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DPM: UDF - loop over all particles

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Old   April 25, 2012, 01:56
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FORTRAN code UDF for FLUENT, I am 99% sure it is not possible. You will have to recode it in c/C++. Besides, If you are writing a UDF for FLUENT, usually you do not code every thing from continuity all the way to the slightest details in combustion. Use the FLUENT UDF manual. It really will guide you well.

As for openfoam, I dont have much experience. I have only tried a very small and simple pipe flow model at home. No where enough experience to provide help or advice.
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Old   April 25, 2012, 02:01
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Ok.

Yes I have started reading the UDF manual. Thanks for your advice.
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Old   April 25, 2012, 05:42
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@ADI : one more thing. It is possible to generate a virtual grid in C language and run the UFD code developed on that grid and to simultaneously run the FLUENT code (Continuity, mom, energy eqs) on the grid developed in GAMBIT/FLUENT?
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Old   July 13, 2012, 17:23
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High everybody,

I would like to loop over all particles and find their intraction with each other. However, this has to be done inside a UDF for DPM (e.g. Defiend_DPM_SCALAR_UPDATE). The compiler will go wrong as soon as I have one of the macros related for looping over the particles (e.g. begin_particle_cell_loop!).

Does anyone have any idea to resolve this situation?

Thank you.

Sean
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Old   April 11, 2015, 00:47
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Quote:
Originally Posted by Wikie View Post
Hi,

I still stuck at this problem. I'm always getting the same error message saying: "error C2198: 'bin_particles_in_cells' : too few arguments for call".
Can anybody help me please, I have to know the number of particles to continue my work.

Thanks,
wikie
hi Wikie
have you found any solution for that ? i stuck at this problem either, i am using Fluent v15.0, in v6.3.26 it works correctly, but in v15.0 no,
thank you
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Old   August 27, 2017, 19:34
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Hello, dear
Is there any way to count the Particles on Boundries over the time ?
how can I do it in the fluent? pls tell me the steps for it, and pls how can I know How many particles pass the Inlet in those ten seconds of Simulation in the fluent? 1000000000 thanks
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Old   August 14, 2018, 12:25
Default Solution: looping over all particles, calculating melt fraction
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Hi All,

Thank you for all your posts! I haven't read all the posts, so I'm not sure if a solution has been found. If not, here's some code I've written to count all of the particles and calculate the melt fraction. Note that I only have one injection so I didn't have to loop through them, as we done in the previous posts with Ilist.

DEFINE_ON_DEMAND(melt_percent_calc)
{
Injection *I;
Particle *p;

real particle_count = 0;
real melt_count = 0;
real melt_percent = 0;

I = Get_dpm_injections();

loop(p, I->p)
{
particle_count++;
if (TP_T(p) > Tmelt){
melt_count++;
}
if (TP_TIME(p) > time){
time = TP_TIME(p);
}
}

melt_percent = (melt_count/particle_count)*100;
Message("\n");
Message("Particle count: %g\n", particle_count);
Message("Melt count: %g\n", melt_count);
Message("Melt percent: %g\n", melt_percent);

}
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Old   June 17, 2020, 01:21
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Hello everybody,

I want to inject several particles using read a file in the DPM setting and finally get their positions.

I used the following UDF for writing the positions.

#include "udf.h"
#include "dpm.h"
DEFINE_ON_DEMAND(particles_position)
{

Domain *d;
Thread *t;
cell_t c;
d = Get_Domain(1);

Injection *I;
Particle *p;
I = Get_dpm_injections();

FILE *fp;

loop(p, I->p)
{

fp = fopen ("E:/aafinal/path/position.txt","a");

fprintf(fp, "%d %d %d \n", P_POS(p)[0], P_POS(p)[1], P_POS(p)[2]);

fclose(fp);

}

}
Despite the declaration variable I, I faced the error: I: undeclared variable.
Could anyone please guide me?

Thank you for your time and concern!
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Old   June 17, 2020, 02:11
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I also have another question. Should I use if-loop if I want to get positions in several specified times? Do you have any suggestions?

Thanks
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Old   June 17, 2020, 03:45
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Are you compiling it or interpreting it? Interpreter will not work for this scenario. As a compiled version, it would work fine. You don't need the following lines

#include "dpm.h"
Domain *d;
Thread *t;
cell_t c;
d = Get_Domain(1);

And open and close the file outside the loop, otherwise I/O will slow down the process significantly.
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Old   June 17, 2020, 05:38
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Many thanks for the reply.

I interpreted it.
Yes, you're right. There is no need to write the lines.

#include "udf.h"

DEFINE_ON_DEMAND(particles_position)
{

Injection *I;
Particle *p;
I = Get_dpm_injections();

FILE *fp;
fp = fopen ("E:/aafinal/path/position.txt","a");

loop(p, I->p)
{

fprintf(fp, "%d %d %d \n", P_POS(p)[0], P_POS(p)[1], P_POS(p)[2]);
}

fclose(fp);
}
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Old   June 17, 2020, 05:52
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You need to compile it. Interpreter won't work.
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