The Numerical Simulation Analysis Of Diffusion Of Gas Leakage And Gas Diffusion Simulation Software Development

With the arrival of the second decade of the21st century, urban development fasterand faster, as the supporting infrastructure of gas transmission and distribution industryhas been an unprecedented large-scale development. But because of the impact of gaspipeline manner, the material problems of gas pipelines, gas range expansion and otherfactors, the gas leak incident is prone. So in terms of the protection of persons orproperty to protect the economic point of view, the diffusion law of the gas leak is quitenecessary to reduce all aspects of the accident which caused the loss has importantsignificance.This paper reviews the existing gas diffusion theory, comparative analysis of theeffects of wind direction and speed, air temperature, atmospheric factors, gas physicalproperties and surface conditions, etc. of the gas leak diffusion process. Meanwhile, inorder to simplify the operation of Fluent simulation software, this paper used the Fluentprogram log files on. NET platform for Fluent written an auxiliary program, through therealization of the Fluent simulation software to control the process, success in thesoftware interface to integrate various important parameters such as the diffusion model,physical properties and other settings, and then set up a simple and intuitive call Fluentnumerical calculation in the background, and can be calculated in the convergence ofthe cloud and generate the required vector were observed and analyzed. This can be agood cost-saving setup time and learning the use of personnel, and to simulate thediffusion of a gas leak has some versatility.Finally, the various states through which the self-diffusion process within theresidential area of the gas pipeline leak caused by a gas leak diffusion numericalsimulation, the gas in different physical properties under different wind conditionsoutdoors, outdoor wind direction at different times and in different segmentconcentration, velocity, pressure distribution, and a detailed analysis of the leakage ofgas diffusion law under the influence of a variety of different conditions before, that thewind speed, air temperature, atmospheric factors, the physical properties of the gas andthe ground conditions and so on. The following conclusions:(1) the role of outdoorlight gases not only by the wind, but also by the role of outdoor air buoyancy, there isno obvious tendency to spread upwards, while heavy gas less affected by air buoyancy,and will wind down proliferation;(2) outdoor air is conducive to leaking gas leakageand diffusion of external wind speed, the smaller the concentration distribution zone near the source of the leak and its formation;(3) Obstacle is an important obstaclefactor in reducing the diffusion rate of gas;(4) Changes in wind direction will changethe flow pattern of the gas leakage in the original;(5) Gas concentration and time of theanalog leakage area is almost a linear relationship, to a certain period of time, thelonger the leak, the greater the concentration of the gas;(6) Gas leak in the simulationprocess areas, the first is a non-steady-state leakage process, and then with a slow leakof time slow longer becoming a stable and unchanging state.