Effect of repulsive interaction and initial velocity on collective motion process I. Tarras, A. Eddakoun, A. Hader, S. Moushi, I. Bakassi, R. Et Touizi, I. Achik, M. Eddahby, A. El Bachiri and Y. Boughaleb Eur. Phys. J. E, 47 10 (2024) 62 Published online: 14 October 2024 DOI: 10.1140/epje/s10189-024-00455-2