How to calculate time derivatives in ANSYS Fluent

PeterShi · July 8, 2020, 14:18

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, 16:52

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, 17:00

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, 15:19

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, 14:18	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to export time series of variables for one point?	mary mor	OpenFOAM Post-Processing	8	July 19, 2017 10:54
Can you help me with a problem in ansys static structural solver?	sourabh.porwal	Structural Mechanics	0	March 27, 2016 17:07
Floating point exception error	lpz_michele	OpenFOAM Running, Solving & CFD	53	October 19, 2015 02:50
IcoFoam parallel woes	msrinath80	OpenFOAM Running, Solving & CFD	9	July 22, 2007 02:58
Could anybody help me see this error and give help	liugx212	OpenFOAM Running, Solving & CFD	3	January 4, 2006 18:07

July 8, 2020, 16:52		#2
rupak504 Senior Member Lolita Join Date: Aug 2016 Posts: 115 Rep Power: 9	Normally derivatives are not saved in Fluent. you can always use UDF and save it in UDM and retrieve it later.