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Disturbance evolution in a mach 4.8 boundary layer with two-dimensional roughness-induced separation and shock

Marxen, O, Iaccarino, G and Shaqfeh, ESG (2010) Disturbance evolution in a mach 4.8 boundary layer with two-dimensional roughness-induced separation and shock Journal of Fluid Mechanics, 648. pp. 435-469.

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Abstract

A numerical investigation of the disturbance amplification in a Mach 4.8 flat-plate boundary layer with a localized two-dimensional roughness element is presented. The height of the roughness is varied and reaches up to approximately 70% of the boundary-layer thickness. Simulations are based on a time-accurate integration of the compressible Navier-Stokes equations, with a small disturbance of fixed frequency being triggered via blowing and suction upstream of the roughness element. The roughness element considerably alters the instability of the boundary layer, leading to increased amplification or damping of a modal wave depending on the frequency range. The roughness is also the source of an additional perturbation. Even though this additional mode is stable, the interaction with the unstable mode in the form of constructive and destructive interference behind the roughness element leads to a beating and therefore transiently increased disturbance amplitude. Far downstream of the roughness, the amplification rate of a flat-plate boundary layer is recovered. Overall, the two-dimensional roughness element behaves as disturbance amplifier with a limited bandwidth capable of filtering a range of frequencies and strongly amplifying only a selected range. © 2010 Cambridge University Press.

Item Type: Article
Authors :
NameEmailORCID
Marxen, Oo.marxen@surrey.ac.ukUNSPECIFIED
Iaccarino, GUNSPECIFIEDUNSPECIFIED
Shaqfeh, ESGUNSPECIFIEDUNSPECIFIED
Date : 10 April 2010
Identification Number : 10.1017/S0022112009992758
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:28
Last Modified : 17 May 2017 15:11
URI: http://epubs.surrey.ac.uk/id/eprint/839329

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