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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Fluid Dynamics</journal-id><journal-title-group><journal-title xml:lang="en">Fluid Dynamics</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Российской академии наук. Механика жидкости и газа</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1024-7084</issn><issn publication-format="electronic">3034-5340</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">691963</article-id><article-id pub-id-type="doi">10.31857/S1024708425030034</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">On Self-Similarity of Laminar Jets</article-title><trans-title-group xml:lang="ru"><trans-title>ОБ АВТОМОДЕЛЬНОСТИ ЛАМИНАРНЫХ СТРУЙ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gaifullin</surname><given-names>A. M</given-names></name><name xml:lang="ru"><surname>Гайфуллин</surname><given-names>А. М</given-names></name></name-alternatives><email>gaifullin@tsagi.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shcheglov</surname><given-names>A. S</given-names></name><name xml:lang="ru"><surname>Щеглов</surname><given-names>А. С</given-names></name></name-alternatives><email>shcheglov@phystech.edu</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Zhukovski Central Aerohydrodynamic Institute</institution></aff><aff><institution xml:lang="ru">Центральный аэрогидродинамический институт им. проф. Н.Е. Жуковского</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-07-15" publication-format="electronic"><day>15</day><month>07</month><year>2025</year></pub-date><issue>3</issue><issue-title xml:lang="en">NO3 (2025)</issue-title><issue-title xml:lang="ru">№3 (2025)</issue-title><fpage>30</fpage><lpage>36</lpage><history><date date-type="received" iso-8601-date="2025-10-04"><day>04</day><month>10</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2025-07-02"/></permissions><self-uri xlink:href="https://rjsvd.com/1024-7084/article/view/691963">https://rjsvd.com/1024-7084/article/view/691963</self-uri><abstract xml:lang="en"><p>The problems of laminar jets that admit self-similar solutions are considered. A method for determining the self-similarity parameter is proposed based on the condition of existence of a solution to equations in self-similar variables under given boundary conditions with only a single self-similarity parameter. In problems of plane free and wall jets the self-similarity parameters are determined analytically. In the problem of a three-dimensional wall jet, the self-similarity parameter is determined using a neural network.</p></abstract><trans-abstract xml:lang="ru"><p>Рассмотрены задачи о ламинарных струях, допускающие автомодельные решения. Предложен способ определения параметра автомодельности, исходя из условия существования решения уравнений в автомодельных переменных при заданных граничных условиях только при одном параметре автомодельности. Параметры автомодельности в задачах о плоских свободной и пристенной струях определены аналитически. Определение параметра автомодельности в задаче о трехмерной пристенной струе осуществляется с помощью нейронной сети.</p></trans-abstract><kwd-group xml:lang="en"><kwd>wall jets</kwd><kwd>self-similarity</kwd><kwd>self-similarity parameter</kwd><kwd>neural networks</kwd><kwd>laminar jet</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>пристенные струи</kwd><kwd>автомодельность</kwd><kwd>параметр автомодельности</kwd><kwd>нейронные сети</kwd><kwd>ламинарная струя</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Научное исследование выполнено за счет гранта российского научного фонда № 23-11-00210, https://rscf.ru/project/23-11-00210/.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Schlichting H. Laminare Strahlausbreitung // ZAMM-Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik. 1933. Jg. 13. No. 4. 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