Reaserch On Diffussion Simulation System Of Toxic Gas Transportation By Tank Cars Based On FLUENT Secondary Development

With the rapid development of the national economy, as the raw material and theproducing auxiliary material, toxic gas is widely used in the numerous professions, and theincreasing social demands for it are causing increasing pressure on transportation. As themain tool to transport the toxic gas, tank car has become the largest number of dangeroustransport vehicles, and nearly80percents of the accidents about road transportation ofhazardous goods involve it. Except the features of flammability and combustibility, the mostcontribution to hazards of the public and the ecological environment comes from its toxicity.Once the toxic gas leaks out during the transit, it will cause serious consequences to thesecurity of resident’s lives and properties. What’s worse, it will seriously destruct thesurroundings. As people do not understand the law of toxic gas diffusion, especially it isdifficult to get accurate diffusion range just by using the traditional toxic gas diffusion model,which is based on empirical formula and has large deviation.In recent years, due to the advantages of high accuracy and the good simulation results,the computational fluid dynamics (CFD) software has been widely used in the gas diffusionresearch, especially the commercial CFD software FLUENT is widely used in the study oftoxic gas leakage and dispersion by virtue of its powerful features.Based on the theories on computational fluid dynamics (CFD), which refer to the leakageof toxic gas, the leakage was simulated by using FLUENT software, what’s more, based onthe VC++development platform, through realizing the secondary development of FLUENTby using object-oriented programme design and high-efficiency parameter modelingtechnique, the tank car road transport toxic gas leakage and diffusion simulation system wasbuilt.The simulation system was used to study the spread of toxic gas. In three instances, thepoisoning regions of the same kind of toxic gas under different wind speeds or different leakage time, and the poisoning region of different kinds of toxic gas leakage were studied.The simulation results are same with the theoretical, and provide a lot of help for a betterunderstanding of the toxic gas leaking process under different conditions. The study revealsthat the system simplifies the modeling process of the toxic gas diffusion and greatlyimproves the efficiency of toxic leakage study, the researchers can liberate themselves fromthe tedious modeling process, and pay more attention to the confirmation of the computingscheme and the analysis of the results.