Thanks for your reply! We have figured out that DPM particles could be cooled down during the following flow. nBut we want to check the shape of the lumps that are transferred to DPM particles, as our experiment shows that the generated particles are long strip type rather than spherical. Is there any way we could output the vof lumps that have been transferred?nOn the other side, we just give up vof-to-dpm and only activate vof. But the vrml output and surface imprinting seem to be helpless to separate every small vof lumps separately during post-processing. We guess there should be a similar code applied by vof-to-dpm that can capture separate lumps and evaluate their velocity and volume.n