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Многопалубные структуры в задачах обтекания поверхностей с малыми периодическими возмущениями
С. 92-94.
Language:
Russian
In book
Т. 2: Механика жидкости и газа. , Уфа : РИЦ БашГУ, 2019
Danilov V., Gaydukov R., Mathematical notes 2015 Vol. 98 No. 4 P. 561-571
We consider the problem of a viscous incompressible fluid flow along a flat plate with a small solitary perturbation (of hump, step, or corner type) for large Reynolds numbers. We obtain an asymptotic solution in which the boundary layer has a double-deck structure. ...
Added: September 27, 2015
Danilov V., Gaydukov R., Russian Journal of Mathematical Physics 2015 Vol. 22 No. 2 P. 161-173
A fluid flow along a plate with small irregularities on the surface is considered for large Reynolds numbers. The boundary layer has a double-deck structure, i.e., both a thin boundary layer and the classical Prandtl boundary layer are present. It is proved that the solution of the boundary-value problem thus obtained exists and is unique ...
Added: September 3, 2015
Gaidukov R.K., Danilov V.G., , in : Abstracts: Russian-French Workshop “Mathematical Hydrodynamics”, August 22–27, 2016. : Novosibirsk : [б.и.], 2016. P. 20-22.
We consider a non-stationary problem of an incompressible viscous fluid flow along surfaces with small irregularities for large Reynolds number, which have a formal asymptotic solution with a double-deck structure of the boundary layer. ...
Added: September 28, 2016
Gaydukov R. K., Fonareva A. V., Russian Journal of Mathematical Physics 2019 Vol. 26 No. 3 P. 334-343
The problem of viscous compressible fluid flow in an axially symmetric pipe with small periodic irregularities on the wall is considered for large Reynolds numbers. An asymptotic solution with double-deck structure of the boundary layer and unperturbed core flow is obtained. Numerical investigations of the influence of the density of the core flow on the flow behavior in ...
Added: September 2, 2019
Danilov V., Gaydukov R., В кн. : Волны и вихри в сложных средах: 5-ая Международная научная школа молодых ученых. : М. : МАКС Пресс, 2014. С. 154-157.
Получено асимптотическое решение задачи о течении несжимаемой вязкой жидкости в двумерном канале с малыми неровностями на стенках при больших числах Рейнольдса, а также для случая аксиально-симметричной трубы. Показано, что пограничный слой имеет двухпалубную структуру: тонкий пристеночный пограничный слой, и «толстый» пограничный слой. Представлены результаты численного моделирования течения в пограничных слоях ...
Added: December 24, 2014
Gaydukov R. K., European Journal of Mechanics - B/Fluids 2017 Vol. 66 P. 102-108
We consider the problem of a viscous compressible subsonic fluid flow along a flat plate with small periodic irregularities on the surface for large Reynolds numbers. We obtain a formal asymptotic solution with double-deck structure of the boundary layer. We present the results of numerical simulation of flow in the thin boundary layer (i.e., in ...
Added: July 9, 2017
Gaydukov R., Danilov V., Журнал вычислительной математики и математической физики 2024 № 6
Работа посвящена математическому моделированию фазового перехода лед–вода при течение жидкости внутри трубы с малым ледяным наростом на стенке при больших числах Рейнольдса. В качестве математической модели, описывающей динамику фазового перехода, используется двухпалубная модель пограничного слоя и система фазового поля. Приведены результаты численного моделирования. ...
Added: February 17, 2024
Danilov V. G., Gaydukov R. K., Russian Journal of Mathematical Physics 2017 Vol. 24 No. 1 P. 1-18
The problem of flow of a viscous incompressible fluid in an axially symmetric pipe with small irregularities on the wall is considered. An asymptotic solution of the problem with the double-deck structure of the boundary layer and the unperturbed flow in the environment (the “core flow”) is obtained. The results of flow numerical simulation in ...
Added: September 28, 2016
Gaydukov R., Danilov V., Наноструктуры. Математическая физика и моделирование 2016 Т. 15 № 1 С. 5-102
We study the existence conditions for a double-deck structure of a boundary layer in typical problems of incompressible fluid flow along surfaces with small irregularities (periodic or localized) for large Reynolds number. We obtain characteristic scales (a power of a small parameter included in a solution) which lead to the double-deck structure, and we obtain ...
Added: September 27, 2016
Gaydukov R., Fonaryova A., В кн. : Волны и вихри в сложных средах: 12-ая международная конференция – школа молодых ученых; 01 – 03 декабря 2021 ., Москва: Сборник материалов школы. : ООО «ИСПО- принт», 2021.
Рассмотрена задача о течении, индуцированном вращающимся диском с малыми периодическими (быстроосциллирующими) неровностями на его поверхности. ...
Added: December 14, 2021
Буров Н. А., Gaydukov R., Многофазные системы 2023 Т. 18 № 3 С. 192-195
В работе описана двухпалубная стурктура пограничного слоя в трехмерной задаче обтекания малой локализованной неровности на поверхности пластины при больших значениях числа Рейнольдса ...
Added: January 11, 2024
Grushin V. V., Наноструктуры. Математическая физика и моделирование 2012 Т. 7 № 2 С. 17-44
В работе получено асимптотическое разложение собственных значений оператора Лапласа с нулевыми данными Дирихле в бесконечных трубках, т. е. в бесконечных изогнутых цилиндрах с внутренним кручением при равномерном сжатии поперечных сечений, по малому параметру, характеризующему поперечные размеры трубки. Аналогичное разложение получено для оператора Шредингера с учетом магнитного поля для конечных изогнутых трубок. Предложен метод сведения задачи ...
Added: December 24, 2012
Задорожный А. И., Новгородова В. С., Kovalenko E. V., Вестник Ростовского государственного университета путей сообщения 2011 № 1 С. 165-169
The Maxwell lubricant is widely used as a lubricant in bush bearings. Oscillatory features of the Maxwell viscoelastic layer are studied in the work. It is stated that oscillations have anharmonic character. The comparison of asymptotic solution with the exact one at large and small material viscosity. ...
Added: December 14, 2012
Flamarion M. V., Pelinovsky E., Symmetry 2023 Vol. 15 No. 8 Article 1478
This study aims to explore the complex interactions between an internal solitary wave and
an external force using the Benjamin-Ono equation as the theoretical framework. The investigation
encompasses both asymptotic and numerical approaches. By assuming a small amplitude for the
external force, we derive a dynamical system that describes the behavior of the solitary wave
amplitude and the position ...
Added: July 26, 2023
Protasov V., Mathematics of Computation 2017 Vol. 86 No. 305 P. 1499-1524
For an arbitrary set of nonnegative integers, we consider the Euler binary partition function which equals the total number of binary expansions of an integer with ``digits'' from . By applying the theory of subdivision schemes and refinement equations, the asymptotic behaviour of as is characterized. For all finite , we compute the lower and upper exponents of growth of , find when ...
Added: May 11, 2017
Kuzmina L., Осипов Ю. В., Вестник Московского государственного строительного университета 2013 № 12 С. 20-26
A classic pursuit problem is studied in which two material points - a Pursuer and a Pursued - move in a plane at constant speeds. The velocity vector of the Pursued does not change its direction and the velocity vector of the Pursuer turns and always aims at the Pursued. If the Pursuer moves at ...
Added: November 14, 2013
Л.И. Кузьмина, Осипов Ю. В., International Journal for Computational Civil and Structural Engineering 2017 Т. 13 № 1 С. 63-68
Filtration of the suspension in a porous medium with a geometric particle capture mechanism is considered. The porous medium has an initial deposit unevenly distributed across the filter. The nonlinear model of deep bed filtration suggests that the porosity and permeability of the porous medium depend on the deposit. The asymptotics of the movable boundary ...
Added: January 6, 2018
V.S. Samovol, Asymptotic Analysis 2019 Vol. 115 P. 223-239
The Riccaty equation with coefficients having power asymptotic in a neighbourhood of infinity is studied. We examine the solutions to these equations and describe their asymptotic form ...
Added: November 24, 2019
Л.И. Кузьмина, Осипов Ю. В., Вестник Московского государственного строительного университета 2014 № 7 С. 34-40
A classic pursuit problem is studied in which two material points - a Pursuer and a Pursued - move in a plane at constant speeds. The velocity vector of the Pursued does not change its direction and the velocity vector of the Pursuer turns and always aims at the Pursued. If the Pursuer moves at ...
Added: August 3, 2014
Gaydukov R., Сибирские электронные математические известия 2024 Т. 21 № 1 С. 178-187
In this paper we study a Rayleigh-type equation on a semi-infinite cylinder with a Coulomb-type potential.
This equation arises in the double-deck boundary layer structure in the problem of flow induced by a uniformly rotating disk with small periodic irregularities on its surface for large Reynolds numbers. Using combined numerical and analytical approach, the existence of ...
Added: February 17, 2024
Danilov V., Albeverio S., Russian Journal of Mathematical Physics 2011 Vol. 18 No. 1 P. 10-25
The goal in this paper is to demonstrate a new method for constructing global-in-time approximate (asymptotic) solutions of (pseudodifferential) parabolic equations with a small parameter. We show that, in the leading term, such a solution can be constructed by using characteristics, more precisely, by using solutions of the corresponding Hamiltonian system and without using any ...
Added: April 12, 2012
Grushin V. V., Математические заметки 2017 Т. 102 № 6 С. 816-827
Asymptotic formulas are obtained for a class of integrals that are Fourier transforms of rapidly oscillating functions. These formulas contain special functions and generalize the well-known method of stationary phase. ...
Added: January 13, 2018
Fonaryova A., В кн. : Межвузовская научно-техническая конференция студентов, аспирантов и молодых специалистов им. Е.В. Арменского. Материалы конференции. : М. : МИЭМ НИУ ВШЭ, 2020. С. 53-55.
В работе построено формальное асимптотическое решение задачи о дозвуковом нестационарном течении вязкой сжимаемой жидкости в двумерном канале с малыми периодическими неровностями на стенках при больших значениях числа Рейнольдса. Проведено численное моделирование, демонстрирующее влияние плотности основного потока на поведение в пристеночной области. ...
Added: February 8, 2022
Gaydukov R., Сибирский журнал вычислительной математики 2022 Т. 15 № 2 С. 97-109
A viscous liquid flow along a semi-infinite plate with small periodic irregularities on the surface was
considered for large Reynolds numbers. The flow near the plate is described by Prandtl equations with
induced pressure which are non-classical PDE, because they contain a limiting term. The main goal is to
construct a numerical algorithm for solving these equations with ...
Added: June 10, 2020