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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">kaz29</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Казахстанско-Британского технического университета</journal-title><trans-title-group xml:lang="en"><trans-title>Herald of the Kazakh-British Technical University</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1998-6688</issn><issn pub-type="epub">2959-8109</issn><publisher><publisher-name>Казахстанско-Британский Технический Университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.55452/1998-6688-2025-22-1-259-270</article-id><article-id custom-type="elpub" pub-id-type="custom">kaz29-1751</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICAL SCIENCES</subject></subj-group></article-categories><title-group><article-title>ПРИМЕНЕНИЕ МЕТОДА ФИКТИВНЫХ ОБЛАСТЕЙ ДЛЯ РЕШЕНИЯ УРАВНЕНИЙ НАВЬЕ-СТОКСА С УЧЕТОМ УДВОЕННОЙ СРЕДНЕЙ КРИВИЗНЫ</article-title><trans-title-group xml:lang="en"><trans-title>APPLICATION OF THE FICTITIOUS DOMAIN METHOD FOR SOLVING THE NAVIER-STOKES EQUATIONS CONSIDERING THE DOUBLED MEAN CURVATURE</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7542-3778</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Темирбеков</surname><given-names>Н. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Temirbekov</surname><given-names>N. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физико-математических наук, профессор, академик НИА РК, член-корреспондент НАН РК </p><p>г. Алматы</p></bio><bio xml:lang="en"><p>Doctor of Physical and Mathematical Sciences, Professor, Academician of NEA RK, Corresponding Member of NAS RK </p><p> Almaty </p></bio><email xlink:type="simple">temirbekov@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-1566-1926</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жаксылыкова</surname><given-names>Ж. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhaksylykova</surname><given-names>Zh. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p> сениор-лектор </p><p>г. Усть-Каменогорск</p></bio><bio xml:lang="en"><p> Senior Lecturer  </p><p> Ust-Kamenogorsk </p></bio><email xlink:type="simple">zhaksylykova0507@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Казахский национальный университет им. аль-Фараби,<country>Казахстан</country></aff><aff xml:lang="en">Al-Farabi Kazakh National University<country>Kazakhstan</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Восточно-Казахстанский университет им. С. Аманжолова<country>Казахстан</country></aff><aff xml:lang="en">Sarsen Amanzholov East Kazakhstan University<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>26</day><month>03</month><year>2025</year></pub-date><volume>22</volume><issue>1</issue><fpage>259</fpage><lpage>270</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Темирбеков Н.М., Жаксылыкова Ж.Р., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Темирбеков Н.М., Жаксылыкова Ж.Р.</copyright-holder><copyright-holder xml:lang="en">Temirbekov N.M., Zhaksylykova Z.R.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestnik.kbtu.edu.kz/jour/article/view/1751">https://vestnik.kbtu.edu.kz/jour/article/view/1751</self-uri><abstract><p>В данной работе рассматривается начально-краевая задача для нестационарного течения вязкой несжимаемой жидкости в ограниченной области, решаемая с использованием системы нелинейных уравнений Навье-Стокса. Уравнения описывают движение жидкости с учетом вязкости, давления и массовой силы, а также условия соленоидальности поля скорости. В общем случае нахождение аналитического решения системы уравнений представляет значительные трудности, и до сих пор не доказано, существует ли всегда гладкое решение для всех возможных условий. В связи с этим для решения задачи применяется метод фиктивных областей, позволяющий свести задачу к решению системы дифференциальных уравнений с соответствующими граничными условиями. Особое внимание уделяется введению понятия удвоенной средней кривизны поверхности, которая необходима для применения метода фиктивных областей. Для этого в статье приводится подробное вычисление средней кривизны с использованием параметризации поверхности и матриц первой и второй форм. Также приводится доказательство леммы, связанной с вычислением удвоенной средней кривизны, что имеет важное значение для дальнейших численных методов решения системы уравнений Навье-Стокса. Полученные результаты расширяют область применения метода фиктивных областей в решении задач гидродинамики, особенно в сложных геометриях, и могут быть использованы для разработки более экономичных численных алгоритмов.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we consider an initial-boundary value problem for an unsteady flow of a viscous incompressible fluid in a bounded region, solved using a system of nonlinear Navier-Stokes equations. The equations describe the motion of the fluid considering viscosity, pressure, and mass force, as well as the solenoidality condition of the velocity field. In the general case, finding an analytical solution to the system of equations presents significant difficulties, and it has not yet been proven whether there is always a smooth solution for all possible conditions. In this regard, the fictitious domain method is used to solve the problem, which allows us to reduce the problem by solving a system of differential equations with appropriate boundary conditions. Particular attention is paid to introducing the concept of twice the mean curvature of the surface, which is necessary for the correct application of the fictitious domain method. For this purpose, the article provides a detailed calculation of the mean curvature using surface parameterization and matrices of the first and second forms. Proof of a lemma related to the calculation of twice the mean curvature is also given, which is of great importance for further numerical methods for solving the Navier-Stokes system of equations. The obtained results expand the scope of application of the fictitious domain method in solving hydrodynamic problems, especially in complex geometries, and can be used to develop more efficient numerical algorithms.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>уравнения Навье-Стокса</kwd><kwd>метод фиктивных областей</kwd><kwd>функциональные пространства</kwd><kwd>удвоенная средняя кривизна</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Navier-Stokes equations</kwd><kwd>viscous incompressible fluid</kwd><kwd>initial-boundary value problem</kwd><kwd>fictitious domain method</kwd><kwd>functional spaces</kwd><kwd>double mean curvature</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена при финансовой поддержке Комитета науки Министерства науки и высшего образования Республики Казахстан, ИРН AP22688601, 2024–2026 гг.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Вабищевич П.Н. Метод фиктивных областей для задачи математической физики. – М.: Изд-во МГУ, 1991. – 156 с.</mixed-citation><mixed-citation xml:lang="en">Vabishhevich P.N. (1991) Metod fiktivnyh oblastej dlja zadachi matematicheskoj fiziki. M.:Izd-vo MGU, 156 p. [in Russian]</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Коновалов А.Н. Задачи фильтрации многофазной несжимаемой жидкости. – 3-е изд. Singapure et al.: World Scientific, 1994. – 173 с.</mixed-citation><mixed-citation xml:lang="en">Konovalov A.N. (1994) Zadachi fil'tracii mnogofaznoj neszhimaemoj zhidkosti. Singapure et al.: World Scientific, 173 p. [in Russian]</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Glowinski R. and Kuznetsov Y.A. Distributed Lagrange multipliers based on fictitious domain method for second order elliptic problems // Computer Methods in Applied Mechanics and Engineering. – 2007. – Vol. 196. – P. 1498–1506.</mixed-citation><mixed-citation xml:lang="en">Glowinski R. and Kuznetsov Y.A. (2007) Distributed Lagrange multipliers based on fictitious domain method for second order elliptic problems. Computer Methods in Applied Mechanics and Engineering, vol. 196, pp. 1498–1506.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Glowinski R., Pan T., Hesla T.I., Joseph D.D. and Periaux J. A distributed Lagrange multiplier/fictitious domain method for the simulation of flow around moving rigid bodies: Application to particulate flow // Computer Methods in Applied Mechanics and Engineering. – 2000. – Vol. 184. – P. 241–267.</mixed-citation><mixed-citation xml:lang="en">Glowinski R., Pan T., Hesla T.I., Joseph D.D. and Periaux J. (2000) A distributed Lagrange multiplier/fictitious domain method for the simulation of flow around moving rigid bodies: Application to particulate flow. Computer Methods in Applied Mechanics and Engineering, vol. 184, pp. 241–267.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Girault V., Glowinski R., López H. and J.P. Vila. A boundary multiplier/fictitious domain method for the steady incompressible Navier-Stokes equations // Numerische Mathematik. – 2001. – Vol. 88. – P. 75–103.</mixed-citation><mixed-citation xml:lang="en">Girault V., Glowinski R., López H. and J.P. Vila. (2001) A boundary multiplier/fictitious domain method for the steady incompressible Navier-Stokes equations. Numerische Mathematik, vol. 88, pp. 75–103.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Glowinski R., Pan T., Hesla T.I., Joseph D.D. and J. Périaux. A Fictitious Domain Approach to the Direct Numerical Simulation of Incompressible Viscous Flow past Moving Rigid Bodies: Application to Particulate Flow // Journal of Computational Physics. – 2001. – Vol. 169. – P. 363–426.</mixed-citation><mixed-citation xml:lang="en">Glowinski R., Pan T., Hesla T.I., Joseph D.D. and J. Périaux. (2001) A Fictitious Domain Approach to the Direct Numerical Simulation of Incompressible Viscous Flow past Moving Rigid Bodies: Application to Particulate Flow. Journal of Computational Physics, vol. 169, pp. 363–426.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Темирбеков Н.М. Приближенные методы решения уравнений вязкой жидкости в областях со сложной геометрией. – Алматы, 2000. – 143 с.</mixed-citation><mixed-citation xml:lang="en">Temirbekov N.M. (2000) Priblizhennye metody reshenija uravnenij vjazkoj zhidkosti v oblastjah so slozhnoj geometriej, Almaty,143 p. [in Russian]</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Смагулов Ш.С., Данаев Н.Т., Темирбеков Н.М. Моделирование краевых условий для давления и полного напора в задачах гидродинамики с помощью метода фиктивных областей // Доклады Академии наук России. – 2000. – Т. 374. – № 3. – С. 333–335.</mixed-citation><mixed-citation xml:lang="en">Smagulov Sh.S., Danaev N.T., Temirbekov N.M. (2000) Modelirovanie kraevyh uslovij dlja davlenija i polnogo napora v zadachah gidrodinamiki s pomoshh'ju metoda fiktivnyh oblastej. Doklady Akademii nauk Rossii, vol. 374, no. 3, pp. 333–335. [in Russian]</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Orunkhanov M.K., Smagulov Sh.S. The method of fictitious domains for the Navier-Stokes equations in terms of stream function and velocity of the vortex with inhomogeneous boundary conditions //Computational technologies.Novosibirsk: SB RAS. – 2000. – Vol. 5. – No. 3. – P. 46–53. [in Russian]</mixed-citation><mixed-citation xml:lang="en">Orunkhanov M.K., Smagulov Sh.S. (2000) The method of fictitious domains for the Navier-Stokes equations in terms of stream function and velocity of the vortex with inhomogeneous boundary conditions. Computational technologies.Novosibirsk: SB RAS, vol. 5, no. 3, pp. 46–53. [in Russian]</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Smagulov Sh.S., Temirbekov N.M., Kamaubaev K.S. Modeling by the method of fictitious regions of the boundary condition for pressure in fluid flow problems // Siberian Journal of Computational Mathematics. – Novosibirsk: SB RAS, 2000. – Vol. 3. – No. 1. – P. 57–71.</mixed-citation><mixed-citation xml:lang="en">Smagulov Sh.S., Temirbekov N.M., Kamaubaev K.S. (2000) Modeling by the method of fictitious regions of the boundary condition for pressure in fluid flow problems. Siberian Journal of Computational Mathematics, Novosibirsk: SB RAS, vol.3, no. 1, pp. 57–71.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Smagulov Sh.S., Otelbaev M.O. On a new method of approximate solutions of nonlinear equations in an arbitrary domain // Computational Technology. – 2001. – Vol. 6. – No. 6. – P. 93–107.</mixed-citation><mixed-citation xml:lang="en">Smagulov Sh.S., Otelbaev M.O. (2001) On a new method of approximate solutions of nonlinear equations in an arbitrary domain. Computational Technology, vol. 6, no. 6, pp. 93–107.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Temirbekov A.N., Danaev N.T. The method of fictitious regions for the model of the atmospheri boundary layer // Bulletin of KazNU, Mathematics, Mechanics, computer science series. – 2014. – No. 2(81). – P. 98–107.</mixed-citation><mixed-citation xml:lang="en">Temirbekov A.N., Danaev N.T. (2014) The method of fictitious regions for the model of the atmospheri boundary layer. Bulletin of KazNU, Mathematics, Mechanics, computer science series, no. 2(81), pp. 98–107.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Temirbekov A.N., Wójcik W. Numerical Implementation of the Fictitious Domain Method for Elliptic Equations // International Journal of Electronics and Telecommunications. – 2014. – Vol. 60. – No. 3. – P. 219–223.</mixed-citation><mixed-citation xml:lang="en">Temirbekov A.N., Wójcik W. (2014) Numerical Implementation of the Fictitious Domain Method for Elliptic Equations. International Journal of Electronics and Telecommunications, vol. 60, no. 3, pp. 219–223.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Temirbekov A.N. Numerical implementation of the method of fictitious domains for elliptic equations // 3rd International Conference on Analysis and Applied Mathematics. – ICAAM 2016. – Vol. 1759. – P. 020053-1–020053-6. https://doi.org/10.1063/1.4959667.</mixed-citation><mixed-citation xml:lang="en">Temirbekov A.N. (2016) Numerical implementation of the method of fictitious domains for elliptic equations. 3rd International Conference on Analysis and Applied Mathematics, ICAAM, vol. 1759, pp. 020053-1–020053-6. https://doi.org/10.1063/1.4959667.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Temirbekov A., Malgazhdarov Y., Tleulessova A., Temirbekova L. Fictitious Domain Method for the Navier-Stokes Equations. – Известия НАН РК. Серия физико-математическая. – 2021. – № 3. – С. 138–147.</mixed-citation><mixed-citation xml:lang="en">Temirbekov A., Malgazhdarov Y., Tleulessova A., Temirbekova L. (2021) Fictitious Domain Method for the Navier-Stokes Equations, Izvestija NAN RK. Serija fiziko-matematicheskaja, no. 3, pp. 138–147.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Temirbekov A., Zhaksylykova Z., Malgazhdarov Y., Kasenov S. Application of the Fictitious Domain Method for Navier-Stokes Equations // Computers, Materials &amp; Continua. – 2022. – No. 73(1). – P. 2035–2055. https://doi.org/10.32604/cmc.2022.027830.</mixed-citation><mixed-citation xml:lang="en">Temirbekov A., Zhaksylykova Z., Malgazhdarov Y., Kasenov S. (2022) Application of the Fictitious Domain Method for Navier-Stokes Equations. Computers, Materials &amp; Continua, no. 73(1), pp. 2035–2055. https://doi.org/10.32604/cmc.2022.027830.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
