ЧИСЕЛЬНЕ МОДЕЛЮВАННЯ В ЗАДАЧАХ ОЦІНКИ РИЗИКУ ПРИ ЕМІСІЇ НЕБЕЗПЕЧНИХ РЕЧОВИН В АТМОСФЕРУ

Abstract

Development of a mathematical model for assessing the territorial risk in open areas and inside buildings in the event of the release of a chemically hazardous substance. To calculate the transfer of a chemically hazardous substance, in the event of its release under development conditions, the two-dimensional mass transfer equation for a chemically hazardous substance in the atmosphere is used. This equation takes into account the parameters of the meteorological situation, the intensity of emission of a chemically hazardous substance, the presence of buildings near the place of emission, the mode of emission of a dangerous substance. For the numerical integration of the modeling equation, an implicit alternating triangular difference scheme is used. To calculate the velocity field of the wind flow in the presence of buildings, a potential flow model is used. The Richardson method is used to solve the Laplace equation for the velocity potential. The constructed mathematical model makes it possible to carry out an assessment of the territorial risk, in the event of a release of a hazardous substance, under various weather conditions and in the presence of buildings. On the basis of the constructed mathematical model, a set of application programs has been developed, which can be used to assess the territorial risk in the event of the release of hazardous substances both in the residential area and at industrial sites. The mathematical model can be implemented on computers of low and medium power, which allows it to be widely used to solve problems of the class in question. The results of the conducted computational experiment are presented, allowing to evaluate the possibilities of the developed mathematical model for assessing the territorial risk in the event of a release of a chemically hazardous substance in a building environment. A mathematical model has been developed for assessing the territorial risk in the event of a release of a hazardous substance in a territory with buildings. The model can be used to assess the territorial risk both in open areas and inside buildings. The model allows you to get information about possible areas of destruction. The model is based on the numerical integration of the mass transfer equation and the Laplace equation for the velocity potential. The proposed model for the assessment of the territorial risk in the case of release of hazardous substance in the conditions of development can be used in developing a plan for the elimination of the emergency situation.