Abstract
The development of Görtler vortices with pre-set wavelength of 15 mm has been visualized in the boundary-layer on a concave surface of 2.0 m radius of curvature at a free-stream velocity of 3.0 m/s. The wavelength of vortices was pre-set by vertical wires of 0.2 mm diameter located 10 mm upstream of the concave surface leading edge. The velocity contours in the cross-sectional planes at several streamwise locations show the growth and breakdown of the vortices. Three different regions can be identified based on different growth rate of the vortices. The occurrence of a secondary instability mode is indicated by the formation of a small horseshoe eddies generated between the two neighboring vortices traveling streamwise, to form mushroom-like structures as a consequence of the non-linear growth of the Görtler vortices.
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S. H. Winoto: He obtained his Ph.D. from Imperial College, London in 1980 and joined the National University of Singapore in the same year. He has been a Visiting Professor at Georgia Institute of Technology and University of Southern California and has been involved in organizing some international meetings in Singapore, such as the 7th Asian Symposium on Visualization, 3–7 November 2003. He is a member of the American Society of Mechanical Engineers (ASME), and has been the President/Chairman of the ASME Singapore Chapter/Section and also the Chairman of the Asia-Pacific Zone of ASME Region XIII. His research interests include boundary layer flows, jet flows and their application, flow visualizations and lubrication.
Hatsari Mitsudharmadi: He obtained his Master of Engineering (MEng) degree in Mechanical Engineering from National University of Singapore and currently he is pursuing a Ph.D. program at the Department of Mechanical Engineering in the same university. His research interests are boundary layer flows and hot-wire anemometry.
D. A. Shah: He obtained his Master of Engineering from Indian Institute of Science, Bangalore, India in 1980 and PhD from University of Newcastle, Australia in 1988. He spent about a year as a faculty member at the Indian Institute of Technology, Kanpur, India before joining the National University of Singapore in 1989. He has been involved in organising some international conferences in Singapore. He is a member of the American Society of Mechanical Engineers (ASME) and has served on a number of Committees in the ASME Singapore Section. His research interests include hot-wire anemometry, turbulent shear flows, bluff bodies and industrial aerodynamics.
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Winoto, S.H., Mitsudharmadi, H. & Shah, D.A. Visualizing Görtler vortices. J Vis 8, 315–322 (2005). https://doi.org/10.1007/BF03181550
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DOI: https://doi.org/10.1007/BF03181550