The anisotropy of free path in a vibro-fluidized granular gas
Mei Yifeng1, Chen Yanpei1, †, , Wang Wei1, Hou Meiying2
       

The probability of collision angle P(θ), where θ is the angle between the relative velocity and line of centers of a couple of particles upon collision, and e = 0.99,0.9, Lx = Ly = 300, N = 1000, Vdriven = 5.