Numerical Simulation of Methane Leakage Diffusion in the Space with Multi-buildings

Using k-ε turbulent equation and SIMPLE arithmetic, a multi-buildings space model was set up under realistic circumstances. The methane (CH₄) leakage diffusions from 3 gas-transporting pipelines with different pressures under 3 different wind flow conditions in the space with multi-buildings were simulated and the simulation results were contrasted and analyzed. Simulation results indicate that the leakage diffusion of CH₄ could be influenced by surrounding buildings, besides the effect of the wind flow. In addition, CH₄ gassy columniation will be bended to be adsorbed by surrounding buildings forming a high concentration zone when the pipe pressure is rather low or the wind velocity is rather fast. It will greatly increase the fatalness to the ambience and surrounding buildings.