Simulation of granular in two dimensions: The effect of particle velocity on rigid wall boundaryDewi Muliyati, Bagaskara Firdaus, Diah Ambarwulan, Ella Fitriani, Siswoyo Siswoyo, Fauzi Bakri and Handjoko PermanaMATEC Web Conf., 197 (2018) 02001DOI: https://doi.org/10.1051/matecconf/201819702001