How to follow the path of a particle in DPM?
 

I want to write a UDF, that, when there is an impact on a wall, the coordinates of the centroids in the particle path which made that impact are shown.

Do you know how to loop over particle path in a DEFINE_ON_DEMAND? And how to retrieve the particle ID of each path?

Thanks for helping.

You ask for a solution using DEFINE_ON_DEMAND, but I would instead use DEFINE_DPM_BC (or maybe DEFINE_DPM_SCALAR_UPDATE, depending on what you exactly want).
In that case, p is the pointer to the particle, p->part_id is the ID and P_POS(p) is the position of the particle.

If with "centroid" you mean the center of the face on which the particle collided, you would access it using the "f" in the DEFINE_DPM_BC macro, and then F_CENTROID(x,f,t) would set the centroid of that face to variable x.

hey,
Did you find the answer to your question ??

I'm trying to do the same thing ..

Let me know please
Thanks