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You can set paramater of number of particles, movoment velocity and the parameter of force field function. In this simulator, the positions are calculated recurrently by this function.

Position_t+1(x,y)=v*Force(x,y)+Position_t(x,y)

Force(x,y)=Σ(i≠j) v*Vector_ij(x,y)*Log(Distance_ij/d)/(Distance_ij/d)

Vector_ij(x,y)=Position_t,j(x,y)-Position_t,i(x,y)

Distance_ij=|Vector_ij|

You can see the particles gathering to a circle formation. It is because all particles attract each other to the distance of d value, however, particles nearer than d value are distracted.