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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">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18255/1818-1015-2015-5-648-664</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-283</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>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Численное решение уравнения Пуассона в полярных координатах методом коллокаций и наименьших невязок</article-title><trans-title-group xml:lang="en"><trans-title>Numerical Solution of the Poisson Equation in Polar Coordinates by the Method of Collocations and Least Residuals</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>Ворожцов</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vorozhtsov</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>Doctor of physical and mathematical sciences, professor</p></bio><email xlink:type="simple">vorozh@itam.nsc.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>Шапеев</surname><given-names>В. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Shapeev</surname><given-names>V. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физ.-мат. наук, профессор</p></bio><bio xml:lang="en"><p>Doctor of physical and mathematical sciences, professor</p></bio><email xlink:type="simple">vshapeev@ngs.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт теоретической и прикладной механики им. С.А. Христиановича СО РАН, ул. Институтская, 4/1, г. Новосибирск, 630090 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Institutskaya str., 4/1, Novosibirsk, 630090, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт теоретической и прикладной механики им. С.А. Христиановича СО РАН, ул. Институтская, 4/1, г. Новосибирск, 630090 Россия&#13;
&#13;
Новосибирский национальный исследовательский университет, ул. Пирогова, 2, г. Новосибирск, 630090 Россия</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Institutskaya str., 4/1, Novosibirsk, 630090, Russia&#13;
&#13;
Novosibirsk National Research University, &#13;
Pirogov str., 2, Novosibirsk, 630090, Russia</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>20</day><month>10</month><year>2015</year></pub-date><volume>22</volume><issue>5</issue><fpage>648</fpage><lpage>664</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ворожцов Е.В., Шапеев В.П., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Ворожцов Е.В., Шапеев В.П.</copyright-holder><copyright-holder xml:lang="en">Vorozhtsov E.V., Shapeev V.P.</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.mais-journal.ru/jour/article/view/283">https://www.mais-journal.ru/jour/article/view/283</self-uri><abstract><p>Предложен вариант метода коллокаций и наименьших невязок для численного решения уравнения Пуассона в полярных координатах на неравномерных сетках. Путем введения общих криволинейных координат исходное уравнение Пуассона приводится к уравнению Бельтрами. В криволинейных координатах используется равномерная сетка. Неравномерность сетки в плоскости исходных полярных координат обеспечивается с помощью функций, управляющих растяжением сетки и входящих в формулы перехода от полярных координат к криволинейным. Метод верифицирован на двух тестовых задачах, имеющих точные аналитические решения. Результаты расчетов показывают, что если начало радиальной координатной оси не входит в расчетную область, то предлагаемый метод имеет второй порядок точности. Если расчетная область содержит эту сингулярность, то применение неравномерной сетки вдоль радиальной координаты позволяет повысить точность численного решения в 1.7–5 раз по сравнению со случаем равномерной сетки при том же количестве ее узлов.</p></abstract><trans-abstract xml:lang="en"><p>A version of the method of collocations and least residuals is proposed for the numerical solution of the Poisson equation in polar coordinates on non-uniform grids. By introducing general curvilinearcoordinates the original Poisson equation is reduced to the Beltrami equation. A uniform grid is used in curvilinear coordinates. The grid non-uniformity in the plane of the original polar coordinates is ensured with the aid of functions which control the grid stretching and entering the formulas of the passage from polar coordinates to the curvilinear ones. The method was veriﬁed on two test problems having exact analytic solutions. The examples of numerical computations show that if the radial coordinate axis origin lies outside the computational region, the proposed method has the second order of accuracy. If the computational region contains the singularity, the application of a non-uniform grid along the radial coordinate enables an increase in the numerical solution accuracy by factors from 1.7 to 5 in comparison with the uniform grid case at the same number of grid nodes.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>уравнение Пуассона</kwd><kwd>полярные координаты</kwd><kwd>метод коллокаций и наименьших невязок</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Poisson equation</kwd><kwd>polar coordinates</kwd><kwd>the method of collocations and least residuals</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">Peskin C., “Numerical analysis of blood ﬂow in the heart”, J. Comput. 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