Mykola Mykolaiovych Biliaiev

Ukrainian State University of Science and technologies · Hydraulics

A 2D numerical model has been developed to estimate the airflow velocity field when flowing around the dam of an artificial storage facility for mineral processing waste. To solve the aerodynamic problem of determining the air flow velocity field when flowing around such hydraulic structures with a complex geometric shape, a potential motion model...

The paper presents data on the current state of waste storage facilities of mining and processing plants in Kryvyi Rih. They are complex, environmentally hazardous hydraulic structures. When assessing the extent of dust pollution from tailing ponds, it is extremely important to know the intensity of dust emissions from the surface of the alluvium b...

Постановка проблеми. Проектування систем очищення стічних вод – складний процес, що потребує використання спеціальних математичних моделей. Як правило, на етапі проектування споруд систем водовідведення використовуються емпіричні моделі, що дозволяють отримати лише «інтегральну» характеристику ефективності очищення стічних вод. Але в низці випадків...

Problem statement. The task of assessing the risk of damage to an oil storage facility by debris in the event of a drone explosion is considered. An analysis of the debris movement velocity and the effectiveness of the use of a protective barrier to stop the debris movement in the direction of the oil storage facility is carried out. The purpose of...

Purpose. Today, aeration tanks are widely used to treat industrial and municipal wastewater. Assessing the efficiency of water treatment in aeration tanks under different operating conditions is an important task. To solve this problem, it is necessary to have mathematical models that allow to quickly obtain data on the effect of treatment in aerat...

Problem statement. Industrial sites where coal storages are located are intensive sources of dust pollution of the environment. There is an important problem of assessing the intensity of dust removal into the atmospheric air from polluted areas. Knowledge of the intensity of dust removal into the atmospheric air makes it possible to scientifically...

Постановка проблеми. Ефективність біологічного очищення води суттєво залежить від концентрації розчинного кисню в об’ємі біореактора. Але під час роботи біореакторів кисневий режим змінюється, тому важливо прогнозувати концентрацію кисню для різних режимів експлуатації очисних споруд. Для розрахунку кисневого режиму використовуються спрощені матема...

Purpose. Settling tanks are widely used in technological schemes of wastewater treatment. As a rule, horizontal settling tanks are used in practice. However, to increase the efficiency of water treatment in a horizontal settling tank, additional elements can be used, which are placed in different places in the structure. When reconstructing such st...

Постановка проблеми. Розглядається задача оцінювання зон ураження людей у разі виникнення екстремальної ситуації на АЗС, розташованій в людному місці м. Дніпро. Здійснюється аналіз розмірів зон теплового забруднення повітря та зони можливого ураження людей у випадку розлітання уламків, через виникнення екстремальної ситуації на АЗС. Для розв’язання...

Problem statement. The task of evaluating the effectiveness of the use of protective screens of different geometric shapes to reduce the level of air pollution is considered. The data on the screen allow you to change the aerodynamics of the air flow and redirect the movement of polluted air away from the work areas in the other direction. The purp...

The methodology for modeling the propagation of accidental releases of radionuclides from a power unit of a nuclear power plant has been developed. The calculation method takes into account the most critical factors propagation cloud - wind direction and speed, the intensity of the release radionuclides change: semi-continuous release, long-term re...

The object of the study is the dynamics of air ion spread in rooms from the source of artificial air ionization under different starting conditions. There is currently the problem of distribution of air ions in the room with regulatory concentrations in all critical zones. An effective method of ensuring proper air ion concentrations is to model th...

The accidents at nuclear power plants pose a particular threat to the population and the environment. Accidental emissions at nuclear power plants can cause long-term radioactive pollution of the environment, and the elimination of such pollution can take years. For practice, it is very important to predict the intensity and size of radioactive con...

Tailings formed during the mining and beneficiation of iron ore are sources of intensive dust generation. In order to assess the intensity of dust formation and determine the effectiveness of methods of its reduction, it is necessary to know the local velocity of the air flow near the various surfaces of the tailings storage facility. For the theor...

Problem statement. The task of forecasting for chemical pollution areas at the industrial site during atmospheric inversion and chemically hazardous substance evaporation from the spill zone is considered. The purpose of the work is to develop a method for calculating the intensity and shape of pollution areas in the atmosphere that are formed unde...

The object of this study is the process of thermostating the main fairing with a satellite at the stage of prelaunch preparation of the launch vehicle. When thermostating, it is necessary to predict the risk of dust contamination of the satellite surface. Currently, there are no normative methods for solving this problem. A numerical model has been...

Problem statement. The task of forecasting zones of chemical pollution at an industrial site under unfavorable conditions − calm is under consideration. It is under such weather conditions that there is very intense air pollution in working areas at industrial sites. In order to quickly predict the level of chemical pollution, you need to have math...

Problem statement. Analysis of the treatment facilities efficiency in sewerage at the stage of their design is great importance. Also, at the stage of structures’ reconstruction or their operation adjustment under different load conditions, it is necessary to know the efficiency of water treatment in different areas of treatment facilities. Such in...

Problem statement. The problem of predicting chemical pollution zones near the highway, where protective barriers are located, is considered. The protective barriers influence the aerodynamics of air flow and reduce the level of working areas chemical pollution near the highway. It is necessary to have mathematical models that allow such evaluation...

In this study, a mathematical method is proposed for calculating the concentration field of air ions of different polarities and dust levels in the passenger compartment, taking into account the geometry of the passenger compartment and seats, shelves, and other internal elements of the passenger compartment. The method also takes into account chan...

Purpose. Development of CFD model and computer code for the analysis and forecasting of the process of formation of areas of chemical contamination in the workplace in the event of an emergency leak of a hazardous substance, allowing to take into account the influence of obstacles and the operation of the ventilation system on this process. The met...

The report considers some classes of numerical models that were built to predict the consequences of emergencies at industrial enterprises. The first class of models has been developed to predict chemical air pollution in case of accidental emissions of toxic substances. Modeling is carried out on the basis of the fundamental equations of aerodynam...

This work is devoted to the development of a method for numerical calculation the concentration field of a harmful substance CO along the road and in the territory adjacent to it. The method takes into account not only the physical and meteorological parameters, but also the location and height of the screens. The implementation of the method is ba...

Wetting the surface of coal piles is a common method of reducing dust emissions. The problem of modeling air pollution near coal after its wetting is considered. A two-dimensional mass transfer equation was used to model the process of coal dust distribution from the pile. This equation takes into account the convective and diffusion transport of c...

Highways are an intensive source of environmental pollution. Atmospheric air is exposed to the fastest anthropogenic influence. Therefore, a particularly important task is to minimize the level of air pollution near the highway. An effective method for solving this problem is the use of protective barriers of various shapes installed near highways....

Problem statement. The problem of evaluating the effectiveness of using the water curtain to reduce the risk of thermal injury to people in a fire is considered. The problem is to determine the temperature fields when supplying water for air cooling. The purpose of the article. Development of a numerical model for calculating the process of propaga...

The problem of air pollution modelling near road which is situated in complex terrain is under consideration. To simulate wind flow pattern in case of complex terrain Navier-Stokes’s equations were used. NavierStokes’s equations were written using Helmholtz variables. Numerical finite difference schemes of splitting were used for numerical integrat...

In this study, a numerical model is proposed for calculating pollution zones near the road, taking into account the geometry of the automobile transport, meteorological conditions, the location of the barriersand their height, and the chemical transformation of nitrogen oxides in the atmospheric air.The numerical solution is based on the integratio...

The problem of estimating the level of air pollution in the working areas near the coal pile is considered. The task is to develop a CFD model that allows to predict the level of air dust pollution, taking into account the process of wetting the surface of the coal pile. To model the process of coal dust transfer in the air, a twodimensional mass t...

Purpose. The main purpose of the article is to develop a 3D CFD model for modeling the process of biological wastewater treatment in an aeration tank. Methodology. For mathematical modeling of the process of biological wastewater treatment in the reactor, taking into account the flow hydrodynamics, geometric shape of the aeration tank, convective-d...

Purpose. This work provides for the development of a hydraulic model for calculating the unsteady ammonia outflow from a damaged pipeline and the implementation of this model into a numerical model for predicting emergency air pollution. Methodology. To solve the problem, the calculated dependencies of the pressure flow hydraulics were used. An emp...

Purpose. The main purpose of the article is to develop a numerical model for the analysis of the process of biological wastewater treatment in a reactor with a mobile biocenosis. Methodology. For mathematical modeling of the process of biological wastewater treatment in a reactor with a moving biocenosis, a hydrodynamic model of a non-viscous vorte...

Purpose. Efficiency determination of the aeration tank at the stage of design or reconstruction of bioreactors in which biological wastewater treatment is carried out requires the use of special mathematical models and calculation methods. The main purpose of the article is to develop CFD models for evaluating the operation efficiency of aeration t...

Intensive environment pollution takes place during coal transportation in open wagons. Emission of coal dust from the coal wagons cause contamination of atmosphere and territory adjacent to the railway track. Different ways to reduce coal dust emission from the wagon are used in the world. Unfortunately, in Ukraine, this problem is far from solutio...

In case of some accidents on railways there may be situations when the shock wave appears and interacts with different objects on the railway (wagons, cargo, buildings etc.). In these cases it is necessary to predict the possible effect of shock wave diffraction on the different objects. Study of these problems on the basis of physical experiments...

Diesel locomotives are widely used at Ukrainian railway stations as maneuvering locomotives. Emissions from these diesel locomotives contain different toxic chemicals. It is important to understand air contamination patterns which are formed at railway stations. Understanding of these contamination patterns allows to evaluate the negative impact of...

In this study, the methodological foundations of the technology for the local reduction of chemical pollution from vehicles were improvedthrough the use of two-level suction units and guide plates of various lengths installed on the nozzles of the suction devices. A program has been developed for the numerical calculation of the carbon monoxide con...

Purpose. The aim of the work is to develop multifactor chamber models for rapid evaluation of the efficiency of reactors for biological wastewater treatment. Methodology. Two numerical chamber models have been developed for computer simulation of the biological wastewater treatment process. The models are based on the law of mass conservation for s...

Purpose. This work includes the development of a computer model to calculate the risk of thermal damage to people in the shop in case of emergency burning of solid rocket propellant. Methodology. To calculate the temperature field in the shop in order to determine the zones of thermal damage to workers in the building, the equation expressing the l...

A computational model to simulate ventilation of a dead-end mine working with line brattice has been developed. To solve fluid dynamics problem, i.e. to compute flow pattern, model of inviscid flow has been used. That allows to compute quickly air flow pattern. To simulate dust dispersion in the dead-end mine working with brattice twodimensional eq...

Purpose. This work involves the development of a numerical model for the calculation of areas of thermal damage to people in the event of solid propellant burning at the industrial site. Methodology. An equation expressing the law of energy conservation was used to solve the problem of determining the areas of thermal shock of people at the industr...

The results of laboratory studies to evaluate the effectiveness of barriers which are used to reduce dust pollution from the coal pile are presented. The use of the Г-shaped barrier, which is set differently near the coal pile model, has been studied. A numerical model is proposed to compute coal dust concentration in the air near the pile. The Nav...

Purpose. Emissions from mine ventilation system can create intensive atmosphere air pollution. As a rule, a huge amount of dust from mine fan enters atmosphere low layers. An important task is the development of meth-ods to assess levels of the atmosphere pollution near mines and settlements. To solve this problem it is important to have physically...

Purpose. Rock dumps are long-term sources of air pollution. A significant amount of harmful substances enters the atmosphere. Particularly intense is the pollution of atmospheric air due to dusting dumps. An important task is the development of methods for predicting the dynamics of atmospheric air pollution during the emission of harmful impuritie...

Purpose. The work involves the development of numerical models to assess the effectiveness of the air curtain usage near the building in the event of chemical pollution. Methodology. To describe the process of dispersion of a chemically hazardous substance, emitted in emergency situations, the three-dimensional equation of impurity mass transfer in...

Purpose. The scientific work aims to develop a new method for assessing the level of chemical air pollution in working zones located in open areas near highways using screens of different heights. Methodology. The analytical method for calculating the airflow velocity field near protective screens is based on the mathematical apparatus of the theor...

Purpose. The scientific paper is aimed at creating a methodology of chemical pollution zones in the territories of industrial cities and accounting the possibility of assessing the risks of chronic diseases. Methodology. The method of numerical calculation of nitrogen dioxide concentration in atmospheric air is based on the solution of three-dimens...

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. Met...

Purpose. This work aims to develop a method of local outdoor reduction of the concentration of a chemically hazardous substance, which entered the atmosphere through a cafe roof vent. It also involves the creation of a numerical model for calculating the chemical contamination zone that allows assessing the effectiveness of the screens used to mini...

At present time, in Ukraine the intensive development of solid-propellant missiles takes place. These missiles are called «Grim», «Grim-2», etc. Transportation of rocket propellant very often is carried out by trains. In the case of accident during such transportation great amount of toxic chemicals may be emitted into atmosphere. It is very import...

Coal trains have an intensive impact on environment pollution. It is very important to predict adequately this impact during coal transportation. In Ukraine to predict atmosphere pollution from coal trains the regulatory model «OND-86» is used. This model does not take into account some important factors and coal train movement. We present numerica...

Purpose. The work involves the development of a numerical model for calculating the «vulnerability» zone of a possible terrorist attack objective with the use of a chemical agent in a built-up environment. The «vulnerability» zone is a territory near the attack objective, where the emission of a chemical agent during the attack will lead to undesir...

Purpose. The work involves the development of a 2D numerical model for calculating the «safety boundary» in the case of a terrorist attack using a chemical agent. The safety boundary is the boundary behind which the emission of a dangerous substance in a terrorist act will lead to undesirable consequences at the site of the attack object. Methodolo...

Purpose. A goal of the work is development of 3D numerical model for a territorial risk assessment in a case of a terrorist attack with usage of a chemical agent. Methodology. To describe the process of chemical agent dispersion in the atmosphere, emitted in a case of a terrorist attack, the equation of mass transfer of an admixture in atmospheric...

Purpose. The scientific paper involves the development of quick computing numerical model for prediction of output parameters of aeration tank. The numerical model may be used in predicting the effectiveness of aeration tank under different regimes of work. Methodology. To simulate the process of biological wastewater treatment in aeration tank num...

Purpose. The paper involves the development of a method to assess the territorial risk in the event of a terrorist attack using a chemical agent. Methodology. To describe the process of chemical agent scattering in the atmosphere, ejected in the event of a terrorist attack, the equation of mass transfer of an impurity in atmospheric air is used. Th...

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 buildi...

Purpose. The scientific paper solves the question of 2D numerical model development, which allows quick computation of air pollution in streets from vehicles. The aim of the work is numerical model development that would enable to predict the level of air pollution by using protective barriers along the road. Methodology. The developed model is bas...

Цель. Научная работа предполагает разработку 3D-численных моделей, которые позволят рассчитывать процесс загрязнения атмосферного воздуха выбросами автотранспорта с учетом химической трансформации вредных веществ. Также необходимо рассмотреть создание численных моделей, которые давали бы возможность прогнозировать уровень загрязнения атмосферного в...

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...

Purpose. The article is aimed: 1) to develop the coal coating solution in open railway cars or to cover coal piles to minimize the coal dust losses; 2) creating a mathematical model of the process of the solution feeding to the surface of coal. Methodology. To solve this problem, it was developed a special solution containing cheap industrial waste...

Purpose. The article is aimed to develop 3D numerical model for the prediction of atmospheric pollution during transportation of bulk cargo in the railway car. Methodology. To solve this problem, it was developed three-dimensional numerical model, based on the use of the transport equation of dust pollution in the air by the wind and atmospheric tu...

Purpose. Development of methods and software for determining levels and zones of atmospheric air pollution by emissions from mining and power generating companies that contain significant volumes of sulfur oxides. Methodology. The forecast of the level of atmospheric air pollution by sulfur-containing emissions from mining and power generating comp...

Цель . Научная работа предполагает: 1) разработку 3 D численных моделей, которые позволяют рассчитывать процесс загрязнения атмосферного воздуха выбросами автотранспорта; 2) создание моделей, которые давали бы возможность прогнозировать уровень загрязнения атмосферного воздуха в условиях городской застройки. Методика. Для решения задачи по оценке у...

Purpose. The article aims to develop 2D numerical models for the prediction of atmospheric pollution during transportation of coal in the railway car, as well as the ways to protect the environment and the areas near to the mainline from the dust emission due to the air injection installation. Methodology. To solve this problem there were developed...

Purpose. The scientific work is concentrated on development of 3D, 2D numerical models for the prediction of atmospheric pollution during transport of bulk cargo in the railway car. Methodology. To solve this problem numerical models were developed, based on the use of the motion equations of inviscid incompressible fluid and mass transfer, to dete...

Purpose. This research focuses on the development of an applied numerical model to calculate the dynamics of atmospheric pollution in the emission of dangerous chemical substances in the event of transportation by railway. Methodology. For the numerical simulation of transport process of the dangerous chemical substance in the atmosphere the equati...

Purpose. The article highlights the question about creation the complex numerical models in order to calculate the ions concentration fields in premises of various purpose and in work areas. Developed complex should take into account the main physical factors influencing the formation of the concentration field of ions, that is, aerodynamics of air...

Purpose. The paper supposes creation of a CFD model for calculating the air ion regime in the premises and in work areas at artificial ionization of the air by the ionizer installation indoors with considering the most important physical factors that influence the formation of ions concentration field. Methodology. The proposed CFD model for calcul...

Purpose. The present research is aimed to the development of a method to assess the potential territorial risk in accidents on the railways, which takes into account the specificity of the chemically hazardous substances emission in emergency situations during their transportation. Methodology. The basis of the proposed method is numerical modeling...

Purpose: The development of the methodology for atmospheric air pollution assessment in the zone affected by city highways, which is based on the equation of detached flow of inviscid fluid and considers the dwellings zone peculiarities as well as the natural laws of chemical transformations of air pollutants. Methodology: The predicted level of at...

Purpose.Horizontal settlers are one of the most important elements in the technological scheme of water purification. Their use is associated with the possibility to pass a sufficiently large volume of water. The important task at the stage of their designing is evaluating of their effectiveness. Calculation of the efficiency of the settler can be...

Purpose. Development of the operational numerical model to compute contamination of the atmosphere over Pavlograd city in the case of solid rocket propellant ignition at the storage. Methodology. To simulate the toxic chemical dispersion (product of the solid rocket propellant firing) the equation of convective-diffusion transfer is used. This equa...

This paper presents expert systems and the numerical models to simulate atmosphere pollution after accidents with toxic substances. The expert systems allow one to assess impact on the person or environment after accidents of different types at chemical enterprises or storages. The process of toxic gas dispersion in the atmosphere is computed using...

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 simul...

A mathematical model which can take into account all the scenarios of accidents has been developed. The code AIR-SIM was worked out on the basis of the described difference schemes. This code was used to simulate the atmospheric pollution for different accidents on the territory of the Pavlograd Chemical Plant. In particular, a numerical model was...

Huge quantities of mine waters are discharged to the rivers from Krivoy Rog iron ore mines in the south of Ukraine. At present, the project of these mine waters discharge into the Black Sea is worked out. The problem of this discharge environmental impact assessment is of great interest. One of the branches of this problem is the prediction of the...

In Ukraine, to predict the area of chemical pollution after accidents with toxic substances standard model which is adopted by Government is used. This is the empirical model which possibilities are very restricted. This paper presents numerical models to simulate the flow field and pollutant concentrations in the regions with complex topography. T...

The 2D numerical model to simulate the pollutant dispersion and evaporation, when the air jet is used, was proposed. The results of numerical experiment are presented.

The 2D numerical model to simulate the pollutant dispersion in rivers is offered. The model is based on the equation of potential flow and the transport model. The results of numerical experiment are presented.

A number of technical approaches to eliminate the contamination area in soil or ground waters were considered. Their advantages and disadvantages are also discussed.

The 3D CFD model to simulate the pollutant transfer and the process of neutralization of toxic gas after accidents was developed. The model is based on the transport gradient model and the model of inviscid incompressible fluid. The results of numerical experiments are presented.

The 2D numerical model to simulate the pollutant dispersion over complex terrain is proposed. Results of numerical experiment are presented.

The 2D numerical model to simulate the pollutant dispersion in public compartments is offered. The model is based on the equation of potential flow and the equation of admixture transfer. The results of numerical experiment are presented.

A numerical model to calculate the process of ground waters rise has been proposed. The model is based on the 2-D equations of filtration. The results of numerical experiment are presented.

A numerical model to simulate the process of heavy gas transfer was developed. The numerical simulation is carried out using 3D models of pollutant transfer and potential air flow. The implicit finite difference schemes are used. The results of numerical simulation of air pollution are presented.

A numerical model to calculate the process of ground waters protection from pollution with the use of neutralizer has been proposed. The model is based on the 2-D equations of filtration and admixture transfer. Results of numerical experiment are presented.

A new code to simulate the process of atmosphere pollution was produced. This code is based on the numerical integration of the 3D transport equation. The implicit difference scheme is used for the numerical integration. The code was used to simulate the process of air pollution in a passenger train when the train meets a toxic gas cloud. The code...

The method to calculate the thermo pollution and damage of people when the fire ball was burning was developed. The method is based on numerical integration of 3D equation of energy. The results of numerical experiments are presented.