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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">Journal of Experimental and Theoretical Physics</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Experimental and Theoretical Physics</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал экспериментальной и теоретической физики</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-4510</issn><issn publication-format="electronic">3034-641X</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">258993</article-id><article-id pub-id-type="doi">10.31857/S0044451024040138</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">THERMODYNAMIC CRITERION OF NEUTRAL STABILITY OF SHOCK WAVES IN HYDRODYNAMICS AND ITS IMPLICATIONS</article-title><trans-title-group xml:lang="ru"><trans-title>ТЕРМОДИНАМИЧЕСКИЙ КРИТЕРИЙ НЕЙТРАЛЬНОЙ УСТОЙЧИВОСТИ УДАРНЫХ ВОЛН В ГИДРОДИНАМИКЕ И ЕГО СЛЕДСТВИЯ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Konyukhov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Конюхов</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>konyukhov_av@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Joint Institute for High Temperatures of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Объединенный институт высоких температур Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2024</year></pub-date><volume>165</volume><issue>4</issue><issue-title xml:lang="en">VOL 165, NO4 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 165, №4 (2024)</issue-title><fpage>589</fpage><lpage>602</lpage><history><date date-type="received" iso-8601-date="2024-07-05"><day>05</day><month>07</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</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/"/></permissions><self-uri xlink:href="https://journals.rcsi.science/0044-4510/article/view/258993">https://journals.rcsi.science/0044-4510/article/view/258993</self-uri><abstract xml:lang="en"><p>It is shown that the Kontorovich criterion for neutral stability of relativistic shock waves (the relativistic analog of the Dyakov-Kontorovich criterion in classical hydrodynamics), after eliminating the derivative along the Taub-Hugoniot shock adiabat using relations at the relativistic shock-wave discontinuity, reduces to a constraint on the isenthalpic derivative of internal energy with respect to specific volume in the rest frame: <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mi>p</mi><mo>&gt;</mo><mo>-</mo><msub><mfenced><mfrac><mrow><mo>∂</mo><mi>ϵ</mi></mrow><mrow><mo>∂</mo><mi>v</mi></mrow></mfrac></mfenced><mrow><mspace/><mi>ω</mi></mrow></msub><mo>&gt;</mo><msub><mi>p</mi><mn>0</mn></msub></math>. The obtained formulation is also valid in classical hydrodynamics. The implications of this formulation for shock waves with single-phase and two-phase final states in a medium with first-order phase transition are derived. The influence of the Riedel parameter and isochoric heat capacity on the realizability of neutrally stable shock waves is shown. In a model problem formulation, the effect of local thermodynamic non-equilibrium on the damping of perturbations of a neutrally stable shock wave is investigated.</p></abstract><trans-abstract xml:lang="ru"><p>Показано, что критерий Конторовича нейтральной устойчивости релятивистских ударных волн (релятивистский аналог критерия Дьякова–Конторовича в классической гидродинамике), после исключения производной вдоль ударной адиабаты Тауба–Гюгонио с использованием соотношений на релятивистском ударно-волновом разрыве, сводится к ограничению на изоэнтальпийную производную внутренней энергии по удельному объему в системе покоя: <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mi>p</mi><mo>&gt;</mo><mo>-</mo><msub><mfenced><mfrac><mrow><mo>∂</mo><mi>ϵ</mi></mrow><mrow><mo>∂</mo><mi>v</mi></mrow></mfrac></mfenced><mrow><mspace/><mi>ω</mi></mrow></msub><mo>&gt;</mo><msub><mi>p</mi><mn>0</mn></msub></math>. Полученная формулировка справедлива и в классической гидродинамике. Выведены следствия данной формулировки для ударных волн с однофазным и двухфазным конечными состояниями в среде с фазовым переходом первого рода. Показано влияние параметра Риделя и изохорной теплоемкости на реализуемость нейтрально устойчивых ударных волн. В модельной постановке задачи исследовано влияние локальной термодинамической неравновесности на затухание возмущений нейтрально устойчивой ударной волны.</p></trans-abstract><kwd-group xml:lang="en"><kwd>relativistic hydrodynamics</kwd><kwd>shock wave</kwd><kwd>neutral stability</kwd><kwd>phase</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа поддержана министерством науки и высшего образования Российской Федерации (государственное задание № 075-01129-23-00).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>S. P. 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