Abstract
This paper reports results of our experimental investigation on flow instability on a flat plate laminar boundary layer caused by a “captive” vortex migrating far outside the boundary layer. Results show that the sign of the circulation associated with the vortex is the main determinant for the severity of the boundary layer instability. A captive vortex with an opposite sign to that of the unperturbed shear layer vorticity causes a breakdown ahead of it, while the one with the same sign as the unperturbed shear layer vorticity gives rise to weaker excitation trailing it. Additional parameters that influence the flow instability are the strength and distance of the vortical disturbance from the boundary layer, as well as the translational speed of the vortex. These experimental results compliment the corresponding theoretical analysis of Sengupta et al. (J Fluid Mech 493:277–286, 2003).
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Chattopadhyay M (2001) Instability and transition of wall bounded flows by free-stream excitation. Master of Engineering thesis, National University of Singapore
Diaz F, Gavalda J, Kawall, JG, Giralt F (1983) Vortex shedding from a spinning cylinder. Phys Fluids 26:3454–3460
Goldstein S (1938) Modern developments in fluid dynamics. Oxford University Press, Oxford
Jacobs RG, Durbin PA (2001) Simulation of bypass transition. J Fluid Mech 428:185–212
Kendall JM (1987) Experimental study of laminar boundary layer receptivity to a traveling pressure field. AIAA paper 87-1257
Liu X, Rodi W (1991) Experiments on transitional boundary layers with wake induced unsteadiness. J Fluid Mech 231:229–256
Matsubara M, Alfredsson PH (2001) Disturbance growth in boundary layers subjected to free stream turbulence. J Fluid Mech 430:149–168
Monin AS, Yaglom AM (1971) Statistical fluid mechanics: mechanics of turbulence. MIT Press, Cambridge, MA
Morkovin MV (1969) The many faces of transition. In: Wells CS (ed) Viscous drag reduction. Plenum Press, New York
Morkovin MV (1991) Panoramic view of changes in vorticity distribution in transition instabilities and turbulence. In: Reda DC, Reed HL, Kobayashi R (eds) Boundary layer stability and transition to turbulence. ASME, New York, FED 114:1–12
Prandtl L (1926) Application of the “Magnus Effect” to the wind propulsion of ships. NACA TM 387
Robertson JM (1969) Hydrodynamics in theory and application. Dover, New York
Schmid PJ, Henningson DS (2000) Stability and transition in shear flows. Springer, New York Berlin Heidelberg
Sengupta TK, Chattopadhyay M, Wang ZY, Yeo KS (2002) By-pass mechanism of transition to turbulence. J Fluids Struct 16:15–29
Sengupta TK, De S, Sarkar S (2003) Vortex-induced instability of incompressible wall-bounded shear layer. J Fluid Mech 493:277–286
Sengupta TK, Lim TT, Chattopadhyay M (2000) Experimental investigation of by-pass transition. Bull Am Phys Soc 45:114
Sengupta TK, Lim TT, Chattopadhyay M (2001) By-pass transition—experiments and theory. Department of Aerospace Engineering Report IIT-KNP-AE-02, IIT Kanpur, India
Sengupta TK, Nair MT (1997) A new class of waves for Blasius boundary layer. In: Proceedings of the 7th Asian Congress on Fluid mechanics. Allied Publishers, Chennai, India, pp 785–788
Sengupta TK, Nair MT, Rana V (1997) Boundary layer excited by low frequency disturbances—Klebanoff mode. J Fluids Struct 11:845–853
Sengupta TK, Wang ZY, Yeo KS, Chattopadhyay M (1999) Receptivity to convected vortices—by-pass route. In: Cui E (ed) Proceedings of 8th Asian Congress on Fluid mechanics. International Academic Publisher, Beijing, pp 964–968
Taylor GI (1936) Statistical theory of turbulence. V. Effects of turbulence on boundary layer. Proc R Soc A 156(888):307–317
Tokumaru PT, Dimotakis PE (1993) The lift of a cylinder executing rotary motion in a uniform flow. J Fluid Mech 255:1–10
Wu X, Jacobs RG, Hunt JCR, Durbin PA (1999) Simulation of boundary layer transition induced by periodically passing wakes. J Fluid Mech 399:109–153
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Lim, T.T., Sengupta, T.K. & Chattopadhyay, M. A visual study of vortex-induced subcritical instability on a flat plate laminar boundary layer. Exp Fluids 37, 47–55 (2004). https://doi.org/10.1007/s00348-004-0783-5
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DOI: https://doi.org/10.1007/s00348-004-0783-5