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

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Old   March 26, 2018, 16:13
Default Macros for cell volume particle is in DPM (fluent 18.1)
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sunil kumar
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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
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Old   March 27, 2018, 11:27
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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.
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Old   March 28, 2018, 10:08
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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)
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Old   March 28, 2018, 10:47
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This does not work because you are not telling what c0 is.
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Old   March 28, 2018, 10:49
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I have put cell_t c0; which tells what c0 is. is that wrong there?
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Old   March 28, 2018, 10:52
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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.
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Old   March 28, 2018, 10:53
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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?
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Old   March 28, 2018, 10:57
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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.
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Old   March 28, 2018, 11:02
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would cell_t c0 = TP_CELL(tp); specify the cell the particle is in?
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Old   March 28, 2018, 11:16
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Did you check the table?
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Old   March 28, 2018, 11:17
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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
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Old   March 28, 2018, 11:19
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Did you see the text next to "TP_CELL(tp)" in that table? It answers almost literally what you are asking me...
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