Numerical Simulation of Gas Leakage and Diffusion Based on FLUENT

Abstract

A two-dimensional unsteady flow model was established by Realizable k-ε turbulence model and SIMPLE algorithm, which was applied to conduct numerical simulation of sudden leakage and diffusion of coal gas in the plant area. Then, time-dependent distribution laws of coal gas under different influencing factors were analyzed. The results showed that as the leaking mouth diameter, internal pressure and wind speed increase, the concentration was roughly the same near the mouth; coal gas that was 3m away from the mouth diffuses more quickly and the area covered within explosion limit of coal gas expanded to some extent. For different gas medium, converter gas spread more widely than coke oven gas. The former accumulated on the ground, the latter accumulated above the ground.

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

“…Fu et al. 36 studied the relationship between the distribution law of gas concentration and leakage diameter, internal pressure, and wind speed. Wang et al 37 used CFD to simulate the hazards of a natural gas leak and explosion of the East Harlem gas explosion in Manhattan, New York, and the simulation results are consistent with the actual accident results.…”

“…Wang et al simulated the leakage and diffusion law of natural gas in the tunnel based on FLUENT and proposed the emergency accident ventilation for different pipeline pressures and leak sizes. Fu et al . studied the relationship between the distribution law of gas concentration and leakage diameter, internal pressure, and wind speed.…”

“…Wang et al 35 simulated the leakage and diffusion law of natural gas in the tunnel based on FLUENT and proposed the emergency accident ventilation for different pipeline pressures and leak sizes. Fu et al 36 studied the relationship between the distribution law of gas concentration and leakage diameter, internal pressure, and wind speed. Wang et al 37 used CFD to simulate the hazards of a natural gas leak and explosion of the East Harlem gas explosion in Manhattan, New York, and the simulation results are consistent with the actual accident results.…”