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Information × Registration Number 0224U033490, (0123U100820) , R & D reports Title Assessment of acoustic fields generated by various-scale vortex structures in the - and supersonic flows popup.stage_title Розроблення аналітично-чисельного методу розв'язування задач генерації звуку збуреними течіями у каналах з локальними звуженнями. В рамках методу для знаходження поля течії використовуються методи функцій Гріна і власних функцій, а для визначення акустичного поля -- раніше розроблена теорія генерації звуку обмеженою областю збуреної течії у каналі. Проведення тестування розробленого методу для типових значень параметрів течії, каналу і звужень. Head Hrinchenko Viktor T., д.ф.-м.н. Registration Date 28-12-2024 Organization The Institute of Hydromechanics of the National Academy of Sciences of Ukraine popup.description1 The main goal of scientific research is the development of scientific foundations for the analysis of wave propagation processes and the interaction of wave fields with fluid flows and elastic bodies. It is planned to consider problems of sound generation by fluid flows, as well as problems of flow generation by sound waves, including their influence on the structure of flows. When studying the generation of sound by an unsteady flow of a compressible fluid, research is focused on the study and analysis of the most significant sources of sound. Numerical analytical, semi-empirical, and hybrid methods are used for quantitative assessment of energy and spatial characteristics of sound fields, which require the use of powerful cluster computers and parallel computing technology. popup.description2  This report summarizes the results of research devoted to the development of an analytical-numerical method for solving coupled problems of acoustic radiation of flows in straight channels of circular cross-section with local constrictions. The report consists of two parts. The first part (section 1) describes the method itself. In it, the found parameter fields of the flow disturbed by the narrowing are used to describe the sound sources, and the methods of Green's functions and normal modes, as well as methods of correlation-spectral analysis, are used to find the flow field and the acoustic field. The second part of the report (section 2) is devoted to the testing of the mentioned method. Here, the results of its application to solving the problem of sound radiation by a stationary flow in a straight rigid channel of circular cross-section with a local axisymmetric constriction are presented. Product Description popup.authors Borysiuk Аndrii О. Hrinchenko Viktor T. Sobol Тetiana V. popup.nrat_date 2024-12-28 Close