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

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 investi...

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Bibliographic Details
Published in:Computational mathematics and mathematical physics 2019-10, Vol.59 (10), p.1732-1741
Main Author: Savel’ev, A. D.
Format: Article
Language:English
Subjects:
Boundary layer transition
Computational fluid dynamics
Computational Mathematics and Numerical Analysis
Computer simulation
Differential equations
Flat surfaces
Flow separation
Gas flow
Mach number
Mathematics
Mathematics and Statistics
Turbulent flow
Viscosity
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Summary: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.
ISSN:0965-5425
1555-6662
DOI:10.1134/S0965542519100129