The effect of the contaminant emission rate on the velocity field and contaminant distribution with the presence of an obstacle in a large spaceQianru Zhang, Chengqiang Zhi, Yixiang Huang, Wei Ye, Jun Gao and Xu ZhangE3S Web Conf., 111 (2019) 02061DOI: https://doi.org/10.1051/e3sconf/201911102061