Macros for cell volume particle is in DPM (fluent 18.1)
 

Hello

I wanted to inquire what the macros is for the volume of the cell the particle is IN. I have tried using C_VOLUME(c,t) however I keep getting back an error illegal index, indirection not allowed

Can you show how you tried this? The macro is correct, by without context I can not see how you specified c and t, or even if you forgot to do that.

I have changed this to what I have included below however this still does not seem to be working.
cphase_state_t *c = &(tp->cphase[0]);
Thread *t = TP_CELL_THREAD(tp);
cell_t c0;
volume = C_VOLUME(c0,t)

This does not work because you are not telling what c0 is.

I have put cell_t c0; which tells what c0 is. is that wrong there?

You have told the compiler that c0 is a variable of the type "cell_t" (well done!). But you did not say the value of c0!

Fluent does not know which cell is c0! You still have to tell Fluent that you want c0 to be the cell that the particle is in.

That makes a lot of sense !!! that part was confusing me quite a bit how fluent knows which cell volume to calculate. How would I go about doing this?

There are some macros in the manual. Look in "Table 3.29: Macros for Particle Cell Index and Thread Pointer Defined in dpm_types.h" in the Fluent Customization Manual.

would cell_t c0 = TP_CELL(tp); specify the cell the particle is in?

Did you check the table?

Yes I got the macros from the table, from my best guess that should do the trick. I just wanted to make sure I wasn't wrong

Did you see the text next to "TP_CELL(tp)" in that table? It answers almost literally what you are asking me...