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Zh. Vychisl. Mat. Mat. Fiz., 2019, Volume 59, Number 10, Pages 1792–1802 (Mi zvmmf10973)  

Change in separation flow regimes over obstacles in subsonic gas flow as a manifestation of viscous forces: numerical results

A. D. Savel'ev

Dorodnicyn Computing Center, Federal Research Center "Computer Science and Control," Russian Academy of Sciences, Moscow, 119333 Russia

Abstract: The unsteady subsonic viscous gas flows over forward- and backward-facing steps on a flat surface are numerically simulated at a free-stream Mach number of 0.1 by applying compact difference schemes of the 14th order of accuracy. The characteristics of the boundary layer separation zones are investigated at Reynolds numbers ranging from 10$^3$ to 10$^7$. The computations are based on the nonstationary Navier–Stokes equations supplemented, if necessary, with the formulas of the one-parameter differential SA model of turbulent viscosity. The conditions for pulsing separation zones arising in the boundary layer are determined, and the subsequent transition to a turbulent flow regime is physically justified.

Key words: subsonic viscous gas flows, flow separation, boundary layer instability, high-order difference schemes.

DOI: https://doi.org/10.1134/S0044466919100120


English version:
Computational Mathematics and Mathematical Physics, 2019, 59:10, 1732–1741

Bibliographic databases:

UDC: 519.634
Received: 01.04.2019
Revised: 17.05.2019
Accepted:10.06.2019

Citation: A. D. Savel'ev, “Change in separation flow regimes over obstacles in subsonic gas flow as a manifestation of viscous forces: numerical results”, Zh. Vychisl. Mat. Mat. Fiz., 59:10 (2019), 1792–1802; Comput. Math. Math. Phys., 59:10 (2019), 1732–1741

Citation in format AMSBIB
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\jour Zh. Vychisl. Mat. Mat. Fiz.
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\pages 1792--1802
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