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Direct numerical simulations of hypersonic boundary-layer transition with finite-rate chemistry

Marxen, O, Iaccarino, G and Magin, TE (2014) Direct numerical simulations of hypersonic boundary-layer transition with finite-rate chemistry Journal of Fluid Mechanics, 755. pp. 35-49.

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Abstract

The paper describes a numerical investigation of linear and nonlinear instability in high-speed boundary layers. Both a frozen gas and a finite-rate chemically reacting gas are considered. The weakly nonlinear instability in the presence of a large-amplitude two-dimensional wave is investigated for the case of fundamental resonance. Depending on the amplitude of this two-dimensional primary wave, strong growth of oblique secondary perturbations occurs for favourable relative phase differences between the two. For essentially the same primary amplitude, secondary amplification is almost identical for a reacting and a frozen gas. Therefore, chemical reactions do not directly affect the growth of secondary perturbations, but only indirectly through the change of linear instability and hence amplitude of the primary wave. When the secondary disturbances reach a sufficiently large amplitude, strongly nonlinear effects stabilize both primary and secondary perturbations. © Cambridge University Press 2014.

Item Type: Article
Authors :
NameEmailORCID
Marxen, Oo.marxen@surrey.ac.ukUNSPECIFIED
Iaccarino, GUNSPECIFIEDUNSPECIFIED
Magin, TEUNSPECIFIEDUNSPECIFIED
Date : 1 January 2014
Identification Number : https://doi.org/10.1017/jfm.2014.344
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/839320

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