Turbulent spots in a compressible boundary layer flow
Turbulent spots in a compressible boundary layer flow
Direct simulation of an isolated turbulent spot in a compressible isothermal wall boundary-layer flow has been performed. A bypass transition scenario at Mach 2,4 and 6 is considered. The flow field associated with the transitional and turbulent spots is studied in detail, with results in broad agreement with previous experimental work. The evolved spots are found to have an arrowhead shaped front with a leading edge overhang, followed by a turbulent core and a calmed region at the rear interface. The lateral spreading of the spot is found to decrease substantially with the flow. Evidence for a supersonic (Mack) mode is found in the Mach 6 case: spanwise-coherent structures are observed under the spot overhang region.
9781402034596
329-334
Krishnan, L.
0024d8cd-c788-4811-a470-57934fbdcf97
2006
Krishnan, L.
0024d8cd-c788-4811-a470-57934fbdcf97
Krishnan, L.
(2006)
Turbulent spots in a compressible boundary layer flow.
Govindarajan, Rama
(ed.)
In IUTAM Symposium on Laminar-Turbulent Transition.
vol. 78,
Springer.
.
(doi:10.1007/1-4020-4159-4_46).
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Conference or Workshop Item
(Paper)
Abstract
Direct simulation of an isolated turbulent spot in a compressible isothermal wall boundary-layer flow has been performed. A bypass transition scenario at Mach 2,4 and 6 is considered. The flow field associated with the transitional and turbulent spots is studied in detail, with results in broad agreement with previous experimental work. The evolved spots are found to have an arrowhead shaped front with a leading edge overhang, followed by a turbulent core and a calmed region at the rear interface. The lateral spreading of the spot is found to decrease substantially with the flow. Evidence for a supersonic (Mack) mode is found in the Mach 6 case: spanwise-coherent structures are observed under the spot overhang region.
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Published date: 2006
Venue - Dates:
IUTAM Symposium on Laminar-Turbulent Transition, Bangalore, India, 2004-12-13 - 2004-12-17
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Local EPrints ID: 22973
URI: http://eprints.soton.ac.uk/id/eprint/22973
ISBN: 9781402034596
PURE UUID: 92ffbddf-b55d-400c-9e3a-4c2880c3901a
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Date deposited: 05 Feb 2007
Last modified: 16 Mar 2024 03:03
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Author:
L. Krishnan
Editor:
Rama Govindarajan
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