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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">nuc</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник НЯЦ РК</journal-title><trans-title-group xml:lang="en"><trans-title>NNC RK Bulletin</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1729-7516</issn><issn pub-type="epub">1729-7885</issn><publisher><publisher-name>Национальный ядерный центр Республики Казахстан</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.52676/1729-7885-2025-2-151-164</article-id><article-id custom-type="elpub" pub-id-type="custom">nuc-836</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>СОВЕРШЕНСТВОВАНИЕ МЕТОДОВ МОДЕЛИРОВАНИЯ ПЛАВЛЕНИЯ ТВС В УСЛОВИЯХ ЭКСПЕРИМЕНТАЛЬНЫХ ИССЛЕДОВАНИЙ НА РЕАКТОРЕ ИГР</article-title><trans-title-group xml:lang="en"><trans-title>IMPROVEMENT OF METHODS FOR MODELING THE MELTING OF FUEL ASSEMBLIES IN THE CONDITIONS OF AN EXPERIMENT ON IGR RECTOR</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3541-2569</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Қабдылқақов</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kabdylkakov</surname><given-names>E. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">kabdylkakov@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5250-2852</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сураев</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Suraev</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">suraev@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1049-1726</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Жанболатов</surname><given-names>О. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhanbolatov</surname><given-names>O. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">zhanbolatov@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3321-8682</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Витюк</surname><given-names>Г. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Vityuk</surname><given-names>G. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">Shmeleova@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5684-2341</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иркимбеков</surname><given-names>Р. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Irkimbekov</surname><given-names>R. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">irkimbekov@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Филиал «Институт атомной энергии» РГП НЯЦ РК<country>Казахстан</country></aff><aff xml:lang="en">Branch “Institute of Atomic Energy” RSE NNC RK<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>14</day><month>07</month><year>2025</year></pub-date><volume>0</volume><issue>2</issue><fpage>151</fpage><lpage>164</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Қабдылқақов Е.А., Сураев А.С., Жанболатов О.М., Витюк Г.А., Иркимбеков Р.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Қабдылқақов Е.А., Сураев А.С., Жанболатов О.М., Витюк Г.А., Иркимбеков Р.А.</copyright-holder><copyright-holder xml:lang="en">Kabdylkakov E.A., Suraev A.S., Zhanbolatov O.M., Vityuk G.A., Irkimbekov R.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://journals.nnc.kz/jour/article/view/836">https://journals.nnc.kz/jour/article/view/836</self-uri><abstract><p>Экспериментальное исследование процесса разрушения топлива на реакторе ИГР позволяет получать данные о процессах, происходящих в тепловыделяющих сборках различных видов ядерных реакторов во время тяжелых аварий. Одним из этапов тяжелых аварий является плавление ядерного топлива и его перемещение. В данной работе рассмотрено комплексное применение физических моделей в ANSYS FLUENT для достижения явного динамического плавления элементов тепловыделяющей сборки. Расчетные исследования проводятся на двухмерной модели экспериментального реакторного устройства. Применяются расчетные модели «volume of fluid» и «solidification melting» которые позволяют моделировать движение расплавленных элементов тепловыделяющей сборки. Для задания сложного профиля энерговыделения использована пользовательская функция (User defined function – UDF). В результате получена картина, демонстрирующая все стадии развития контролируемой аварийной ситуации в экспериментальном устройстве во время реакторного пуска от начала плавления наиболее разогретых элементов до динамичного перемещения многокомпонентного расплава.</p></abstract><trans-abstract xml:lang="en"><p>Experimental studies of the process of fuel destruction at the IGRY reactor make it possible to obtain data on the processes occurring in the fuel assemblies of various types of nuclear reactors during severe accidents. One of the stages of severe accidents is the melting of nuclear fuel. One of the stages of severe accidents is the melting of nuclear fuel. In this paper, we consider the complex application of physical models of the ANSYS FLUENT software module to achieve explicit dynamic melting of elements of a fuel assembly. Computational studies are carried out on a two-dimensional model of an experimental reactor device. The calculation models «volume of fluid» and «solidification melting» are used, which allow modeling the movements of the liquid fraction of the elements of the fuel assembly. To set the energy release, a user defined function (UDF) of the Fluent module is used.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>экспериментальное устройство</kwd><kwd>безопасность</kwd><kwd>расплав</kwd><kwd>метод объема жидкости</kwd><kwd>фазовый переход</kwd><kwd>пользовательская функция</kwd><kwd>энерговыделение</kwd><kwd>ANSYS FLUENT.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>experimental device</kwd><kwd>safety</kwd><kwd>melt</kwd><kwd>volume of fluid</kwd><kwd>phase transition</kwd><kwd>user defined function</kwd><kwd>energy release</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена в рамках проекта грантового финансирования АР19577709 «Развитие методов CFD моделирования для описания процессов, сопровождающих развитие тяжелой аварии ядерного энергетического реактора».</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">https://www.gen-4.org/generation-iv-criteria-andtechnologies/sodium-fast-reactor-sfr</mixed-citation><mixed-citation xml:lang="en">https://www.gen-4.org/generation-iv-criteria-andtechnologies/sodium-fast-reactor-sfr</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Batyrbekov E. et al. 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