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https://hdl.handle.net/2440/95718
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Type: | Journal article |
Title: | The effect of seam imperfections on the unsteady flow within a fluid-filled torus |
Author: | Calabretto, S. Mattner, T. Denier, J. |
Citation: | Journal of Fluid Mechanics, 2015; 767:240-253 |
Publisher: | Cambridge University Press |
Issue Date: | 2015 |
ISSN: | 0022-1120 1469-7645 |
Statement of Responsibility: | Sophie A.W. Calabretto, Trent W. Mattner and James P. Denier |
Abstract: | We consider the behaviour of the flow within a fluid-filled torus when there is a sudden change in the rotation rate of the torus. Experimental work on this problem by Madden & Mullin (J. Fluid Mech., vol. 265, 1994, p. 217) demonstrated a flow with a rich and complex dynamics. In particular, planar (top-down) flow visualisation images show a well-defined laminar band at both the inner and outer bend of the toroidal pipe. Hewitt et al. (J. Fluid Mech., vol. 688, 2011, pp. 88–119) demonstrated the existence of finite-time singularities in the resulting viscous boundary layers, and linked the post-singularity structure to one of the laminar bands identified in experiments (Madden & Mullin J. Fluid Mech., vol. 265, 1994, p. 217; del Pino et al. Phys. Fluids, vol. 20 (12), 2008, 124104). The second band (or laminar front) identified by Madden & Mullin was conjectured by Hewitt et al. to be the result of a centrifugal instability, perhaps generated by small imperfections in the experimental apparatus. Here we explore this conjecture further, demonstrating that a small seam imperfection can generate substantial secondary motion but with considerably different dynamics than the centrifugally driven instability of Hewitt et al. |
Keywords: | Boundary layers; boundary layer separation; boundary layer stability |
Rights: | © Cambridge University Press 2015 |
DOI: | 10.1017/jfm.2015.46 |
Published version: | http://dx.doi.org/10.1017/jfm.2015.46 |
Appears in Collections: | Aurora harvest 7 Mathematical Sciences publications |
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