Balta, S;
Smith, FT;
(2018)
Fluid flowlifting a body from a solid surface.
Proceedings of the Royal Society A: Mathematical Physical and Engineering Sciences
, 474
(2219)
10.1098/rspa.2018.0286.
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Abstract
If a body is at rest on horizontal ground and a sudden horizontal flow of fluid is applied, the body either remains on the ground (rocking, rolling, sliding or spinning) or is lifted off impulsively. This lift-off is followed by a return to the ground or by a fly-away in the sense of continued departure from the ground. Related phenomena arise in the lift-off of an air vehicle from, effectively, moving ground. The present investigation seeks fairly precise mechanistic conditions under which lift-off and subsequent return or fly-away occur for a thin body or more generally for any thin gap of fluid between a body and the ground. Nonlinear fluid–solid interaction takes place in which the motion of the body and the surrounding fluid affect each other. Small-time analysis on lift-off and a numerical study are presented, followed by large-time analysis showing a critical flow speed for fly-away for any shape of the body. The changes in ground effect, from being dominant during lift-off to diminishing in fly-away, are explored together with relevant applications.
| Type: | Article |
|---|---|
| Title: | Fluid flowlifting a body from a solid surface |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1098/rspa.2018.0286 |
| Publisher version: | https://doi.org/10.1098/rspa.2018.0286 |
| Language: | English |
| Additional information: | © 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/ by/4.0/, which permits unrestricted use, provided the original author and source are credited |
| Keywords: | body, analysis, interaction, fluid, granular media |
| 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/10064412 |
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