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# Кафедра "Гідравліка та водопостачання"

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RU: Кафедра "Гидравлика и водоснабжение"

EN: Department "Hydraulics and Water Supply"

EN: Department "Hydraulics and Water Supply"

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### Browsing Кафедра "Гідравліка та водопостачання" by Author "Amelina, L. V."

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Item Numerical Simulation of Air Pollution in Case of Unplanned Ammonia Release(Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Dnipro, 2017) Amelina, L. V.; Biliaiev, Mykola M.Show more EN: Purpose. Development fast calculating model which takes into account the meteorological parameters and buildings which are situated near the source of toxic chemical emission. Methodology. The developed model is based on the equation for potential flow and equation of pollutant dispersion. Equation of potential flow is used to compute wind pattern among buildings. To solve equation for potential flow Samarskii implicit difference scheme is used. The implicit change – triangle difference scheme is used to solve equation of mass transfer. Numerical integration is carried out using the rectangular difference grid. Method of porosity technique («markers method») is used to create the form of comprehensive computational region. Emission of ammonia is modeled using Delta function for point source. Findings. Developed 2D numerical model belongs to the class of «diagnostic models». This model takes into account the main physical factors affecting the process of dispersion of pollutants in the atmosphere. The model takes into account the influence of buildings on pollutant dispersion. On the basis of the developed numerical models a computational experiment was carried out to estimate the level of toxic chemical pollution in the case of unplanned ammonia release at ammonia pump station. Originality. Developed numerical model allows to calculate the 2D wind pattern among buildings and pollutant dispersion in the case unplanned ammonia release. Model allows to perform fast calculations of the atmosphere pollution. Practical value. The model can be used when developing the PLAS (Emergency Response Plan).Show more Item Numerical Simulation of Air Pollution in Workplaces After Toxic Chemical Emission(Приднепровская государственная академия строительства и архитектуры, Днепр, 2017) Biliaiev, Mykola M.; Amelina, L. V.; Stepanova, Yu. O.Show more EN: Purpose. Development of a numerical model to compute the dynamics of atmosphere pollution in workplaces after accidents which results in toxic chemical emission. Methodology. For the numerical simulation of atmosphere pollution in workplaces 3D equation of pollutant dispersion is used. This equation takes into account the convective and dispersion processes of pollutant transport, the rate of toxic chemical emission, position of source emission. For the numerical integration of the governing equation of pollutant dispersion in atmosphere the implicit finite-difference scheme is used. On the basis of the numerical model generic model was developed FORTRAN language was used to develop the generic model. Computational experiments were carried out to calculate the dynamics of pollution after accident emission at ammonia pipeline which is situated at Dnepr River. Findings. The proposed model allow s to simulate the atmosphere pollution in workplaces alter accident emission of toxic chemicals. The model allows quickly obtain the information which can be used for response methods development. Results of numerical experiments are presented. Originality. 3D numerical model was developed allowing to calculate quickly atmosphere pollution after accidents which result in toxic chemical emission. Practical value. The developed model can be used for numerical simulation of air pollution in workplaces after toxic chemicals emissions. It can be used at the stage of PLAS (ПJIAC) development.Show more Item Numerical Simulation of the Atmosphere Pollution After Accident at the "Tolliaty - Odessa" Ammonia Pipe(Springer, 2013) Biliaiev, Mykola M.; Amelina, L. V.; Kharytonov, Mykola M.Show more EN: The results of numerical simulation of environment pollution after accident at the ammonia pipe are presented in this paper. The problem was solved for two different scenarios. Firstly only the ammonia ejection into the atmosphere was considered. 3D equation of pollutant dispersion (k - gradient model) and model of potential flow were used to simulate the process of air pollution. At the second step the problems of river Dnepr pollution and evaporation of ammonia from the water surface were considered. The developed numerical models and the code were used to calculate the scale of the air and water pollution. The code was used to calculate the toxic gas penetration into the dwellings of the settlements which are situated near the ammonia pipe. It allowed obtaining the information about the possibility of safety people evacuation. © Springer Science+Business Media Dordrecht 2014.Show more Item Reducing Ammonia Concentrations in Atmosphere After its Unplanned Release(Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Dnipro, 2017) Amelina, L. V.; Biliaiev, Mykola M.; Mashykhina, Polina B.Show more EN: Purpose. The aim of this work is development of numerical model, which allows to calculate the efficiency of neutralizer supply for reduction of air pollution in case of unplanned ammonia emission at the territory of ammonia pump station. The numerical model should allow fast calculating, taking into account the meteorological parameters and buildings situated near the source of toxic chemical emission and equipment for neutralizer supply. Methodology. The developed model is based on the equation for potential flow and equation of pollutant dispersion. To simulate the chemical interaction between ammonia and neutralizer the stoichiometry equation is used. Equation of potential flow is used to compute flow pattern among buildings. To solve the equation for potential flow the Samarskii implicit difference scheme is used. The implicit change-triangle difference scheme is used to solve equation of mass transfer. While for the numerical integration the authors use the rectangular difference grid. Method of porosity technique («markers method») is applied to create the form of comprehensive computational region. Emission of ammonia is modeled using Delta function for point source. Findings. Developed numerical model belongs to the class of «diagnostic models». This model takes into account the main physical factors affecting the process of dispersion of ammonia and neutralizer in the atmosphere, as well as the influence of buildings on admixture dispersion. On the basis of the developed numerical models the authors carried out a computational experiment to estimate the efficiency of neutralizer supply for reduction of air pollution in case of unplanned ammonia release at ammonia pump station. Originality. Developed numerical model allows calculating the flow pattern among buildings and estimating the efficiency of neutralizer supply for reduction of air pollution in the case unplanned ammonia release. Practical value. Model allows performing fast calculations of the atmosphere pollution in the case of unplanned ammonia release.Show more Item Risk Assessment With the Use of the Monte-Carlo Method(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Amelina, L. V.; Biliaiev, Mykola M.; Berlov, Oleksandr V.; Cherednychenko, L. A.Show more EN: Purpose. This work involves the development of a numerical model for the calculation of chemical contamination zones in the event of ammonia accident at the pumping station, as well as a model for assessing the risk of damage and wound depth in the body in case of fragments scattering formed during the pipeline explosion at the pumping station. Methodology. To solve this problem, we used the mass transfer equation for the ammonia propagation in the air. A potential flow model is used to calculate the air flow velocity field in the presence of buildings at the ammonia pumping station. The numerical solution of the three-dimensional equation for the velocity potential is derived by the cumulative approximation method. When using this numerical model, the irregular field of wind flow velocity, the change in vertical atmospheric diffusion coefficient with altitude, the ammonia emission intensity, the emission point of the chemical substance were taken into account. A differential splitting scheme was used to numerically solve the ammonia transfer equation in the air. Physical splitting of the three-dimensional mass transfer equation to a system of equations describing the contaminant transfer in one coordinate direction is carried out beforehand. At each step of splitting, the unknown value of ammonia concentration is determined by an explicit scheme of point-to-point computation. A mathematical model for calculating the fragments scattering in case of emergency at the pumping station is considered. Findings. On the basis of the developed numerical model, a computational experiment was conducted to estimate the level of air pollution at the ammonia pumping station. The area of possible damage of people during the fragment scattering during the explosion at the ammonia pumping station was determined. Originality. A numerical model has been developed that allows calculating the chemical contamination zones in case of emergency ammonia emission at the pumping station. The model is complemented by assessment of impact zones in case of fragment scattering during the pumping station explosion. Practical value. Based on the developed mathematical model, a computer program was created, which allows performing serial calculations for determining the impact zones during emergency situations at the chemically hazardous objects. The mathematical model developed can be used to perform serial calculations during the development of emergency response plan for chemically hazardous objects.Show more