2019, Koldoba, A. V., Ustyugova, G. V., Bogovalov, S. V., Боговалов, Сергей Владимирович

© 2019, Pleiades Publishing, Ltd. Abstract: We consider numerical aspects of the mathematical modeling of composite flows (relativistic and nonrelativistic) on adaptive computational grids applied to a double pulsar–optical star system. The pulsar is the source of an ultrarelativistic wind of the electron-positron plasma and the optical star is the source of a nonrelativistic wind. In the domains of relativistic and nonrelativistic flows, the plasma dynamics are described by different systems of equations. Moreover, the wind parameters are such that it is significantly difficult to model them in a similar way. Despite the fact that the distance between the partners of the binary system varies depending on the orbital phase, the flow is self-similar and is determined by the dimensionless parameters of the problem. The flow pattern can vary significantly under variations of these parameters. This requires the flexibility of the algorithm to construct a computational grid adaptable to the solution. In this work, we present the possibilities of use adaptive grids for modeling the above-mentioned class of composite flows.

2014, Borisevich, V. D., Borman, V. D., Bogovalov, S. V., Kislov, V. A., Tronin, V. N., Tronin, I. V., Abramov, V. I., Yupatov, S. V., Кислов, Владимир Александрович, Боговалов, Сергей Владимирович, Борисевич, Валентин Дмитриевич, Тронин, Иван Владимирович

We discuss the possibility of applying the semi-empirical formula derived for evaluating the separative power of the Russian-type optimized gas centrifuge, with a rotor length about 1 m, to centrifugal machines of arbitrary length. It is demonstrated that the formula can adequately describe the dependence of a single gas centrifuge's performance on rotor peripheral rotation, length, and diameter for machines with lengths of up to 5 m. The comparison of the calculated values for separative power, obtained by numerical simulations of flow and diffusion in gas centrifuges with that of the URENCO machines, demonstrates satisfactory agreement. © 2014 Copyright Taylor and Francis Group, LLC. Acknowledgement: This work is supported by the Ministry of Education and Science of Russian Federation in the framework of the Federal Targeted Program Scientific and Pedagogical Staff for Innovative Russia for 2009-2013, State Contract No. 16.740.11.0536 (the project leader is Professor V. D. Borisevich).

1985, Котов, Ю. Д., Кельнер, С. Р., Боговалов, С. В., Боговалов, Сергей Владимирович

2024, Bogovalov, S.V., Dzhulya, D.N., Tronin, I.V., Боговалов, Сергей Владимирович, Джуля, Денис Николаевич, Тронин, Иван Владимирович

2024, Dzhulya, D. N., Bogovalov, S. V., Tronin, I. V., Джуля, Денис Николаевич, Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

2021, Bogovalov, S., Petrov, M., Боговалов, Сергей Владимирович, Петров, Максим Александрович

© 2021 by the authors. Licensee MDPI, Basel, Switzerland.The objective of this work is to reproduce the formation of the fast polar wind and viscous disk outflow from Be stars in a unified physical picture. Numerical modeling of the plasma outflow from fast rotating stars was performed taking into account the acceleration of the plasma due to scattering of the radiation of the star in lines of plasma ions and excitation of the hydrodynamic turbulence in the outflow. The fast polar wind naturally arises in this picture with an expected flow rate. For the first time, it is shown that a disk-like outflow with a relatively high level of turbulence is formed at the equator of fast rotating stars emitting radiation-driven wind. However, the level of turbulent viscosity is well below the level necessary for the formation of a Keplerian disk.

2025, Dzhulya, D. N., Bogovalov, S. V., Tronin, I. V., Джуля, Денис Николаевич, Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

2022, Bogovalov, S. V., Borman, V. D., Vasilyev, A. V., Tronin, I. V., Tronin, V. N., Боговалов, Сергей Владимирович, Васильев, Александр Владиславович, Тронин, Иван Владимирович

© 2022 Institute of Physics Publishing. All rights reserved.The problem of the gas withdrawal from an Iguassu gas centrifuge (GC) at the speed of rotation, over 1000 m/s is considered. We focus our attention on the problem of achieving of optimal waste flow and friction power of the gas scoop simultaneously. Calculations were carried out in a three-dimensional approximation for supersonic flow of UF6 around a stationary gas scoop taken as a Pitot tube with a diameter of 2 mm. Attempts to achieve the optimal working regime of GC for the selected particular gas scoop were not successful. On the basis of this results we conclude that the optimal gas withdrawal and creation of the optimal axial circulation can be problematic for the hyper-speed gas centrifuges.

2020, Bogovalov, S. V., Borman, V. D., Tronin, I. V., Tronin, V. N., Боговалов, Сергей Владимирович, Тронин, Иван Владимирович

The dependence of the separative power of Iguassu gas centrifuges (GCs) on the rotor diameter and velocity of rotation V above 1000 m/s is investigated. The separative power is calculated exploring numerical modeling of the gas dynamics and diffusion of the binary mixture in a strong centrifugal field. The separative power is optimized on five internal parameters of the GC: pressure at the wall of the rotor, feed flux, temperature drop along the rotor wall, friction power of the waste scoop and radius of the baffle of the product chamber. Enrichment of the product flux does not depend on the velocity and diameter in the optimal regime of exploration. Growth of the separative power withis determined by growth of the feed flux with the velocity.

2022, Bogovalov, S. V., Боговалов, Сергей Владимирович