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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">vestnikmephi</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник НИЯУ МИФИ</journal-title><trans-title-group xml:lang="en"><trans-title>Vestnik natsional'nogo issledovatel'skogo yadernogo universiteta "MIFI"</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2304-487X</issn><publisher><publisher-name>National Research Nuclear University "MEPhI"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26583/vestnik.2024.5.3</article-id><article-id custom-type="edn" pub-id-type="custom">KWHCTL</article-id><article-id custom-type="elpub" pub-id-type="custom">vestnikmephi-363</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 МОДЕЛИ И ЧИСЛЕННЫЕ МЕТОДЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICAL MODELS AND NUMERICAL METHODS</subject></subj-group></article-categories><title-group><article-title>ОБ ОДНОМ МЕТОДЕ ПОСТРОЕНИЯ НЕРЕГУЛЯРНОЙ СЕТКИ ДЛЯ ОДНОМЕРНОГО УРАВНЕНИЯ КОНВЕКЦИИ-ДИФФУЗИИ</article-title><trans-title-group xml:lang="en"><trans-title>ON A METHOD FOR CONSTRUCTING AN IRREGULAR GRID  FOR THE ONE-DIMENSIONAL CONVECTION-DIFFUSION EQUATION</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ладыгин</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ladygin</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра «Прикладная математика» (№31), инженер</p></bio><email xlink:type="simple">SALadygin@mephi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Карачурин</surname><given-names>Р. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Karachurin</surname><given-names>R. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра «Прикладная математика» (№31), инженер</p></bio><email xlink:type="simple">RNKarachurin@mephi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шильников</surname><given-names>К. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Shilnikov</surname><given-names>K. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра «Прикладная математика» (№31), доцент</p></bio><email xlink:type="simple">KEShilnikov@mephi.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рябов</surname><given-names>П. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Ryabov</surname><given-names>P. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кафедра «Прикладная математика» (№31), доцент</p></bio><email xlink:type="simple">pnryabov@mephi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский ядерный университет «МИФИ», кафедра прикладной математики</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Nuclear University «MEPhI», Department of Applied Mathematics</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Национальный исследовательский ядерный университет «МИФИ», кафедра прикладной математики;&#13;
Московский физико-технический институт (МФТИ),&#13;
кафедра вычислительной физики</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Nuclear University «MEPhI», Department of Applied Mathematics;&#13;
Moscow Institute of Physics and Technology (MIPT), Department of Computational Physics</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>05</day><month>11</month><year>2024</year></pub-date><volume>13</volume><issue>5</issue><fpage>303</fpage><lpage>315</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ладыгин С.А., Карачурин Р.Н., Шильников К.Е., Рябов П.Н., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Ладыгин С.А., Карачурин Р.Н., Шильников К.Е., Рябов П.Н.</copyright-holder><copyright-holder xml:lang="en">Ladygin S.A., Karachurin R.N., Shilnikov K.E., Ryabov P.N.</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://vestnikmephi.elpub.ru/jour/article/view/363">https://vestnikmephi.elpub.ru/jour/article/view/363</self-uri><abstract><p>В данной работе предлагается новый метод построения нерегулярной сетки для численного решения задач, содержащих одномерное уравнение конвекции-диффузии, часто встречающегося в различных областях вычислительной математики, физики и химии. Традиционные подходы либо используют регулярные сетки с большим числом узлов, либо адаптивные сетки, требующие перестройки на каждом шаге решения, что может быть вычислительно затратным. Наш метод основан на преобразовании неоднородной сетки в равномерную с помощью функции локальных деформаций, определяемой на основе критерия монотонности. Это позволяет получать монотонное решение на сетке с существенно меньшим числом узлов, повышая тем самым экономичность разностной схемы. Мы рассматриваем как стационарное, так и нестационарное уравнения конвекции-диффузии, описывая соответствующие алгоритмы построения сеток для дивергентной и недивергентной форм записи конвективных членов. Приведены примеры применения метода к различным задачам, демонстрирующие его преимущества по сравнению с существующими подходами на регулярных сетках. Представленный подход сочетает в себе преимущества нерегулярных сеток для повышения эффективности решения и использование критерия монотонности для обеспечения устойчивости схемы, расширяя возможности численных методов для дифференциальных уравнений.</p></abstract><trans-abstract xml:lang="en"><p>In this paper, we propose a new method for constructing an irregular grid for the numerical solution of problems containing a one-dimensional convection-diffusion equation, which is often encountered in various fields of computational mathematics, physics, and chemistry. Traditional approaches either use regular grids with a large number of nodes or adaptive grids that require rebuilding at each solution step, which can be computationally expensive. Our method is based on transforming a non-uniform grid into a uniform one using a local deformation function determined based on a monotonicity criterion. This allows us to obtain a monotonic solution on a grid with a significantly smaller number of nodes, thereby increasing the efficiency of the difference scheme. We consider both stationary and non-stationary convection-diffusion equations, describing the corresponding grid construction algorithms for divergent and non-divergent forms of recording convective terms. Examples of applying the method to various problems are given, demonstrating its advantages over existing approaches on regular grids. The presented approach combines the advantages of irregular grids to improve the solution efficiency and the use of a monotonicity criterion to ensure the stability of the scheme, expanding the capabilities of numerical methods for differential equations.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>нерегулярные сетки</kwd><kwd>дифференциальные уравнения</kwd><kwd>уравнение конвекции-диффузии</kwd><kwd>численные методы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>irregular grids</kwd><kwd>differential equations</kwd><kwd>convection-diffusion equation</kwd><kwd>numerical methods.</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 23-41-00070, https://rscf.ru/project/23-41-00070/</funding-statement><funding-statement xml:lang="en">The study was supported by the Russian Science Foundation grant No. 23-41-00070, https://rscf.ru/project/23-41-00070/</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">Годунов С.К., Рябенький В.С. 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