Seminar on Boundary layer modification with travelling surface waves generated by kagome lattices

15 Nov 2024 02.00 PM - 03.00 PM MAE Meeting Room B (Blk N3-02b-65) Current Students, Public

Prof Jonathan Morrison

Imperial College London, UK

This seminar will be chaired by A/P New Tze How, Daniel.

Seminar Abstract

Simulations and experiments have demonstrated that skin friction drag reductions of about 40% can be achieved by in-plane wall motion, such as that of spanwise oscillating walls or spanwise waves travelling in the streamwise direction. Systematic experiments have been performed to understand the fundamental mechanisms at high Reynolds numbers. Here we present a novel control surface based on the kagome lattice. The surface is able to generate spanwise travelling waves at different wavenumbers, amplitudes and frequencies over a wide range of nondimensional wave parameters. The work focuses on the development of simultaneous measurements of both the velocity flow field and of the surface deformation by combining Particle Image Velocimetry (PIV) with Digital Image Correlation (DIC). Initial results from two recent experiments are presented, the second in the Department’s 10x5 wind tunnel for Reτ ≤ 9000.

    Speaker's Biography 

    Professor Morrison has been Professor of Experimental Fluid Mechanics in the Department of Aeronautics, Imperial College, since 2005.  Recent experiments have particular relevance to the generation of drag, energy loss and emissions in fluid-based systems. The approach is multidisciplinary, using a novel blend of smart materials, modern control theory and fluid mechanics to control fluid flow to improve the efficiency of fluid-based systems, especially for the reduction of drag (and therefore emissions) in the transport sector. Research is both fundamental as well as application orientated, establishing technology platforms through collaboration with several international companies.  He is also a Royal Society Industry Fellow, collaborating with QinetiQ on “Drag reduction for new airframe design".  Notably, Professor Morison is the architect and founder of the National Wind Tunnel Facility. This innovative idea solved the problem of under-investment in UK wind tunnels by establishing an equitable, excellence-based framework for tunnel membership. With initial support of £13.3m from EPSRC and the Aerospace Technology Institute in 2014, the UK National Wind Tunnel Facility (NWTF) comprises 22 strategically important wind tunnels distributed across 12 universities. With further UKRI funding of £23m announced in June 2023,  a further 12 new facilities are being constructed with a new additional NWTF member.   He has been a Visiting Research Fellow at Princeton University (1999-2000; July-September 2001 & 2002), Fellow of the Royal Aeronautical Society and was elected to the Fellowship of the Royal Academy of Engineering in 2024.

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