Abstract: We present an improved relaxation algorithm involving rotation of non-spherical particles.In a sphere assembly model,the algorithm simulates random packing of non-spherical particle of any shape as well as particle mixture consisted of particles with different shapes.In the sphere assembly model,particle shape is described with contour of a number of spheres.Contacts between non-spherical particles are treated as contacts of spheres.By introducing torque and rotation of non-spherical particles,the algorithm overcomes self-lock problem,and random close packing is achieved.Packing densities obtained are coincident with numerical and experimental results in literatures.

Key words: packing, non-spherical particle, relaxation algorithm, random close packing, sphere assembly