Strong interaction of a turbulent spot with a shock-induced separation bubble
Strong interaction of a turbulent spot with a shock-induced separation bubble
Direct numerical simulations have been conducted to study the passage of a turbulent spot through a shock-induced separation bubble. Localized blowing is used to trip the boundary layer well upstream of the shock impingement, leading to mature turbulent spots at impingement, with a length comparable to the length of the separation zone. Interactions are simulated at free stream Mach numbers of two and four, for isothermal (hot) wall boundary conditions. The core of the spot is seen to tunnel through the separation bubble, leading to a transient reattachment of the flow. Recovery times are long due to the influence of the calmed region behind the spot. The propagation speed of the trailing interface of the spot decreases during the interaction and a substantial increase in the lateral spreading of the spot was observed. A conceptual model based on the growth of the lateral shear layer near the wingtips of the spot is used to explain the change in lateral growth rate
016102-[11pp]
Krishnan, L.
4eb5cfc3-d3e2-474d-a63b-e1f80de54bf6
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
January 2007
Krishnan, L.
4eb5cfc3-d3e2-474d-a63b-e1f80de54bf6
Sandham, N.D.
0024d8cd-c788-4811-a470-57934fbdcf97
Krishnan, L. and Sandham, N.D.
(2007)
Strong interaction of a turbulent spot with a shock-induced separation bubble.
Physics of Fluids, 19 (1), .
(doi:10.1063/1.2432158).
Abstract
Direct numerical simulations have been conducted to study the passage of a turbulent spot through a shock-induced separation bubble. Localized blowing is used to trip the boundary layer well upstream of the shock impingement, leading to mature turbulent spots at impingement, with a length comparable to the length of the separation zone. Interactions are simulated at free stream Mach numbers of two and four, for isothermal (hot) wall boundary conditions. The core of the spot is seen to tunnel through the separation bubble, leading to a transient reattachment of the flow. Recovery times are long due to the influence of the calmed region behind the spot. The propagation speed of the trailing interface of the spot decreases during the interaction and a substantial increase in the lateral spreading of the spot was observed. A conceptual model based on the growth of the lateral shear layer near the wingtips of the spot is used to explain the change in lateral growth rate
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Published date: January 2007
Additional Information:
16102
Organisations:
Aerodynamics & Flight Mechanics
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Local EPrints ID: 45721
URI: http://eprints.soton.ac.uk/id/eprint/45721
ISSN: 1070-6631
PURE UUID: 5a03cc2b-2da9-49a5-bf1d-7913d3dd106e
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Date deposited: 02 Apr 2007
Last modified: 16 Mar 2024 03:03
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Author:
L. Krishnan
Author:
N.D. Sandham
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