Learning Forum

[Adwait Mahajan]

Getting parse error in UDF while interpreting. Please let me know what is the issue. Thank you.

[Rob]

Where did you get that UDF code? 

[Adwait Mahajan]

From one of the seniors at my institute.

[Rob]

Did it work when they tried it? 

[Adwait Mahajan]

 

Yes, it did work for him. But I got a bit editted version of his code. I got this through my professor. The code originally didn’t have the “#include ” . I am guessing he had used some more libraries. 

 

[Adwait Mahajan]

Is there any specific library to which the command "local" belongs to?

[Rob]

It's more that it doesn't look like a UDF as it's not written in C. We (I checked with another colleague) also don't know what it's written in, as it's not Scheme or TUI script. 

[Adwait Mahajan]

Okay Rob. Thanks a lot for helping me out. Will try and figure out the code from scratch by myself.

Can you atleast vouch for the Fluent specific commands he has used like "FLUENT_CELL_FIX", "FLUENT_CELL_NUMBER", etc. or maybe direct me in the direction of Fluent specific C commands library.

[Rob]

UDFs are covered in the Customisation manual. Neither of us recognised FLUENT_CELL_FIX as a macro, and it's not in any of the 2024R1 manuals as far as I can tell. 

Start by figuring out what you want to the code to do. If the "negative pressure" part is an attempt to limit the pressure then there may already be tools in Fluent that do the same job. 

[Adwait Mahajan]

Yes. That is what I have to do. But at every iteration. As pressure goes below atmospheric pressure I have to set it to atmospheric pressure.

[Rob]

Why? Pressure may drop below atmospheric pressure and fixing the solver like that may cause unforeseen side effects.