Zobrazeno 1 - 10
of 66
pro vyhledávání: '"A. V. Koldoba"'
Autor:
Ahmed K. Abu-Nab, Alexander V. Koldoba, Elena V. Koldoba, Yury A. Poveshchenko, Viktoriia O. Podryga, Parvin I. Rahimly, Ahmed E. Bakeer
Publikováno v:
Mathematics, Vol 11, Iss 2, p 341 (2023)
The purpose of this paper is to present a one-dimensional model that simulates the thermo-physical processes for methane hydrate decomposition in porous media. The mathematical model consists of equations for the conservation of energy, gas, and liqu
Externí odkaz:
https://doaj.org/article/253781ca03a24b7fad4502b9a13b3339
Autor:
A. V. Koldoba, Galina V. Ustyugova
Publikováno v:
Mathematical Models and Computer Simulations. 13:674-683
The paper proposes a computational algorithm for the numerical simulation of two-dimensional magnetohydrodynamic (MHD) flows, using a symmetry analyzer as an element of the numerical method. The algorithm is based on a finite-volume Godunov-type sche
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aef242ccadc111364cdc5f25e3a2fbab
https://doi.org/10.1134/s2070048221040219
https://doi.org/10.1134/s2070048221040219
Autor:
G. V. Ustyugova, A. V. Koldoba
Publikováno v:
Mathematical Models and Computer Simulations. 12:125-132
The paper proposes a symmetry analyzer as an element of the computational algorithm for the numerical integration of two-dimensional equations of ideal gas dynamics. A symmetry analyzer is an algorithm that allows using grid data to give a preference
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64b8472ebe2d65e0947b0a0d9d15ad8a
https://doi.org/10.1134/s2070048220020076
https://doi.org/10.1134/s2070048220020076
Autor:
A. V. Koldoba, Galina V. Ustyugova, A. A. Blinova, P. S. Lii, Lisa Kaltenegger, Richard V. E. Lovelace, Marina M. Romanova
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 485:2666-2680
Inward migration of low-mass planets and embryos of giant planets can be stopped at the disc-cavity boundaries due to co-orbital corotation torque. We performed the first global three-dimensional (3D) simulations of planet migration at the disc-cavit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7498ee284dd59b03f4227a5c287114eb
https://doi.org/10.1093/mnras/stz535
https://doi.org/10.1093/mnras/stz535
Publikováno v:
Mathematical Models and Computer Simulations. 11:86-96
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 o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7a6f2d6d11ae90b5a6e094a96dc2d0d
https://doi.org/10.1134/s2070048219010095
https://doi.org/10.1134/s2070048219010095
Autor:
Galina V. Ustyugova, A. V. Koldoba
Publikováno v:
Smart Modelling for Engineering Systems ISBN: 9789813346185
The chapter describes an approach using Godunov-type difference schemes to construct numerical algorithms for numerically integrating equations of ideal gas dynamics and magnetohydrodynamics. This approach allows calculating the flows of conservative
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::463033ce761e6d1fcc5692aeb552503e
https://doi.org/10.1007/978-981-33-4619-2_10
https://doi.org/10.1007/978-981-33-4619-2_10
Autor:
Galina V. Ustyugova, Dong Lai, Richard V. E. Lovelace, Marina M. Romanova, A. A. Blinova, A. V. Koldoba
We present results of global three-dimensional (3D) magnetohydrodynamic (MHD) simulations of accretion onto magnetized stars where both the magnetic and rotational axes of the star are tilted about the rotational axis of the disc. We observed that in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::76ab0fc56809e293fad254bce7fe16e2
http://arxiv.org/abs/2012.10826
http://arxiv.org/abs/2012.10826
Autor:
Marina M. Romanova, A. A. Blinova, Galina V. Ustyugova, A. V. Koldoba, Richard V. E. Lovelace
Publikováno v:
New Astronomy. 62:94-114
We investigate the properties of magnetized stars in the propeller regime using axisymmetric numerical simulations. We modelled the propeller regime for stars with realistically large magnetospheres (5-7 stellar radii), so that our results could be a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2856b6f43234860927c94673c09ac1b0
https://doi.org/10.1016/j.newast.2018.01.011
https://doi.org/10.1016/j.newast.2018.01.011
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 477:127-138
We numerically investigate the generation of a magnetic field in a protostellar disc via an $\alpha \Omega$-dynamo and the resulting magnetohydrodynamic (MHD) driven outflows. We find that for small values of the dimensionless dynamo parameter $\alph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e7ee5fe7962bfcaf462786e725b58fd
https://doi.org/10.1093/mnras/sty614
https://doi.org/10.1093/mnras/sty614
Publikováno v:
Mathematical Models and Computer Simulations. 10:111-119
An algorithm is presented, which enables us to use the iterative Richardson method for solving a system of linear algebraic equations with the matrix corresponding to a sign-definite selfadjoint operator, in the absence of information about the lower
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c1b8e0b5b55c746480ca82dd3126ee5
https://doi.org/10.1134/s2070048218010106
https://doi.org/10.1134/s2070048218010106