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Information × Registration Number 0220U101270, 0116U008495 , R & D reports Title Generation, spreading and diffusing of the waves in springy-fluid system popup.stage_title Head Grinchenko Viktor T., Доктор фізико-математичних наук Registration Date 07-02-2020 Organization Institute of Hydromechanics of NAS of Ukraine popup.description2 The purpose of the study is the investigation of emergence of stable self-oscillations in the flow in channels with consistently located sharp narrowing of the cross-section (stenoses), the description of sound radiation by such flows and the propagation of sound waves in open waveguides, the numerical simulation of such flows with account for sound radiation. Development of mathematical models and algorithms that allow not only qualitative but also quantitative assessment of the energy and spatial characteristics of acoustic fields generated by the flow as it passes through solid obstacles of different geometries. Development of methods and numerical algorithms for describing eddy sound sources in irregular channels of complex geometry. The development of algorithms for calculation of acoustic fields based on hybrid methods of aero- and hydroacoustics and modern numerical approaches of computer hydromechanics that allow one to parallelize the calculations and perform numerical simulations on cluster supercomputers using a large number of CPU. The constructed algorithms are applied in the work to the problem of acoustic field generation by air flow in an irregular channel with two consecutive stenoses. Hydrodynamic feedbacks that cause self-oscillations in such flows are carefully described. A detailed description of the energy and spatial characteristics of the acoustic fields generated by such a flow is given. Research Method: A complex numerical algorithm for solving the problem of sound generation by flow during its interaction with solid obstacle, which belongs to the class of hybrid methods, is constructed. The method allows us to numerically describe the dynamical process of conversion of the flow energy into the acoustic energy. Hybrid methods allow us to split the solution of the problem into two steps. At the first step, the problem of hydromechanics is numerically solved, at the second step the problem of acoustics is solved Product Description popup.authors Basovsky Volodymyr G. Borisyuk Andriy O. Vovk Igor V. Horodetska Natalija S. Malyuga Volodymyr S. Ostroverkh Borys M. Sidko Mariya I. Savytskyi Oleh A. Sobol Tetiana V. Starovoit Inna V. popup.nrat_date 2020-04-02 Close