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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">izvuzmath</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Математика</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3446</issn><issn pub-type="epub">2076-4626</issn><publisher><publisher-name>Казанский (Приволжский) федеральный университет</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26907/0021-3446-2025-8-34-55</article-id><article-id custom-type="elpub" pub-id-type="custom">izvuzmath-211</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Вычислительный метод для нелинейной системы двухпараметрических сингулярно возмущенных задач, моделирующих процессы реакции-конвекции-диффузии</article-title><trans-title-group xml:lang="en"><trans-title>Computational method for a nonlinear system of two-parameter singular perturbation problems modeling reaction-convection-diffusion processes</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>Мариаппан</surname><given-names>М.</given-names></name><name name-style="western" xml:lang="en"><surname>Mariappan</surname><given-names>M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Маникандан Мариаппан</p><p>Бангалор, 560064, Индия</p></bio><bio xml:lang="en"><p>Manikandan MariappanBengaluru, 560064 </p></bio><email xlink:type="simple">manimaths89@yahoo.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет Президенси (Бангалор)</institution><country>Индия</country></aff><aff xml:lang="en"><institution>Presidency University</institution><country>India</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2025</year></pub-date><volume>1</volume><issue>8</issue><fpage>34</fpage><lpage>55</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мариаппан М., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Мариаппан М.</copyright-holder><copyright-holder xml:lang="en">Mariappan M.</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://izvuzmath.elpub.ru/jour/article/view/211">https://izvuzmath.elpub.ru/jour/article/view/211</self-uri><abstract><p>Рассматриваются построение и анализ вычислительного метода для системы двухпараметрических сингулярно возмущенных нелинейных дифференциальных уравнений второго порядка, моделирующих процессы реакции-конвекции-диффузии, при заданных граничных условиях. Адаптированный сеточный метод состоит из классической конечно-разностной схемы вместе с сеткой Шишкина, которая строится для решения данной системы. Доказывается, что адаптированный сеточный метод обладает равномерной сходимостью существенно первого порядка по отношению к параметрам возмущения. Для нахождения численных приближений разработан алгоритм, использующий метод продолжения. Численные эксперименты подтверждают теоретические результаты. Поскольку в литературе отсутствуют исследования, посвященные системам двухпараметрических сингулярно возмущенных нелинейных дифференциальных уравнений, настоящее исследование выявляет особенности таких систем и способствует их численному решению.</p></abstract><trans-abstract xml:lang="en"><p>This article aims at the construction and analysis of a computational method for a system of two-parameter singularly perturbed second-order nonlinear differential equations with prescribed boundary conditions modeling reaction-convection-diffusion processes. A fitted mesh method consists of a classical finite difference scheme together with a Shishkin mesh constructed to solve the system. The fitted mesh method is proved to be convergent essentially first-order uniformly with respect to the perturbation parameters. An algorithm using the continuation method is designed to compute the numerical approximations. Numerical experiments support the theoretical results. Since there is no literature on systems of two-parameter singularly perturbed nonlinear differential equations, the present study reveals the characteristics of such systems and contributes to their numerical solution.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>система двухпараметрических сингулярно возмущенных задач</kwd><kwd>граничный слой</kwd><kwd>нелинейное дифференциальное уравнение</kwd><kwd>конечно-разностная схема</kwd><kwd>сетка Шишкина</kwd><kwd>равномерная по параметру сходимость</kwd></kwd-group><kwd-group xml:lang="en"><kwd>system of two-parameter singular perturbation problems</kwd><kwd>boundary layer</kwd><kwd>nonlinear differential equation</kwd><kwd>finite difference scheme</kwd><kwd>shishkin mesh</kwd><kwd>parameter uniform convergence</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bhol E. 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