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POD-analysis of the near field of a turbulent circular jet when mixing gases of different densities

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Thermophysics and Aeromechanics Aims and scope

Abstract

A turbulent circular jet with variable density caused by the mixing of air with gases of different densities (air, helium, and carbon dioxide) is studied. The Reynolds number is fixed for all cases: Re = 5300. Using proper orthogonal decomposition and direct numerical simulation data, a comparative analysis of the three gases under consideration is carried out. It is shown that with a decrease in the ambient gas density, the frequency of coherent structures formation drops, and the number of proper orthogonal decomposition (POD) modes necessary for constructing a low-dimensional flow model decreases.

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

    V. A. Ivashchenko, E. V. Palkin, V. O. Ryzhenkov & R. I. Mullyadzhanov

  2. Novosibirsk State University, Novosibirsk, Russia

    V. A. Ivashchenko, E. V. Palkin, V. O. Ryzhenkov & R. I. Mullyadzhanov

Authors
  1. V. A. Ivashchenko
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  2. E. V. Palkin
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  3. V. O. Ryzhenkov
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  4. R. I. Mullyadzhanov
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Correspondence to V. A. Ivashchenko.

Additional information

The work was partially supported by the Russian Foundation for Basic Research (Grants No. 18-38-20167 and No. 19-08-01227), the development of the computational code was carried out within the framework of the state task for IT SB RAS.

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Ivashchenko, V.A., Palkin, E.V., Ryzhenkov, V.O. et al. POD-analysis of the near field of a turbulent circular jet when mixing gases of different densities. Thermophys. Aeromech. 28, 55–64 (2021). https://doi.org/10.1134/S0869864321010066

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  • DOI: https://doi.org/10.1134/S0869864321010066

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