T. Yu. Balabina, Yu. N. Deryugin, E. A. Kudryashov

RFNC - VNIIEF (Sarov, Russia)

Abstract. This article presents the results of a numerical study of the turbulent flows’ structure in the construction elements under consideration, for which grid models are constructed that correspond to turbulence modeling approaches. More specifically, these approaches invoke Reynolds Averaged Navier-Stokes equations (RANS), equations closed using one or another semi-empirical turbulence model, as well as vortex–resolving approach, in particular, the method of large vortices modeling (Large Eddy Simulation – LES). The flow calculations were performed both in stationary and non-stationary settings using the LOGOS complex on a parallel supercomputer. From the analysis of the results obtained, it is concluded that the averaged flow parameters found within a non-stationary formulation using a zone RANS-LES transition in the turbulence model qualitatively and quantitatively better coincide with experimental data than the results of stationary calculations based on the use of the RANS approach. Verification of the numerical technique was carried out by experimental data obtained on the FT-18 aerodynamic stand on the basis of Nizhny Novgorod State Technical university named after R.E. Alekseev. A quantitative criterion for the effect of structural changes on the uniformity of the flow is the vorticity level.

Key Words: numerical modeling, gas turbulent flow structure, Navier-Stokes equations, Reynolds averaging, grid models

For citation: T. Yu. Balabina, Yu. N. Deryugin, E. A. Kudryashov. Numerical simulation of turbulent flow in a channel with a bend. Zhurnal Srednevolzhskogo matematicheskogo obshchestva. 26:4(2024), 424–441. DOI: https://doi.org/10.15507/2079-6900.26.202404.424-441

Information about the authors:

Tatiana Yu. Balabina, Head of the Research Group, Department of the Institute of Laser Physics Research, RFNC-VNIIEF (10 Muzrukov Ave, Sarov, Nizhny Novgorod region, 607188, Russia), ORCID: http://orcid.org/0000-0001-5765-5014, kaktus2401@mail.ru, tybalabina@vniief.ru

Yuriy N. Deryugin, D. Sci. (Physics and Mathematics), Chief Researcher, Department of the Institute of Theoretical and Mathematical Physics, RFNC-VNIIEF (10 Muzrukov Ave, Sarov, Nizhny Novgorod region, 607188, Russia), ORCID: https://orcid.org/0000-0002-3955-775X, dyn1947@yandex.ru

Evgeny A. Kudryashov, Head of the Research Group, Department of the Institute of Laser Physics Research, RFNC-VNIIEF (10 Muzrukov Ave, Sarov, Nizhny Novgorod region, 607188, Russia), http://orcid.org/0009-0000-7407-8191, eakudryashov@vniief.ru