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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">Doklady Physics</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Physics</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Физика, технические науки</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7400</issn><issn publication-format="electronic">3034-5081</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">697843</article-id><article-id pub-id-type="doi">10.7868/S3034508125050092</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>МЕХАНИКА</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">SUPERPOSITION OF TWO NONSTEADY ONE-DIMENSIONAL SHEARS IN A PLANE VISCOUS LAYER</article-title><trans-title-group xml:lang="ru"><trans-title>СУПЕРПОЗИЦИЯ ДВУХ НЕСТАЦИОНАРНЫХ ОДНОМЕРНЫХ СДВИГОВ В ПЛОСКОМ ВЯЗКОМ СЛОЕ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Georgievskii</surname><given-names>D. V.</given-names></name><name xml:lang="ru"><surname>Георгиевский</surname><given-names>Д. В.</given-names></name></name-alternatives><email>georgiev@mech.math.msu.su</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ishlinskii Institute for Problems in Mechanics, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт проблем механики им. А.Ю. Ишлинского Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>524</volume><issue>1</issue><issue-title xml:lang="en">VOL 524, NO1 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 524, №1 (2025)</issue-title><fpage>59</fpage><lpage>62</lpage><history><date date-type="received" iso-8601-date="2025-12-05"><day>05</day><month>12</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="2026-09-15"/></permissions><self-uri xlink:href="https://jdigitaldiagnostics.com/2686-7400/article/view/697843">https://jdigitaldiagnostics.com/2686-7400/article/view/697843</self-uri><abstract xml:lang="en"><p>The stability of the unsteady flow of a Newtonian viscous medium, which is a superposition of two one-dimensional orthogonal shears in a layer between parallel planes, relative to the three-dimensional picture of kinematic perturbations, is investigated. Using the method of integral relations, sufficient integral estimates of the development of initial disturbances and their non-growth over an infinite time interval are derived. The cases of stationary main motion, acceleration and deceleration in different directions are considered.</p></abstract><trans-abstract xml:lang="ru"><p>Исследуется устойчивость относительно трехмерной картины кинематических возмущений нестационарного течения ньютоновской вязкой среды, являющегося суперпозицией двух ортогональных друг другу одномерных сдвигов в слое между параллельными плоскостями. С помощью метода интегральных соотношений выводятся достаточные интегральные оценки развития начальных возмущений и их невозрастания на бесконечном интервале времени. Рассматриваются случаи стационарного основного движения, разгона и торможения в разных направлениях.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Newtonian fluid</kwd><kwd>shear</kwd><kwd>unsteady flow</kwd><kwd>plane layer</kwd><kwd>perturbation</kwd><kwd>stability</kwd><kwd>quadratic functional</kwd><kwd>method of integral relations</kwd><kwd>integral estimates</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>ньютоновская вязкая среда</kwd><kwd>сдвиг</kwd><kwd>нестационарное течение</kwd><kwd>плоский слой</kwd><kwd>возмущение</kwd><kwd>устойчивость</kwd><kwd>квадратичный функционал</kwd><kwd>метод интегральных соотношений</kwd><kwd>интегральные оценки</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа поддержана Российским научным фондом (грант № 24-21-20008).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Georgievskii D.V. Sufficient energy estimates of stability of unsteady combined shear flows in a cylindrical layer // Izv. RAN. MZhG. 2024. № 6. P. 51–59.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Kozyrev O.R., Stepanyan Yu.A. Method of integral relations in the linear theory of hydrodynamic stability // Itogi nauki i tekhniki. Ser. Mekhanika zhidkosti i gaza. M.: VINITI, 1991. V. 25. P. 3–89.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Georgievskii D.V. Selected problems of continuum mechanics. 2nd ed. M.: URSS, 2020. 560 p.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Georgievskii D.V., Putkaradze V.G. Energy-based stability estimates for incompressible media with tensor-nonlinear constitutive relations // Continuum Mechanics and Thermodynamics. 2023. V. 35. № 4. P. 1403–1415.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Martynyuk A.A., Lakimshkin V., Lila S. Stability of motion: method of integral inequalities. Kiev: Nauk. dumka, 1989. 272 p.</mixed-citation></ref></ref-list></back></article>
