Numerical Simulation of Combustible Gas Diffusion with Obstacle in Space

The Reynolds averaged Navier-Stokes equation and the turbulence model equation which modified by buoyancy and the species transport equation are used to numerically calculate leakage and diffusion of combustible gas under the influence of obstacle in limited space in order to obtain the influence of obstacle on leakage and diffusion and furthermore get the concentration distribution of different positions of leakage holes. The results show that the obstacle can block diffusion of combustible gas and different positions have different concentration flied. When the leakage hole is at opposite side with outlet, the higher the position of leakage hole, the bigger the burst area. The bigger the height of obstacle, the bigger the burst area of finite space. The simulation results are contribute to safety design of indoor gas pipelines and can supply reference for preventing explosion accidents of indoor combustible gas. (C) 2017 The Authors. Published by Elsevier Ltd.