Flow structure transition and identification of two-phase fluid flow through rough rock fractures Yakun Wang, Zhenyu Zhang, P. G. Ranjith and Xuefeng Han Eur. Phys. J. Plus, 138 5 (2023) 376 Published online: 03 May 2023 DOI: 10.1140/epjp/s13360-023-03977-4