Mathematical Simulation and program of gas-liquid two-phase well flow pattern Quanhua Huang, Xingyu Lin, Yunjun He, Chengyin Wang, Yi Hu, Hongjun Ding, Jian Jiang and Jian Li E3S Web Conf., 185 (2020) 01087 Published online: 01 September 2020 DOI: 10.1051/e3sconf/202018501087