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J. Fluid Mech. (2006), vol. 553, pp. 119141. c 2006 Cambridge University Press doi:10.1017/S0022112006008986 Printed in the United Kingdom
 

Summary: J. Fluid Mech. (2006), vol. 553, pp. 119141. c 2006 Cambridge University Press
doi:10.1017/S0022112006008986 Printed in the United Kingdom
119
Wakes and vortex streets generated by
translating force and force doublet: laboratory
experiments
By Y. D. AFANASYEV AND V. N. KORABEL
Memorial University of Newfoundland, Department of Physics and Physical Oceanography,
St John's, NL, Canada, A1B 3X7
yakov@physics.mun.ca
(Received 8 November 2004 and in revised form 26 October 2005)
Wakes and vortex streets such as those occurring behind towed or self-propelled
bodies are generated by moving localized forces in a viscous fluid at moderate values
of the Reynolds number, Re 102
. The forcing is provided by an electromagnetic
method and allows us to create a `virtual' body without introducing any solid objects
into the fluid. Characteristics of stable and unstable wakes, in particular the shedding
frequency, are measured in the space of control parameters, namely the magnitude
of the forcing and the speed of translational motion of the forcing. The results for a
single force presented in the dimensionless form of the Strouhal number demonstrate

  

Source: Afanassiev, Iakov - Department of Physics and Physical Oceanography, Memorial University of Newfoundland

 

Collections: Geosciences