Learning Forum

[Dana Moses]

hi!

Im writing a UDF and getting this error-

P_USER_REAL: undeclared variable

this is the UDF:

include "udf.h"
#include "dpm.h"

DEFINE_DPM_SCALAR_UPDATE(boron_scalar, c, t, initialize, p)
{
    if (initialize)
    {
        P_USER_REAL(p,0)=0.1;
    }
    else
    {
        P_USER_REAL(p,0)=P_USER_REAL(p,0);
    }
}

 

I already activeted the discreat phase model and define Number of scalars as "1" in User Variables in the discreat phase model tab.
Asking kindly for any help!

 

[Rob]

Is it a real, integer, array etc? 

[Dana Moses]

p_user_real is a macro - "Particle values can be stored in an array associated with the Tracked_Particle (accessed with the macro P_USER_REAL(p,i))" (from Fluent UDF manual)

[Rob]

You sure about that?  https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_udf/flu_udf.html  

[Dana Moses]

yes :)

Unfortunatly I cant access the link you attached for some reason - can you elaborate?

[Rob]

Are you REALLY sure?  

Click on Help in Fluent and have a look for  DEFINE_DPM_SCALAR   There's a very good reason we don't like third party copies of the documentation, not just copyright. 

[Dana Moses]

I sure understand. can you guide me to where Help is in fluent softwhere? I'm afraid I don't know where to look :)

[Rob]

Open any panel in the Fluent software, and look for the button towards the bottom left of that panel. It's labelled as "Help" to guide you! :)   You may want to look into the Learning section on here, and in Fluids you'll find some courses on how to use Fluent: do those and then the tutorials you'll find in the Help system.