Volatile jam and flow fluctuation in counter flow of slender particles

We study the counter flow of slender particles on square lattice under periodic boundaries. Two types of particles going to the right and to the left are taken into account, where the size of right particles is larger than that of left particles. The counter flow of slender particles with different sizes is compared with that of slender particles with the same size. The jamming transition occurs at a critical density. Near the transition point, the volatile jam appears with a period, disappears in time, is formed again, and the process occurs repeatedly. The flow fluctuates highly by forming the volatile jam. The volatile jam moves slowly to the left direction, while the jam is stationary when the size of right particles equals that of left particles.