Learning Forum

[ehkh]

Hi,

I would like to know if there is a method to check the output of my UDFs before compiling and loading it into in Fluent. which editor or compiler should I use?

I have tried to compile my UDFs in Visual Studio but it was unable to define some variables such as 'real', the reason is that Fluent uses a C programming based Language, but not exactly c language, The way to define functions and variables is different.

I appreciate if you advice me how can I check the output of my UDF so I can modify it based on the results that I am looking at.

 

Thanks,

Esra'a

[Rob]

Compilers are covered in the Installation section, and we're using VS 2017 at the moment. You can edit in there or (as I do) use Notepad++ as it's easy to see what's commented, nested etc. 

Not sure why you can't define something as real, it's a standard C command? 

[ehkh]

Hi,

 

Thanks for your reply.

I can edit mu UDF in VS2017 or Notepad, but unable to see its output on VS.

I followed up the following procedure described in the following link to compile it, but its not successful !!

https://www.quora.com/How-do-I-do-Pure-C-programming-with-Visual-Studio-2017-I-want-to-relearn-C/answer/Sergey-Zubkov-1

Could you please advice me if there are different method tho check the output of UDF.

Thanks

[DrAmine]

What do you mean with output? If Fluent dependent the UDF should be executed at least once in Fluent.

[ehkh]

I am using a UDF to apply random heat flux at the bottom boundary in a natural convection problem, the results should look like rolls or plumes emitted from the bottom layer as in figure 6 in this paper attached here:

https://www.sciencedirect.com/science/article/pii/S0017931015003269

BUT I didn't get any change in temp, that could mean, my UDF is either returning a value of zero or constant heat flux.

What I need to know is how to check the values of heat flux that my UDF return before compiling and running it into fluent.

 

Thanks

[ehkh]

Hi,

I found out how to do check the values returned by my UDF. I am posting here for other student who are facing the same issue.

I did that by post-processing the results after one iteration and using a xy plot of bottom boundary coordinated vs. heat flux! This shows me the values returned by my UDF is correct.

 

[DrAmine]

Nice. Always store in an UDM for visualization too.