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STAR SIGNED

An Extended Local Scattering Theory for Acoustic-radiation and Receptivity of Trailing-edge Flows

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EC-Contrib. €

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Project "STAR" data sheet

The following table provides information about the project.

Coordinator
IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE 

Organization address
address: SOUTH KENSINGTON CAMPUS EXHIBITION ROAD
city: LONDON
postcode: SW7 2AZ
website: http://www.imperial.ac.uk/

contact info
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surname: n.a.
function: n.a.
email: n.a.
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 Coordinator Country United Kingdom [UK]
 Project website http://www.imperial.ac.uk/mathematics/
 Total cost 195˙454 €
 EC max contribution 195˙454 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2014
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2016
 Duration (year-month-day) from 2016-01-31   to  2018-01-30

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE UK (LONDON) coordinator 195˙454.00

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 Project objective

Trailing-edge flows arise in many technological applications, such as aircraft wings in aeronautics and mixing devices in chemical engineering. Two important and fundamental processes take place near the trailing edge, namely the acoustic radiation and receptivity, which refer to generation of sound by fluctuations within the flows and excitations of instability waves by ambient disturbances, respectively. This project will investigate (a) generation of instability waves in the wake as free-stream acoustic and vortical disturbances impinge on the trailing edge; (b) radiation of sound when Tollmien-Schlichting (T-S) waves in the upstream boundary layer propagate through and interact with the trailing-edge flow. Both processes will be analysed mathematically by developing a Local Scattering Theory, which we recently proposed as an appropriate framework for describing the coupling of distinct characteristic motions in a region of strong inhomogenuity. Furthermore, with radiation and receptivity being described properly, we will move on to investigate the so-called acoustic feedback loops, in which instability waves and acoustic waves are generated from each other, leading to self-sustained oscillations. First-principle theories will be developed to predict the intensities as well as the tones (frequencies) of the oscillations. As receptivity, acoustic radiation and acoustic feedback loops are fundamental processes closely related to drag on the wing, jet and airframe noise and mixing of reactants, the present project is of high practical relevance. From the methodology point of view, this project will combine sophisticated asymptotic methods with highly accurate numerical computations, enabling us to tackle a greater range of complex problems, for which numerical or analytical method alone would be inadequate.

 Publications

year authors and title journal last update
List of publications.
2018 Ming Dong, Xuesong Wu
Generation of symmetric instability modes in the wake behind the trailing edge of a flat plate. Part 2. Transmission of Tollmien-Schlitching wave
published pages: , ISSN: 0022-1120, DOI:
Journal of Fluid Mechanics In preparing 2019-06-18
2018 Ming Dong, Xuesong Wu
Generation of symmetric instability modes in the wake flow behind the trailing edge of a flat plate. Part 1: receptivity to free-stream sound wave
published pages: , ISSN: 0022-1120, DOI:
Journal Fluid Mechanics Submitted 2019-06-18

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