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TRIMIS

Manipulation of Reynolds Stress for Separation Control and Drag Reduction

PROJECTS
Funding
European
European Union
Duration
-
Status
Complete with results
Geo-spatial type
Other
Total project cost
€3 490 633
EU Contribution
€1 498 673
Project website
Project Acronym
MARS
STRIA Roadmaps
Vehicle design and manufacturing (VDM)
Transport mode
Airborne icon
Transport policies
Societal/Economic issues
Transport sectors
Passenger transport,
Freight transport

Overview

Call for proposal
FP7-AAT-2010-RTD-CHINA
Link to CORDIS
Background & Policy context

Reynolds stress is the most important quantity affecting the mean flow as it is responsible for a major part of the momentum transfer in the wall bounded turbulent flow. It has a direct relevance to both skin friction and flow separation. Manipulation of the Reynolds stress can directly lead to changes in the viscous stress at the wall so as to effectively control the flow for effective flow control. However, there is a lack of current understanding of the inter-relationship between the various flow control devices and the Reynolds stresses in the flow field they produced.

Objectives

An improved understanding can potentially significantly improve the effectiveness of flow control as the Reynolds stresses are closely related to the flow behaviour at the surface for effective separation control or drag reduction.

A variety of control devices are available and new ones are invented, but which one for what purpose is an open question yet to be fully answered. The MARS project proposes to reverse that process and considers the long term goal of controlling dynamic structures that influence the Reynolds stress that changes the mean flow. This radical approach recognises we are still some way away from hardware to implement it at flight scales but if successful, would establish a first important step towards our ultimate ambition.

Methodology

The focus of MARS will be on the effects of a number of active flow control devices on the discrete dynamic components of the turbulent shear layers and the Reynolds stress. From the application point of view, MARS provides a positive and necessary step in the right direction wherein it will demonstrate the capability to control individual structures that are larger in scale and lower in frequency compared to the richness of the time and spatial scales in a turbulent boundary layer. MARS will investigate active flow control means rather than passive controls.

Funding

Parent Programmes
Institution Type
Public institution
Institution Name
The European Commission
Type of funding
Public (EU)
Specific funding programme
FP7-TRANSPORT

Results

Turbulence suppression by active control

Numerical experiments have reached a maturity allowing EU-funded scientists to confirm wind tunnel measurements of active flow control devices. They proved that efficient manipulation of natural instability phenomena can improve the aerodynamic performance of aircraft.

Airflow around aircraft is described mathematically by three components consisting of a mean flow, a dynamic but periodic component, and a random turbulence component for which Reynolds stresses are defined. The majority of work on 'taming' turbulence with the aim of reducing skin friction has focused on changes in the mean flow that result in changes to Reynolds stresses.

Chinese and European researchers initiated the EU-funded project 'Manipulation of Reynolds stress for separation control and drag reduction' (http://www.cimne.com/mars/ (MARS)) to examine the problem differently. They concentrated on the effects of active flow control on the periodic component. This radically new approach allowed them to demonstrate the ability to control individual dynamic structures larger in scale and lower in frequency than in the turbulent shear layer.

The performance of control devices such as plasma actuators and oscillating surfaces on dynamic structures that influence Reynolds stress was explored in wind tunnel set-ups. Detached eddy simulation and Reynolds-averaged Navier–Stokes models also provided insights into critical flow parameters. Experimental investigations and numerical simulations complemented each other for extracting flow details.

Under certain conditions, unsteady flows were achieved, and the influence of the periodic component on turbulence Reynolds stresses was investigated. The findings offered MARS researchers a better understanding of the effects of flow control on turbulence Reynolds stress. These are responsible for a major part of momentum transfer in wall-bounded turbulent flows and hold the key to skin friction.

In addition, MARS researchers identified candidate devices for further development to effectively reduce skin friction and thereby drag opposing the aircraft's motion under real flight conditions. The next generation of active airflow control devices could ensure more efficient air transportation with fewer emissions of harmful gases into the environment.

Partners

Lead Organisation
Organisation
Centre Internacional De Metodes Numerics En Enginyeria
Address
C Gran Capitan, Edifici C1, Campus Nord Upc Sn, 8034 Barcelona, Spain
Organisation website
EU Contribution
€219 383
Partner Organisations
Organisation
Institut National De Recherche En Informatique Et Automatique
Address
Domaine de Voluceau- Rocquencourt, B.P. 105 LE CHESNAY, France
Organisation website
EU Contribution
€110 271
Organisation
Totalforsvarets Forskningsinstitut
Address
Gullfossgatan, 164 90 Stockholm, Sweden
Organisation website
EU Contribution
€159 161
Organisation
Manchester Metropolitan University
Address
All Saints Building, Oxford Road, MANCHESTER, M15 6BH, United Kingdom
Organisation website
EU Contribution
€177 300
Organisation
The University Of Sheffield
Address
Firth Court Western Bank, Sheffield, S10 2TN, United Kingdom
Organisation website
EU Contribution
€239 231
Organisation
Chinese Aeronautical Establishment
Address
N°2, Anwai Beiyuan, Chaoyang District, Beijing, 100012, China
EU Contribution
€29 465
Organisation
Tsinghua University
Address
Qing Hua Yuan, Beijing, 100084, China
EU Contribution
€6 240
Organisation
Zhejiang University
Address
Zhe Da Road 38, Hangzhou, 310027, China
Organisation website
EU Contribution
€1 500 000
Organisation
Zhejiang University
Address
Zhe Da Road 38, Hangzhou, 310027, China
Organisation website
EU Contribution
€5 772
Organisation
Deutsches Zentrum Fr Luft Und Raumfahrt E.v
Address
Linder Hoehe, 51147 KOELN, Germany
Organisation website
EU Contribution
€4 969 975
Organisation
Deutsches Zentrum Fr Luft Und Raumfahrt E.v
Address
Linder Hoehe, 51147 KOELN, Germany
Organisation website
EU Contribution
€113 682
Organisation
Airbus Espana, S.l. Sociedad Unipersonal
Address
P John Lenon, s/n, 28906 GETAFE, Spain
Organisation website
EU Contribution
€7 999 303
Organisation
Airbus Espana, S.l. Sociedad Unipersonal
Address
P John Lenon, s/n, 28906 GETAFE, Spain
Organisation website
EU Contribution
€47 695
Organisation
Dassault Aviation
Address
9, Rond-Point des Champs-Elysées - Marcel Dassault, 75008 PARIS, France
Organisation website
EU Contribution
€6 996 196
Organisation
Dassault Aviation
Address
9, Rond-Point des Champs-Elysées - Marcel Dassault, 75008 PARIS, France
Organisation website
EU Contribution
€23 850
Organisation
Alenia Aermacchi Spa
Address
Viale Dell'aeronautica Snc, 80038 Pomigliano D'arco (Na), Italy
Organisation website
EU Contribution
€17 799 956
Organisation
Alenia Aermacchi Spa
Address
Viale Dell'aeronautica Snc, 80038 Pomigliano D'arco (Na), Italy
Organisation website
EU Contribution
€49 287
Organisation
Nanjing University Of Aeronautics And Astronautics
Address
Yudao Street 29, Nanjing, 210016, China
EU Contribution
€13 911
Organisation
Numerical Mechanics Application International
Address
5 Avenue Franklin Roosevelt, 1050 BRUSSELS, Belgium
Organisation website
EU Contribution
€95 153
Organisation
Northwestern Polytechnical University
Address
Youyi Xilu 127, Xi An, 710072, China
EU Contribution
€6 600
Organisation
Airbus Defence And Space Ltd
Address
Gunnels Wood Road, STEVENAGE, SG1 2AS, United Kingdom
Organisation website
EU Contribution
€2 180 792
Organisation
Airbus Defence And Space Ltd
Address
Gunnels Wood Road, STEVENAGE, SG1 2AS, United Kingdom
Organisation website
EU Contribution
€14 167
Organisation
Beihang University
Address
Xue Yuan Road 37, Beijing, 100083, China
Organisation website
EU Contribution
€4 478
Organisation
Centre National De La Recherche Scientifique
Address
3 rue Michel-Ange, 75794 PARIS, France
Organisation website
EU Contribution
€180 552
Organisation
Peking University
Address
The Summer Palace Road 5, Beijing, 100871, China
Organisation website
EU Contribution
€2 475

Technologies

Technology Theme
Aircraft design and manufacturing
Technology
Active flow control and interrelations with Reynolds stress
Development phase
Research/Invention

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