how to input an experimental data of rotational deformation as a UDF?

denis Kim · May 28, 2020, 08:24

Hi everyone.

i had rotational test data(angular displacement).

For exact comparison of experiment and simulation(Fluent),

i want to apply directly the experimental data to Fluent using UDF.

Anyone who have experience or know how to deal with it,

please help me...

I really appreciate it in advance!

vinerm · May 28, 2020, 09:38

Is it angular displacement or angular deformation? Both are different. And you don't need a UDF for this.

denis Kim · May 28, 2020, 11:52

very thank you for yr quick reply!

i have a angular displacement from the encoder in the experiment, not deformation(typo!!).
No need for UDF???
i want to make a rotation of a cylindrical structure using the initial angular displacement from the experiment. So, UDF should be needed i think.

i hope hearing from you soon.

vinerm · May 28, 2020, 12:11

UDF is not required. You can use Profile file. The type of profile depends on the type of motion. If the cylinder is rotating about its own axis, then a simple transient profile will suffice.

denis Kim · May 28, 2020, 12:34

Thanks again for reply!

you right! Rotational motion with harmonic period is needed in the simulation!

Does profile means the "time-angle" data?

If right, and then if i make a format of angular profile to be inserted, can you

explain how to use it?

Best regards,

Kim

vinerm · May 28, 2020, 12:44

You need to use transient profile. Look at the following

https://www.afs.enea.it/project/nept...ug/node225.htm

Do note that there is no option to provide displacement to Fluent. You have to convert it into speed and provide speed as profile.

denis Kim · August 6, 2020, 00:41

it doesn't work...

anybody who can help me?

Please...

AlexanderZ · August 6, 2020, 00:57

you should explain your problem if you want to get help

denis Kim · August 6, 2020, 03:35

By using the profile (.prof), is it available to use the experiemntal rotational data into the analysis for same motion in the Fluent?
according to the venermn, velocity profile should be inputted, not rotational angle. but the result in the simulation is extremely larger than experimental data.

May 28, 2020, 08:24	how to input an experimental data of rotational deformation as a UDF?	#1
denis Kim New Member Ki Jong Kim Join Date: Oct 2018 Posts: 12 Rep Power: 7	Hi everyone. i had rotational test data(angular displacement). For exact comparison of experiment and simulation(Fluent), i want to apply directly the experimental data to Fluent using UDF. Anyone who have experience or know how to deal with it, please help me... I really appreciate it in advance!

May 28, 2020, 09:38	Data	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	Is it angular displacement or angular deformation? Both are different. And you don't need a UDF for this. __________________ 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.

May 28, 2020, 11:52	data; angular displacement	#3
denis Kim New Member Ki Jong Kim Join Date: Oct 2018 Posts: 12 Rep Power: 7	very thank you for yr quick reply! i have a angular displacement from the encoder in the experiment, not deformation(typo!!). No need for UDF??? i want to make a rotation of a cylindrical structure using the initial angular displacement from the experiment. So, UDF should be needed i think. i hope hearing from you soon.

May 28, 2020, 12:11	Profile	#4
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	UDF is not required. You can use Profile file. The type of profile depends on the type of motion. If the cylinder is rotating about its own axis, then a simple transient profile will suffice. denis Kim likes this. __________________ 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.

May 28, 2020, 12:34	Angular profile	#5
denis Kim New Member Ki Jong Kim Join Date: Oct 2018 Posts: 12 Rep Power: 7	Thanks again for reply! you right! Rotational motion with harmonic period is needed in the simulation! Does profile means the "time-angle" data? If right, and then if i make a format of angular profile to be inserted, can you explain how to use it? Best regards, Kim

May 28, 2020, 12:44	Transient Profile	#6
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	You need to use transient profile. Look at the following https://www.afs.enea.it/project/nept...ug/node225.htm Do note that there is no option to provide displacement to Fluent. You have to convert it into speed and provide speed as profile. __________________ 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.

August 6, 2020, 00:41	transient profile	#7
denis Kim New Member Ki Jong Kim Join Date: Oct 2018 Posts: 12 Rep Power: 7	it doesn't work... anybody who can help me? Please...

August 6, 2020, 00:57		#8
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	you should explain your problem if you want to get help __________________ best regards ****************************** press LIKE if this message was helpful

August 6, 2020, 03:35	Input of experimental data into analysis in Fluent	#9
denis Kim New Member Ki Jong Kim Join Date: Oct 2018 Posts: 12 Rep Power: 7	By using the profile (.prof), is it available to use the experiemntal rotational data into the analysis for same motion in the Fluent? according to the venermn, velocity profile should be inputted, not rotational angle. but the result in the simulation is extremely larger than experimental data.

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