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Publication List
Publications in Journals
1. K. B. Lua, T. T. Lim, K.S. Yeo and G.Y. Oo. Wake-structure Formation of a Heaving Two-dimensional Elliptic Airfoil. AIAA Journal, Vol. 45, No. 7, July 2007, pp. 1571-1583.
2. K. B. Lua, T. T. Lim and K.S. Yeo. Aerodynamic Forces and Flow Fields of a Two-dimensional Hovering Wing. Experiments in Fluids, Vol. 45, No. 6, Dec 2008, pp. 1047-1065.
3. T. T. Lim, C. J. Teo, K. B. Lua and K. S. Yeo. On the Issue of the Stability of Leading Edge Vortex on A Flapping Wing. Modern Physics Letters B, Vol. 23, No. 3, Jan 2009, pp. 357-360.
Publications in Conference Proceedings
1. T. L. Chng, T. T. Lim, J. Soria, K. B. Lua and K. S. Yeo. Flow Past an Oscillating Bi-Convex Aerofoil. Symposium on Turbulence and Shear Flow Phenomena, 24th-27th June 2003.
2. T. L. Chng, T. T. Lim, J. Soria, K. B. Lua and K. S. Yeo. Flow Past an Impulsively Started Oscillating Elliptical Cylinder. 15th Australasian Fluid Mechanics Conference, December 2004, AFMC00222.
3. G. Y. Oo, K. B. Lua, K. S. Yeo and T. T. Lim. Wake Structures of a Heaving Airfoil. 15th Australasian Fluid Mechanics Conference, December 2004, AFMC00223.
4. K. B. Lua, T. T. Lim, K. S. Yeo and G. Y. Oo. A Study of Wake Structures of A Heaving Two-dimensional Elliptic Airfoil Using DPIV Technique. 45th AIAA Aerospace Sciences Meeting and Exhibit, January 2007, AIAA-2007-0276.
5. T. T. Lim, C. J. Teo, K. B. Lua and K. S. Yeo. On the Issue of the Stability of Leading Edge Vortex on A Flapping Wing. The Second International Symposium on Physics of Fluids (ISPF2), 9-12 June, 2008, Nanjing, China.
6. K. B. Lua, T. T. Lim and K. S. Yeo. On the effects of advanced and delayed pitching on a 2-D hovering wing. 12ACFM (The Twelfth Asian Congress of Fluid Mechanics), August 18-21, 2008, Daejeon, Korea.
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Simulated insect wing motion |
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Both sequences were obtained using Particle Image Velocimetry, ultilising a pulsed laser. |
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Research Group |
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The first insects took to the air more than 300 million years ago (i.e., according to paleontologists), long before the first bird-like creatures, the pterosaurs (flying dinosaurs), appeared on the scene some 100 million years later. Evolution has endowed insects with a mastery of air unmatched by any other groups of living beings. As a step towards gaining understanding the intricacies of insect flight, an experimental research project is recently conducted in the ME department. The objective of this project is to establish essential engineering data and to gain basic understanding on the complex fluids dynamics of flapping flight. For this purpose, a 3-D flapping mechanism and a 2-D oscillating mechanism have been fabricated to allow aerodynamic force measurements on a pair of 3-D flapping wings and PIV measurements on the unsteady flow around a 2-D hovering wing. The experimental models are able to reproduce, via computer control, the complex wing motions of insects. Besides answering to the idle curiosity in some of us (what some might call the science), there is also a technological dimension to the problem; that of re-creating in the longer-term the mechanical insect flyers, just as humans had first created the planes in emulation of the birds. It could be the next generation of toys for some and spyware for others. |
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(a) |
Sweeping only |
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(b) |
Elevation only |
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(c) |
Rotation only |
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Combination of motion in (a), (b) and (C) |
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(a) |
Hawk moth hovering motion in action: |
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(b) |
Figure-of-eight hovering motion in action: |
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(a) |
Flowfield of an oscillating wing subjected to an accelerated motion: |
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(b) |
Flowfield of a heaving wing in uniform freestream: |
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email: mpeyeoks@nus.edu.sg |
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email: mpelimtt@nus.edu.sg |
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email: mpelkb@nus.edu.sg |