Instabilities of Transonic Turbulent Flow over a Flat-Sided Wedge

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Kuzmin a.

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Journal Paper

Paper Information

Journal: JOURNAL OF APPLIED FLUID MECHANICS (JAFM) Year:2023 | Volume:16 | Issue:1 Page(s): 1-7

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Information Journal Paper

Title

Instabilities of Transonic Turbulent Flow over a Flat-Sided Wedge

Author(s)

Kuzmin a. | Issue Writer Certificate

Keywords

Local supersonic regions

Shock waves

Interaction

Boundary-layer separation

Oscillations

Abstract

The transonic turbulent two-dimensional airflow over a symmetric flat-sided double wedge is studied numerically. Solutions of the Reynolds-averaged Navier-Stokes equations are obtained with ANSYS-18. 2 CFX finite-volume solver of second order accuracy on a fine mesh. The solutions demonstrate an extreme sensitivity of the flow field and lift coefficient to variation of the angle of attack α or free-stream Mach number M∞. Non-unique flow regimes and hysteresis in certain bands of α and M∞ are identified. Interaction of Shock waves and Local supersonic regions is discussed. The study confirms a concept of shock wave instability due to a coalescence/rupture of supersonic regions. In addition to the instability of shock wave locations, the numerical simulation shows a buffet onset, i. e., self-exciting Oscillations due to instability of a boundary layer separation at the rear of wedge. Curious flow regimes with positive lift at negative angles α and, vice versa, with negative lift at positive angles α, are pointed out. A piecewise continuous dependence of the lift coefficient on two free-stream parameters, α and M∞, is discussed.

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