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Effect of a 3d surface indentation on boundary layer stability

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Title: Effect of a 3d surface indentation on boundary layer stability
Authors: Xu, H
Mughal, MS
Gowree, ER
Sherwin, S
Item Type: Conference Paper
Abstract: We are concerned about effect of a 3D surface indentation on instability and laminar-turbulent transition in a boundary layer. For natural transition in a boundary layer, the transition onset is dominated by growth of the Tollmien- Schlichting (TS) wave and its subsequent secondary instability. In the paper, both linear analysis and nonlinear calculations are carried out to address the 3D surface indentation effect on amplifying TS waves’ amplitudes and prompting transition onset. By the linear analysis, we address sudden amplification of the TS modes by a separation bubble in a surface indentation region. The nonlinear calculations are implemented to validate the traditional transition criteria predicted by the linear theory when a 3D indentation is present. Finally, applicability of the traditional transition criteria is assessed.
Issue Date: 21-Aug-2016
Date of Acceptance: 15-Apr-2016
URI: http://hdl.handle.net/10044/1/45369
Publisher: ICAS
Journal / Book Title: ICAS proceedings
Copyright Statement: © 2016 The Authors
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Royal Academy Of Engineering
Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/H000208/1
Conference Name: 24th International Congress of Theoretical and Applied Mechanics ICTAM 2016
Publication Status: Published
Start Date: 2016-08-21
Finish Date: 2016-08-26
Conference Place: Montreal, Canada
Open Access location: https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiT_svA1MXTAhUlC8AKHSxGDYAQFggtMAA&url=https://www.eiseverywhere.com/retrieveupload.php?c3VibWlzc2lvbl8xMzEzNzJfNzQzODIyLnBkZiplc2VsZWN0&usg=AFQjCNEga2Hq-MMf61jobIFo24GwjZXCog
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences
Faculty of Engineering