Approach to learning UDF programming?

CFD-student · December 12, 2011, 07:02

Hi,
Im currently studying fluid dynamics, transport processes etc. Furthermore I have basic knowledge about handling fluent and the ANSYS workbench. However to further improve my ability in simulation with fluent I feel that I need to be able to write my own UDF:s, my programming knowledge is limited to MatLab. Therefore I would be very if happy if someone could suggest an approach to lear how to write UDF:s in Fluent? I understand that i probably must learn C? Which books or resources would you recommend for that?

Best regards!
CFD-student

pghoseju · December 13, 2011, 00:02

I am currently working on spray modelling(axi-symmetry) by using species transportation+DPM in Fluent 13.0. i want to know that
1.Species transport: diffusion energy source should be disabled/enabled?
2.In injection, what is the relation between the point properties
a.Diameter
b.Velocity magnitude
c.Radius
d.Total flow rate
3. In boundary condition: inlet: species: what should be the mass fraction of the fuel .0 or1 or inbetween0-1.

Best regards!
CFD-student
Prakash Ghose

sreerajvarma · July 9, 2014, 12:17

Can anyone tell how to start learning to write UDF's? I tried reading the Fluent user manual but didn't get it. So kindly help me out

Best Regards
Sreeraj Varma

GM_XIII · July 10, 2014, 06:45

A good start would be learning the basics of C programming. From that point here in this forum there are tons of examples and cases and of course is just a matter of practice.

macfly · July 16, 2014, 15:37

And the basics of C programming are found... in Appendix A of the Ansys Fluent UDF Manual!

You need to read the Fluent UDF manual, not the Fluent User's guide.

There is no better source than the UDF manual in order to learn the basics, you have to put some time into it.

homay95 · May 6, 2020, 04:54

Hello. Do you how I could write a UDF for velocity slip and temperature jump boundary condition for a liquid-solid interface?
Thanks for any help

zhangdongjie · January 6, 2021, 21:32

Quote:

Originally Posted by homay95

Hello. Do you how I could write a UDF for velocity slip and temperature jump boundary condition for a liquid-solid interface?
Thanks for any help

Hello, may I have your UDF? Thank you very much。1248385182@qq.com

December 12, 2011, 07:02	Approach to learning UDF programming?	#1
CFD-student New Member Join Date: Dec 2011 Location: Sweden Posts: 13 Rep Power: 14	Hi, Im currently studying fluid dynamics, transport processes etc. Furthermore I have basic knowledge about handling fluent and the ANSYS workbench. However to further improve my ability in simulation with fluent I feel that I need to be able to write my own UDF:s, my programming knowledge is limited to MatLab. Therefore I would be very if happy if someone could suggest an approach to lear how to write UDF:s in Fluent? I understand that i probably must learn C? Which books or resources would you recommend for that? Best regards! CFD-student

December 13, 2011, 00:02	spray modelling	#2
pghoseju Member Prakash Ghose Join Date: Dec 2011 Posts: 34 Rep Power: 14	I am currently working on spray modelling(axi-symmetry) by using species transportation+DPM in Fluent 13.0. i want to know that 1.Species transport: diffusion energy source should be disabled/enabled? 2.In injection, what is the relation between the point properties a.Diameter b.Velocity magnitude c.Radius d.Total flow rate 3. In boundary condition: inlet: species: what should be the mass fraction of the fuel .0 or1 or inbetween0-1. Best regards! CFD-student Prakash Ghose

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July 9, 2014, 12:17		#3
sreerajvarma New Member Sreeraj Varma Join Date: Jun 2014 Posts: 8 Rep Power: 11	Can anyone tell how to start learning to write UDF's? I tried reading the Fluent user manual but didn't get it. So kindly help me out Best Regards Sreeraj Varma

July 10, 2014, 06:45		#4
GM_XIII Member David Join Date: Aug 2012 Posts: 48 Rep Power: 13	A good start would be learning the basics of C programming. From that point here in this forum there are tons of examples and cases and of course is just a matter of practice.

July 16, 2014, 15:37		#5
macfly Senior Member François Grégoire Join Date: Jan 2010 Location: Canada Posts: 392 Rep Power: 17	And the basics of C programming are found... in Appendix A of the Ansys Fluent UDF Manual! You need to read the Fluent UDF manual, not the Fluent User's guide. There is no better source than the UDF manual in order to learn the basics, you have to put some time into it.

May 6, 2020, 04:54		#6
homay95 Member Homayoon sohrabi Join Date: May 2020 Posts: 56 Rep Power: 5	Hello. Do you how I could write a UDF for velocity slip and temperature jump boundary condition for a liquid-solid interface? Thanks for any help