Pruessner, L;
Smith, F;
(2015)
Enhanced effects from tiny flexible in-wall blips and shear flow.
Journal of Fluid Mechanics
, 772
pp. 16-41.
10.1017/jfm.2015.193.
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Abstract
Fluid motion at high Reynolds number over a flexible in-wall blip (a compliant bump or dip in an otherwise fixed wall) is considered theoretically for a very short blip buried low inside a boundary layer. Only the near-wall shear of the oncoming flow affects the local motion past the tiny blip. Slowly evolving features are examined first to allow for variations in the incident flow. Linear and nonlinear solutions show that at certain parameter values (eigenvalues) intensifications occur in which the interactive effect on flow and blip shape is larger by an order of magnitude than at most parameter values. Similar findings apply to the boundary layer with several tiny blips present or to channel flows with blips of almost any length. These intensifications lead on to fully nonlinear unsteady motion as a second stage, after some delay, thus combining with finite-time breakups to form a distinct path into transition of the flow.
| Type: | Article |
|---|---|
| Title: | Enhanced effects from tiny flexible in-wall blips and shear flow |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1017/jfm.2015.193 |
| Publisher version: | http://dx.doi.org/10.1017/jfm.2015.193 |
| Language: | English |
| Additional information: | Copyright © 2015 Cambridge University Press. |
| Keywords: | drag reduction, flow-structure interactions, flow-vessel interactions |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1478336 |
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