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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">vmait</journal-id><journal-title-group><journal-title xml:lang="ru">Computational Mathematics and Information Technologies</journal-title><trans-title-group xml:lang="en"><trans-title>Computational Mathematics and Information Technologies</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2587-8999</issn><publisher><publisher-name>Донской государственный технический университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.23947/2587-8999-2023-7-3-12-19</article-id><article-id custom-type="elpub" pub-id-type="custom">vmait-114</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>Computational Mathematics (Вычислительная математика)</subject></subj-group></article-categories><title-group><article-title>Симметризованные варианты методов Зейделя и верхней релаксации решения двумерных разностных задач эллиптического типа</article-title><trans-title-group xml:lang="en"><trans-title>Symmetrized Versions of the Seidel and Successive OverRelaxation Methods for Solving Two-Dimensional Difference Problems of Elliptic Type</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7744-015X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сидорякина</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sidoryakina</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доцент кафедры математики и информатики, кандидат физико-математических наук</p><p>344003, г. Ростов-на-Дону, пл. Гагарина, 1</p></bio><bio xml:lang="en"><p>Associate Professor of the Department of Mathematics and Computer Science, Candidate of Physical and Mathematical Sciences</p><p>1, Gagarin Sq., Rostov-on-Don, 344003</p><p> </p></bio><email xlink:type="simple">cvv9@mail.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>Соломаха</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Solomakha</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>студент 4 курса кафедры «Математика и информатика»</p><p>344003, г. Ростов-на-Дону, пл. Гагарина, 1</p></bio><bio xml:lang="en"><p>4th year student of the Department of Mathematics and Computer Science</p><p>1, Gagarin Sq., Rostov-on-Don, 344003</p></bio><email xlink:type="simple">solomakha.05@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Донской государственный технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Don State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>06</day><month>10</month><year>2023</year></pub-date><volume>7</volume><issue>3</issue><fpage>12</fpage><lpage>19</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сидорякина В.В., Соломаха Д.А., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Сидорякина В.В., Соломаха Д.А.</copyright-holder><copyright-holder xml:lang="en">Sidoryakina V.V., Solomakha D.A.</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://www.cmit-journal.ru/jour/article/view/114">https://www.cmit-journal.ru/jour/article/view/114</self-uri><abstract><sec><title>Введение</title><p>Введение. Данная статья посвящена рассмотрению вариантов симметризации двухслойных неявных итерационных методов для решения сеточных уравнений, возникающих при аппроксимации краевых задач для двумерных уравнений эллиптического типа. Данные уравнения входят в постановки многих задач гидродинамики, гидробиологии водных систем и др. Сеточные уравнения для данных задач характеризуются большим количеством неизвестных — от 106 до 1010, что приводит к плохой обусловленности соответствующей системы алгебраических уравнений и, как следствие, к существенному росту числа итераций, необходимых для достижения заданной точности. В статье рассмотрен метод снижения числа итераций для относительно простых методов решения сеточных уравнений (метода Зейделя и верхней релаксации).</p></sec><sec><title>Материалы и методы</title><p> Материалы и методы. Рассматриваемые в статье методы решения сеточных уравнений базируются на процедуре симметризованного обхода по строками (или столбцами) сеточной области.</p></sec><sec><title>Результаты исследования</title><p>Результаты исследования. Выполнены численные эксперименты для модельной задачи — разностной задачи Дирихле для уравнения Пуассона, которые демонстрируют сокращение числа итераций по сравнению с базовыми алгоритмами данных методов.</p></sec><sec><title>Обсуждениe и заключения</title><p>Обсуждениe и заключения. Данная работа имеет практическую значимость. Разработанное программное средство позволяет его использовать для решения конкретных физических задач, в том числе как элемента программного комплекса.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. This article is devoted to the consideration of options for symmetrization of two-layer implicit iterative methods for solving grid equations that arise when approximating boundary value problems for two-dimensional elliptic equations. These equations are included in the formulation of many problems of hydrodynamics, hydrobiology of aquatic systems, etc. Grid equations for these problems are characterized by a large number of unknowns — from 106 to 1010, which leads to poor conditionality of the corresponding system of algebraic equations and, as a consequence, to a significant increase in the number of iterations, necessary to achieve the specified accuracy. The article discusses a method for reducing the number of iterations for relatively simple methods for solving grid equations, based on the procedure of symmetrized traversal of the grid region.</p></sec><sec><title>Materials and Methods</title><p>Materials and Methods. The methods for solving grid equations discussed in the article are based on the procedure of symmetrized traversal along the rows (or columns) of the grid area.</p></sec><sec><title>Results</title><p>Results. Numerical experiments have been performed for a model problem — the Dirichlet difference problem for the Poisson equation, which demonstrate a reduction in the number of iterations compared to the basic algorithms of these methods.</p><p>Discussion and Conclusions. This work has practical significance. The developed software allows it to be used to solve specific physical problems, including as an element of a software package.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>двумерная задача эллиптического типа</kwd><kwd>итерационные методы</kwd><kwd>релаксационные методы</kwd><kwd>метод полной релаксации</kwd><kwd>метод Зейделя</kwd><kwd>метод верхней релаксации</kwd></kwd-group><kwd-group xml:lang="en"><kwd>two-dimensional problem of elliptic type</kwd><kwd>iterative methods</kwd><kwd>relaxation methods</kwd><kwd>complete relaxation method</kwd><kwd>Seidel method</kwd><kwd>upper relaxation method</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 22-11-00295. https:// rscf.ru/project/22-11-00295</funding-statement><funding-statement xml:lang="en">The study was supported by the Russian Science Foundation grant No. 22-11-00295. https://rscf. ru/en/project/22-11-00295</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">Meligy Sh.A., Youssef I.K. 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