ABSOLUTE INSTABILITY OF COMPRESSIBLE THREE-DIMENSIONAL FLOW

Abstract

In the present paper the instability character (absolute/convective) of compressible viscous flow around geometries rotating in uniform flow is analysed. The linear local stability theory is used to investigate the boundary layer stability. Following the works of Briggs and Bers in the field of plasma physics, the absolute instability region is identified by singularities of dispersion relation called pinch — points. Calculations have been made for different Mach numbers and wall temperatures.

Keywords

• numerical simulations
• compressible flow
• instabilities
• absolute instability