Valeriia Melnikova

• Master of Engineering
• PhD Student at Bauman Moscow State Technical University

The results of methodical investigation, aimed on testing of the performances of free opensource CFD toolbox OpenFOAM in the field of simulation of hydraulic units’ dynamics using Finite Volume Method and dynamic meshes are presented. The following key features are reviewed: the choice of appropriate algorithms managing dynamic sliding meshes; desi...

Today small satellites become more and more highly-demanded due to their ability to solve a significant amount of technical and scientific problems with less time and material inputs. Taking into account that a group of small satellites is often even more useful than one big spacecraft, we started a project of nanosatellite constellation for Sun ob...

Numerical simulation plays an important role in the design of new hydraulic units. It allows to minimize the number of expensive experimental tests of products and reduces development time. The flow in pipes, valves, regulators and other hydraulic elements belongs to the internal incompressible flow. Standard numerical methods such as a finite vol...

This paper presents the Eulerian–Lagrangian approach for numerical modeling of high-speed gas-droplet flows and aeroacoustics. The proposed hybrid approach is implemented using the OpenFOAM library and two different methods. The first method is based on a hybrid convective terms approximation method employing a Kurganov–Tadmor and PIMPLE scheme. Th...

The article presents the results of thermal tests of the condenser of the steam turbine PT-25-90 UTZ during off-design operation. An increase in the pressure in the condenser for the possibility of heating the district heating water is considered. The pressure in the condenser was artificially deteriorated both by lowering the vapor pressure of the...

Greenhouse gases absorb the Earth’s thermal radiation and partially return it to the Earth’s surface. When accumulated in the atmosphere, greenhouse gases lead to an increase in the average global air temperature and, as a result, climate change. In this paper, an approach to measuring CO2 and CH4 concentrations using Fourier transform infrared spe...

The article presents a comparison of the real overall heat transfer coefficient, based on thermal tests of the condenser of the steam turbine PT-25-90 KTZ during off-design operation (with a degraded vacuum) and its expected value, calculated via the Metropolitan Vickers formula. The average cooling water inlet temperature was 61.2 °C, average exha...

This work is devoted to the capabilities analysis of constellation and small spacecraft developed using CubeSat technology to solve promising problems of the Earth remote sensing in the area of greenhouse gases emissions. This paper presents the scientific needs for such tasks, followed by descriptions and discussions of the micro-technology applic...

Dissolved oxygen concentration in the steam turbine condenser significantly influences the failure-free operation of the power unit. Despite the wide range of recommendations and operating experience, there are still condenser working regimes with abnormal dissolved oxygen concentration. Taking into account the importance of water chemistry, there...

This paper presents the results of the flow rate characteristics study of the new design liquid flow valve. Data were obtained using finite volume numerical simulation in the OpenFOAM package of the spatial flow of liquid in the flow part of the valve. A simplified quasi-static approach was used, which allowed obtaining results at low-cost computin...

The study of icing processes on elements of an airplane, helicopter, UAV, wind turbines, and power line wires is an urgent task in connection with flight safety and reliable operation of ground equipment. The features of the numerical simulation of multicomponent reactive mixture flow using the iceFoam solver were considered. The Euler-Lagrangian a...

The paper presents the Yareelo project of deploying a constellation of two nanosatellites in low earth orbit. The project has been developed by students, postgraduates and young specialists of Bauman Moscow State Technical University. One of the nanosatellites is designed to observe the Sun using an X-ray spectrophotometer developed by the Lebedev...

This work is devoted to the creation of the flagmanFoam software package developed on the basis of the OpenFOAM v2012 package. A solver has been developed to simulate icing in conditions of small droplet in-flow, with a characteristic droplet size of up to 40 microns, which corresponds to Appendix C of the Aviation Regulations AP-25. Computational...

Currently RF is actively developing the Northern territories. Questions of studying the physical processes of icing are relevant, since climate conditions affect the surface of the objects under study (power lines, residential buildings, power plants, aircraft), human safety and ecology. In clouds, the appearance and movement of liquid droplets-par...

This paper contains analysis and selection procedures for target descent parameters of the probe for long-term contact interaction exploration of cold giant-planet atmospheres. Neptune is chosen as an example. Supposedly, such probe can be built with the use of a hot air balloon with the nuclear heat source. According to evaluation, a large descent...

Today, the improvement of steam distribution and regulation of steam turbines is an urgent task. The efficiency and reliability of the steam turbine depend on the gas-dynamic perfection of the shut-off and control valves. Using a tool such as CFO (computational fluid dynamics) programs allows you to visualize the process of steam flow in the valve,...

A project of constellation consisting of two CubeSat spacecraft for continuous monitoring of solar activity. As a means to deploy the constellation of nanosatellites in the final orbit, a two-bladed rotor sail opening by centrifugal forces is considered. The paper defines the concept of building the nanosatellite constellation, providing technical...

In this paper, we present the project of the solar sail unit for deployment of CubeSat constellation. It is also possible to use this unit for de-orbiting of satellites in fully passive mode. We prove the feasibility of the concept by ballistic calculations taking into account dependence of time of constellation formation from the number of satelli...

Due to the development of Wind Energy and construction of new wind farms in Russian Federation there is a need for the solution of application-oriented problems and development of effective methods for calculation of wind turbine’s elements. One of the directions for computational continuous mechanics is connected with problems in aeroelasticity (f...