Scale interactions in wall turbulence: Old challenges tackled with new perspectives
Lead Research Organisation:
University of Southampton
Department Name: Faculty of Engineering & the Environment
Abstract
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Publications
Dogan E
(2017)
Modelling high Reynolds number wall-turbulence interactions in laboratory experiments using large-scale free-stream turbulence.
in Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
Elsinga G
(2013)
Advances in 3D velocimetry
in Measurement Science and Technology
Ganapathisubramani B
(2012)
Amplitude and frequency modulation in wall turbulence
in Journal of Fluid Mechanics
Hanson R
(2016)
Development of turbulent boundary layers past a step change in wall roughness
in Journal of Fluid Mechanics
Hearst R
(2015)
Quantification and adjustment of pixel-locking in particle image velocimetry
in Experiments in Fluids
Placidi M
(2015)
Effects of frontal and plan solidities on aerodynamic parameters and the roughness sublayer in turbulent boundary layers
in Journal of Fluid Mechanics
Taddei S
(2016)
Characterisation of drag and wake properties of canopy patches immersed in turbulent boundary layers
in Journal of Fluid Mechanics
Vanderwel C
(2015)
Effects of spanwise spacing on large-scale secondary flows in rough-wall turbulent boundary layers
in Journal of Fluid Mechanics
| Description | In this project, we attempted to understand the impact of changes in boundary conditions on the nature of turbulent flows. This will enable us to develop new ways to control flows and improve the efficiency of flow systems. We developed a new way of examining the flow where the the surface of the flow goes from rough to smooth. This has a wide variety of practical applications where regions of wing surfaces or pipes have areas that are rough and those that are smooth. Understanding how the flow over these areas interact with each other will allow us to predict the power consumption in these systems. |
| Exploitation Route | We have carried out extensive measurements of turbulent flows that flow from a rough surface on to a smooth surface. We analysed the data and we have an extensive database for this type of flow. This database (which is now published) will allows modellers and computational experts to use the data to develop new models to predict drag and power consumption of such flows and also for validation of their methods. In fact, this has already started happening with researchers from around the world are downloading this data (It has been downloaded from our website 8 times). A new worldwide special interest group was setup under the auspices of NATO to examine scale interactions and its effect of non-equilibrium flows. I could not participate in this because I am not a citizen of a NATO country. |
| Sectors | Aerospace, Defence and Marine,Energy,Transport |
| Description | The findings from this project will be used to develop new models to predict the behaviour of flows over surfaces that some regions that are smooth and other regions that are rough. These type of surfaces are abundant in nature as well as in engineering applications. |
| First Year Of Impact | 2014 |
| Sector | Aerospace, Defence and Marine,Energy,Transport |
| Description | Collaboration with Melbourne |
| Organisation | University of Melbourne |
| Country | Australia |
| Sector | Academic/University |
| PI Contribution | We carried out collaborative experiments at Southampton of flows over smooth and rough surfaces. The rough surfaces were manufactured in Melbourne and shipped to Southampton for the measurements. |
| Collaborator Contribution | The collaborators allowed access to their unique wind tunnel facility as well as provided the rough surfaces for measurements in Southampton. |
| Impact | We have published 2 papers as a result of the collaboration with Melbourne. We are currently working on further publications. |
| Start Year | 2009 |
| Description | Collaboration with Princeton |
| Organisation | Princeton University |
| Country | United States |
| Sector | Academic/University |
| PI Contribution | I spent 6 months on a sabbatical at Princeton working with students to develop a new experiment as well as in data analysis. The fact that I got access to the utilise the superpipe facility (A unique facility) at Princeton is critical. |
| Collaborator Contribution | The partners at Princeton provided a host institution for my sabbatical as well as provided the human and infrastructure resources to carry out state-of-the-art research in the area of turbulent flows. |
| Impact | We are currently working on publications that is came out of the work that was carried out when I was in Princeton. |
| Start Year | 2013 |