The particle-wall friction coefficient was set at mw ¼ 0.3, the particle stiffness was set to kn ¼ 1,104 Nm1 and the particle-particle friction coefficient was set at mp¼ 0.3
The particle-wall frictioncoefficient was set at mw ¼ 0.3, the particle stiffness was set tokn ¼ 1,104 Nm1 and the particle-particle friction coefficientwas set at mp¼ 0.3