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On the merging of turbulent spots in a supersonic boundary-layer flow

On the merging of turbulent spots in a supersonic boundary-layer flow
On the merging of turbulent spots in a supersonic boundary-layer flow
The complex transition flow physics associated with the merging of turbulent spots in a Mach 2 boundary-layer has been studied using direct numerical simulation. Dynamics of an isolated turbulent spot, merging of laterally displaced spots, and merging of two spots in tandem are considered. The coherent structures associated with the wingtip region of the spot are found to play a major role in destabilising the surrounding laminar fluid. In the merging of laterally displaced spots a strong velocity defect, resulting in unstable inflectional velocity profiles, is observed in the interaction zone. These local inflectional instabilities within the interaction region trigger new large scale coherent structures. During the inline merging, the calmed region behind the tail of the downstream spot is found to suppress the growth of the upstream spot. The upstream spot is ultimately engulfed by the downstream spot.
turbulent spots, transition to turbulence, compressible boundary layer, spot merging
0142-727X
542-550
Krishnan, L.
4eb5cfc3-d3e2-474d-a63b-e1f80de54bf6
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Krishnan, L.
4eb5cfc3-d3e2-474d-a63b-e1f80de54bf6
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97

Krishnan, L. and Sandham, N.D. (2006) On the merging of turbulent spots in a supersonic boundary-layer flow. International Journal of Heat and Fluid Flow, 27 (4), 542-550. (doi:10.1016/j.ijheatfluidflow.2006.02.002).

Record type: Article

Abstract

The complex transition flow physics associated with the merging of turbulent spots in a Mach 2 boundary-layer has been studied using direct numerical simulation. Dynamics of an isolated turbulent spot, merging of laterally displaced spots, and merging of two spots in tandem are considered. The coherent structures associated with the wingtip region of the spot are found to play a major role in destabilising the surrounding laminar fluid. In the merging of laterally displaced spots a strong velocity defect, resulting in unstable inflectional velocity profiles, is observed in the interaction zone. These local inflectional instabilities within the interaction region trigger new large scale coherent structures. During the inline merging, the calmed region behind the tail of the downstream spot is found to suppress the growth of the upstream spot. The upstream spot is ultimately engulfed by the downstream spot.

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More information

Published date: 2006
Keywords: turbulent spots, transition to turbulence, compressible boundary layer, spot merging
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 43017
URI: http://eprints.soton.ac.uk/id/eprint/43017
ISSN: 0142-727X
PURE UUID: e63be4c2-a759-4c59-8579-a144d863883a
ORCID for N.D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

Catalogue record

Date deposited: 08 Jan 2007
Last modified: 16 Mar 2024 03:03

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Contributors

Author: L. Krishnan
Author: N.D. Sandham ORCID iD

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