Computational Mathematics and Mathematical Physics

, Volume 59, Issue 10, pp 1732–1741 | Cite as

Change in Separation Flow Regimes over Obstacles in Subsonic Gas Flow as a Manifestation of Viscous Forces: Numerical Results

  • A. D. Savel’evEmail author


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 103 to 107. 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.


subsonic viscous gas flows flow separation boundary layer instability high-order difference schemes 



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© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Dorodnicyn Computing Center, Federal Research Center “Computer Science and Control,” Russian Academy of SciencesMoscowRussia

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