Best regards,
Peter

rupak504 · July 8, 2020, 17:52

Normally derivatives are not saved in Fluent. you can always use UDF and save it in UDM and retrieve it later.

PeterShi · July 8, 2020, 18:00

Quote:

Originally Posted by rupak504

Normally derivatives are not saved in Fluent. you can always use UDF and save it in UDM and retrieve it later.

Hello Lolita,

Thank you. Do you happen to have a UDF to save time derivatives that you can share?

Best regards,
Peter

rupak504 · July 10, 2020, 16:19

Quote:

Originally Posted by PeterShi

Hello Lolita,

Thank you. Do you happen to have a UDF to save time derivatives that you can share?

Best regards,
Peter

you can always find online, even on this forum, use the search button, and proper keywords.

July 8, 2020, 15:18	How to calculate time derivatives in ANSYS Fluent	#1
PeterShi Senior Member Peter Shi Join Date: Feb 2017 Location: Davis Posts: 102 Rep Power: 9	Dear Fluent users, I wonder how can I calculate time derivatives in ANSYS Fluent? For example, I want to compute dp/dt and export it as an independent variable for postprocessing. Is there any way to do it in Fluent? Thank you very much in advance. Best regards, Peter

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July 8, 2020, 17:52		#2
rupak504 Senior Member Lolita Join Date: Aug 2016 Posts: 118 Rep Power: 10	Normally derivatives are not saved in Fluent. you can always use UDF and save it in UDM and retrieve it later.