BiGlobal stability analysis of the wake behind an isolated roughness element in hypersonic flow. (January 2020)

• Record Type: Journal Article
• Authors: Montero, Iván Padilla; Pinna, Fabio
• Other Names: Knight Doyle D guest-editor.; Lipatov Igor guest-editor.
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 234:Number 1(2020)
• Page Start: 5
• Page End: 19
• Publication Date: 2020-01
• Subjects: Boundary layer -- stability -- transition -- hypersonic -- BiGlobal -- roughness; Aeronautics -- Periodicals; Astronautics -- Periodicals; Airplanes -- Design and construction -- Periodicals; Aerospace industries -- Periodicals; 629.1
• DOI: 10.1177/0954410019832733
• Languages: English
• ISSNs: 0954-4100

Abstract

Numerical results are presented for the stability analysis of the wake induced by a cuboidal roughness element mounted on a flat plate inside a Mach 6 freestream. Linear BiGlobal stability calculations are carried out for a single frequency on a spanwise plane located behind the roughness, using base flows obtained from laminar Navier–Stokes simulations. The results show that the Mack mode is the most unstable perturbation growing in the boundary layer, followed by varicose and sinuous deformations of the low-velocity streak that characterizes the wake flow structure. The shock wave induced at the leading edge of the flat plate is found to have a significant stabilizing effect on the flow field. The use of a higher wall temperature stabilizes the Mack mode but increases the growth rate of the varicose perturbation.