Formation of vortex wakes at flow separation from plate
D.N. Gorelov and A.I. Govorova
Omsk Branch of Sobolev Institute of Mathematics SB RAS, Omsk,
Russia
E-mail: gorelov@ofim.oscsbras.ru, govorovaai@mail.ru
Keywords: separated flow past plate, self-sustained vortex-wake oscillations, Karman street
Pages: 361–368
Abstract
The plane nonlinear
initial boundary value problem about the separated flow past a plate set in
motion at a constant velocity from the state of rest has been considered.
Results of a numerical experiment which have allowed us to trace in detail the
vortex-wake formation process behind a vertical plate are reported. It is shown
that, after the beginning of the plate
motion, several stable vortical structures, including a Karman street, form in
succession behind the plate. It is found that, on the emergence of
the Karman street, there occurs a sharp and substantial growth of vortex-wake
intensity and hydrodynamic drag force with a pulsating time behavior. A
conclusion about the origination, in this regime, of self-sustained oscillations
of the liquid in the vicinity of the plate is drawn.
DOI: 10.1134/S0869864317030052
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