Thank you for your quick answer.nI am still confused.nHow do I create several hard copy images and of different steps? In the Particle Tracks of the Results section of FLUENT I see only one freezed image of the particles (not even sure of which point in time of the simulation).nnAnd if you suggest using CFD-Post I assume the post-processing tools of FLUENT do not allow to visualize the particle tracking? All this changing of programs is quite annoying. Also, I know how to export the particle tracks at the end of the simulation (under file as you said), but how do I export it *during* the simulation? In create under Activities of the Solution, I cannot select the option:nAnd with solution animation I obtain files with an extension that seems it cannot be read by FLUENT or CFD-Postn