Hi all, We have been working lately on the addition of some inertia to the particles, in the attached file you can see some preliminary results. We apply in each time step a mean displacement to each particle following the rules of brownian motion as well as keeping the previous velocity multiplied by a inertia factor, this way the particle movement stops being pure random. Does it has sense for you? x(t)=(Inertia factor)*(v(t)*timestep) + (Brownian Motion) Regards