Global Stability Analysis of Compressible Leading-Edge Flow on a Swept Wing

Christophe J. Mack (1) , Peter J. Schmid (1) , Jörn Sesterhenn (2)

1 LadHyX - Laboratoire d'hydrodynamique
2 Department of Numerical Mathematics

The global hydrodynamic stability of compressible leading-edge flow on a swept wing is addressed using Krylov-based iterative methods in conjunction with direct numerical simulations (DNS). Such a global hydrodynamic stability solver enables the analysis of complex fluid behavior by extracting global stability information directly from numerical simulations. Applying the DNS-based stability approach, unstable boundary-layer modes of the crossflow type and amplified as well as weakly-damped acoustic modes have been computed for a supersonic flow configuration. A parameter study reveals that, depending on the spanwise disturbance wavenumber β, boundary-layer modes or acoustic modes represent the dominant instability mechanism for the investigated parameter choices. Furthermore, the results of the present work clearly demonstrate the necessity of a global stability analysis to comprehensively understand the stability of swept leading-edge flow.

Domains: Physics [physics]; Mechanics [physics]; Fluid mechanics [physics.class-ph]; Engineering Sciences [physics]; Mechanics [physics.med-ph]; Fluids mechanics [physics.class-ph]

Christophe J. Mack, Peter J. Schmid, Jörn Sesterhenn. Global Stability Analysis of Compressible Leading-Edge Flow on a Swept Wing. 6th International Conference on Turbulence and Shear Flow Phenomena (TSFP-6), Jun 2009, Seoul, South Korea. pp.115-120. ⟨hal-01058601⟩