A generalized particle-to-wall collision model for non-spherical rigid particles

• A theoretical particle–wall collision model for non-spherical hard particles is proposed.
• It is a generalized model for various shapes and consistent with the existing models for spheres.
• Two cases of particle–wall collision are measured experimentally to validate the model.
• Applications of multiple particle–wall impacts and with rough walls are also demonstrated.
• It shows the correctness of current model to be applied for complex particle flows.

An extended theoretical particle-to-wall collision model for the rigid particles of general shape is presented. It is based on an improved definition of the restitution coefficient, which is consistent with the previous definition of the restitution coefficient for spherical particles, but modified to meet the conditions of arbitrary non-spherical shapes. Moreover, it follows the fundamental conservation laws of momenta, as well as the Coulomb’s law of friction. In addition, this model is validated by comparing the simulation results to experimental measurements of the collision between rectangular particles and walls, which shows the correctness of the model. Finally, the applications of present model for multiple-impacts and the walls with roughness are demonstrated, which shows its potential feasibility for complex granular system simulations.

A theoretical particle-to-wall collision model for the rigid particles of general shape is presented. It follows the fundamental conservation laws of momenta and the Coulomb’s law of friction. This model is validated by experimental measurements of the collisions between rectangular particles and walls (Fig. a and b).Figure optionsDownload as PowerPoint slide