The effective management of longwall goaf gas emission，spontaneous heating and goal inertisation is paramount to the sustained productivity and safety of underground coal mines. Understanding of the airflow and gas characteristics helps the development of innovative strategies for gas capture and the suppression of self-heating hazards behind the face.CSIRO has been engaged in the investigation of gas flow migration dynamics within longwall goaf areas with the objective of improving gas capture，minimising the risk of spontaneous combustion and developing effective goaf inertisation strategies.Three dimensional Computational Fluid Dynamics(CFD)models have been developed to study the goaf gas dynamics under the influence of various mining and geological parameters including ventilation layouts，face orientation and gas emission rates.The simulation results provide new insights into the fundamental process of gas flow motion taking place within the goaf as well as the subsequent impact of goaf gas drainage and inert gas injection for goal inertisation.In combination with field work，this approach not only helps the design of innovative gas management strategies but also the implementation of optimum goaf inertisation strategies for both seal-off and active longwall panels.