AIM (Advanced Instability Methods) for industry
Lead Research Organisation:
Imperial College London
Department Name: Aeronautics
Abstract
Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
People |
ORCID iD |
| Spencer Sherwin (Principal Investigator) | |
| Tamer Zaki (Co-Investigator) |
Publications
Blackburn H
(2013)
Lower branch equilibria in Couette flow: the emergence of canonical states for arbitrary shear flows
in Journal of Fluid Mechanics
Bolis A
(2014)
From h to p efficiently: optimal implementation strategies for explicit time-dependent problems using the spectral/ hp element method
in International Journal for Numerical Methods in Fluids
Cantwell C
(2015)
Nektar++: An open-source spectral/ h p element framework
in Computer Physics Communications
Cheung L
(2010)
Linear and nonlinear instability waves in spatially developing two-phase mixing layers
in Physics of Fluids
Foures D
(2014)
Optimal mixing in two-dimensional plane Poiseuille flow at finite Péclet number
in Journal of Fluid Mechanics
Foures D
(2013)
Localization of flow structures using -norm optimization
in Journal of Fluid Mechanics
Foures DP
(2012)
Variational framework for flow optimization using seminorm constraints.
in Physical review. E, Statistical, nonlinear, and soft matter physics
Illingworth S
(2013)
Finding thermoacoustic limit cycles for a ducted Burke-Schumann flame
in Proceedings of the Combustion Institute
Illingworth, S
(2014)
Acoustic state space models using a wave-based approach
in 21st International Conference on Sound and Vibration
Juniper M
(2011)
The local and global stability of confined planar wakes at intermediate Reynolds number
in Journal of Fluid Mechanics
| Description | We have transferred developments in non-modal stability analysis from the applied maths community to the engineering community. These techniques span a large class of engineering problems. In combustion instability, one of the application areas of the research, we have checked the results experimentally and see how to embed the process within the design cycle. This will be done in future research projects. One objective of the grant was to enable the UK to become the centre for the engineering application of non-modal stability analysis. There were many publications and conference presentations that arose from this project, as intended. Even better for this objective, one of the main architects of the application of this analysis to fluid mechanics, who was a partner on the proposal, moved from overseas to the UK during the grant. Regarding the technical objectives, we successfully developed and tested the generalized framework for non-modal stability analysis and applied it to the two situations envisaged. We have developed stability analysis methods for complex geometry flows which are now available in an open access software package, Nektar++. Not only have we provided methods to analyse two dimensional (biglobal) geometries using classical eigenvalue analysis as well as singular value decomposition we have also extended these techniques to so called Triglobal problems where one can analyse the instability pas a three-dimensional flow. Using triglobal analysis we have investigated how spanwise blowing and sucking can suppress vortex shedding of flow past a circular cylinder. Whilst the analysis is at low Reynolds numbers the instability persist to higher Reynolds numbers and so has potential broader application. We have developed a mathematically rigorous method to determine the best way to mix fluids with different properties with a fixed amount of energy input. This method can be applied to a wide range of engineering problems, in a range of flow geometries. Now that we have developed the DAL method for mixing problems, it can be applied to a wide range of situations. Possible future directions include optimising mixing in fluids with non-newtonian rheologies, flows in complicated geometries, or reacting flows, where the mixing also has a dynamical effect. |
| Exploitation Route | We continue to get request about the usage of the stability tools within this package. It has also been used as part of an European training network where we have extended the technique to fully 3D (Triglobal) methods. The package continues to be used in related grant within our own group. There are now publication in the leading Journal of Fluid Mechanics using our tools by groups in Poland (Stan Gepner) and Australiia (Liang Cheng) |
| Sectors | Aerospace Defence and Marine Healthcare |
| URL | http://www.nektar.info |
| Description | Council of Science and Technology Review on Modelling |
| Geographic Reach | National |
| Policy Influence Type | Membership of a guideline committee |
| Description | EC: IDIHOM |
| Amount | £196,452 (GBP) |
| Funding ID | 265780 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 06/2010 |
| End | 06/2013 |
| Description | EU European Training Network:SSeMID |
| Amount | £220,000 (GBP) |
| Funding ID | 675008 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 01/2016 |
| End | 01/2020 |
| Description | EU Research Training Network: ANADE |
| Amount | £440,515 (GBP) |
| Funding ID | 289428 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 12/2012 |
| End | 11/2016 |
| Description | McLaren Group PhD funding |
| Amount | £174,400 (GBP) |
| Organisation | McLaren Group |
| Sector | Private |
| Country | United Kingdom |
| Start | 12/2007 |
| End | 11/2011 |
| Description | RAEng/McLaren Research Chair |
| Amount | £200,000 (GBP) |
| Organisation | Royal Academy of Engineering |
| Sector | Charity/Non Profit |
| Country | United Kingdom |
| Start | 09/2012 |
| End | 09/2017 |
| Description | McLaren Racing |
| Organisation | McLaren Racing |
| Country | United Kingdom |
| Sector | Private |
| PI Contribution | We have transferred fundamental ideas behind vortex stability and identification to their design practice. More recently we are been applying computational modelling tools developed in an academic setting to example flow problems of direct interest to McLaren. |
| Collaborator Contribution | Data and motivation on how to focus our research direction |
| Impact | . |
| Start Year | 2007 |
| Title | Nektar++ version 4.0.1 |
| Description | Nektar++ is a tensor product based finite element package designed to allow one to construct efficient classical low polynomial order h-type solvers (where h is the size of the finite element) as well as higher p-order piecewise polynomial order solvers. |
| Type Of Technology | Software |
| Year Produced | 2014 |
| Open Source License? | Yes |
| Impact | The software is being used by a number of national and international groups and our web site is currently being visited up to 100 times a day according to google analytics |
| URL | http://www.nektar.info/downloads/file/nektar-source-tar-gz-2/ |