How to create UDF file generally?

GenD · October 12, 2018, 16:54

Hi,
I've been learning ANSYS Fluent and Mesh for some time and now I've reached the point, where I want to define my own UDF file, but I don't know how to do this at all.
First case is that C++ is a familiar language to me and I want to use it in coding UDF. Is it possible? The second case is far more complex. I don't know how to start writing code, in which programme, how to connect c++ file and ANSYS and is there any clue/scheme that I can follow to write code correctly for ANSYS? So basically I need step-by-step explanation.

Is there anybody that can help me in this manner? Or have some materials, which I can learn it from? Anything. I appreciate every help.

Thanks in advance.

moh_zain · October 13, 2018, 07:47

Hi see http://users.ugent.be/~mvbelleg/fludf-12-0.pdf

you will find good help

GenD · October 13, 2018, 08:12

I don't know, if I understand correctly, so correct me. The only way to define UDF is by using C language?

GenD · October 13, 2018, 19:31

I've found the answer to my question. UDF can be written in C++. After searching whole the internet, I've found everything in most obvious place, ANSYS Help. I put here the link for the ones that will look for it in future. It's like the instruction given here by moh_zain, but for the latest version 19.2.

https://ansyshelp.ansys.com/account/...f/flu_udf.html

Roh · October 14, 2018, 02:40

UDF should be written in C or C++ standard?

gearboy · October 14, 2018, 21:48

Quote:

Originally Posted by GenD

Hi,
I've been learning ANSYS Fluent and Mesh for some time and now I've reached the point, where I want to define my own UDF file, but I don't know how to do this at all.
First case is that C++ is a familiar language to me and I want to use it in coding UDF. Is it possible? The second case is far more complex. I don't know how to start writing code, in which programme, how to connect c++ file and ANSYS and is there any clue/scheme that I can follow to write code correctly for ANSYS? So basically I need step-by-step explanation.

Is there anybody that can help me in this manner? Or have some materials, which I can learn it from? Anything. I appreciate every help.

Thanks in advance.

Here is a tool that use C++ language to code UDF, compatible with Win32 API.
Please see https://vcUdfStudio.bitbucket.io

Roh · October 15, 2018, 02:47

Or maybe he wants to see this topic:

What compilers can we use in Ansys Fluent to compile our UDF?

Thanks to gearboy for useful tool.

GenD · October 15, 2018, 08:16

Thanks for all your help.

I've started to read the Manual for the purpose of creating UDF file, but... I got a problem. As you can see on the image I attached, source code don't read the udf.h. I have even put this file in local folder of my_adjust.c. Still nothing. Any thoughts?

moh_zain · October 16, 2018, 02:35

read chapter 4 and 5 depending on which udf you use

October 12, 2018, 16:54	How to create UDF file generally?	#1
GenD New Member GenD Join Date: Nov 2017 Posts: 23 Rep Power: 9	Hi, I've been learning ANSYS Fluent and Mesh for some time and now I've reached the point, where I want to define my own UDF file, but I don't know how to do this at all. First case is that C++ is a familiar language to me and I want to use it in coding UDF. Is it possible? The second case is far more complex. I don't know how to start writing code, in which programme, how to connect c++ file and ANSYS and is there any clue/scheme that I can follow to write code correctly for ANSYS? So basically I need step-by-step explanation. Is there anybody that can help me in this manner? Or have some materials, which I can learn it from? Anything. I appreciate every help. Thanks in advance. Sidique likes this.

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October 13, 2018, 07:47		#2
moh_zain Member mohamed Join Date: Apr 2016 Posts: 34 Rep Power: 10	Hi see http://users.ugent.be/~mvbelleg/fludf-12-0.pdf you will find good help

October 13, 2018, 08:12		#3
GenD New Member GenD Join Date: Nov 2017 Posts: 23 Rep Power: 9	I don't know, if I understand correctly, so correct me. The only way to define UDF is by using C language?

October 13, 2018, 19:31		#4
GenD New Member GenD Join Date: Nov 2017 Posts: 23 Rep Power: 9	I've found the answer to my question. UDF can be written in C++. After searching whole the internet, I've found everything in most obvious place, ANSYS Help. I put here the link for the ones that will look for it in future. It's like the instruction given here by moh_zain, but for the latest version 19.2. https://ansyshelp.ansys.com/account/...f/flu_udf.html

October 14, 2018, 02:40		#5
Roh Senior Member Join Date: Sep 2017 Posts: 130 Rep Power: 9	UDF should be written in C or C++ standard?

October 15, 2018, 02:47		#7
Roh Senior Member Join Date: Sep 2017 Posts: 130 Rep Power: 9	Or maybe he wants to see this topic: What compilers can we use in Ansys Fluent to compile our UDF? Thanks to gearboy for useful tool.

October 16, 2018, 02:35		#9
moh_zain Member mohamed Join Date: Apr 2016 Posts: 34 Rep Power: 10	read chapter 4 and 5 depending on which udf you use