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Unsteady separation past moving surfaces

Degani, AT; Walker, JDA; Smith, FT; (1998) Unsteady separation past moving surfaces. J FLUID MECH , 375 1 - 38. 10.1017/S0022112098001839. Green open access

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Abstract

Unsteady boundary-layer development over moving walls in the limit of infinite Reynolds number is investigated using both the Eulerian and Lagrangian formulations. To illustrate general trends, two model problems are considered, namely the translating and rotating circular cylinder and a vortex convected in a uniform flow above an infinite flat plate. To enhance computational speed and accuracy for the Lagrangian formulation, a remeshing algorithm is developed. The calculated results show that unsteady separation is delayed with increasing wall speed and is eventually suppressed when the speed of the separation singularity approaches that of the local mainstream velocity. This suppression is also described analytically. Only 'upstream-slipping' separation is found to occur in the model problems. The changes in the topological features of the flow just prior to the separation that occur with increasing wall speed are discussed.

Type: Article
Title: Unsteady separation past moving surfaces
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/S0022112098001839
Publisher version: http://dx.doi.org/10.1017/S0022112098001839
Language: English
Additional information: © 1998 Cambridge University Press
Keywords: BOUNDARY-LAYER SEPARATION, VORTEX, FLOW, WALL
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/82776
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