Learning Forum

[Jeroen]

Hi,

 

I am trying to get the species mass and molar fractions for my continuous gas phase into a UDF for DEFINE_DPM_HEAT_MASS(). According to the manual, this can be done by using the following.

Pdf_Yi(c, t, n) or Pdf_XY(c,t,x,y)

In order to use these expressions "pdf_props.h" must be included. Hooking the UDF causes no issues, however upon running my model the simulation crashes when reaching the DPM Iteration. More specifically: it crashes because of these functions.

I am using Fluent version 19.3. Is there any other way to get these fractions for a species transport model? Or how do i resolve this issue?

 

Kind regards,

Jeroen

[DrAmine]

Are you working with pdf based combustion model or just using species model?

[Jeroen]

Im am just using a species model, no combustion involved here

[Rob]

Then have a look for the species macros, the pdf ones you're using relate to a combustion model. 

[Jeroen]

I got it to work by using c->yi[ns]

previously this did not work because there was an error in my cphase_state_t variable, it should have been:

cphase_state_t *c = &(tp->cphase[0]);

 

Thanks for your help

[DrAmine]

The example in the manual does cover it.