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Geophysical and Astrophysical Fluid Dynamics Vol. 98, No. 1, February 2004, pp. 120
 

Summary: Geophysical and Astrophysical Fluid Dynamics
Vol. 98, No. 1, February 2004, pp. 120
DECAYING QUASI-TWO-DIMENSIONAL
TURBULENCE IN A RECTANGULAR
CONTAINER: LABORATORY EXPERIMENTS
J. WELLS and YA.D. AFANASYEV*
Department of Physics and Physical Oceanography, Memorial University of Newfoundland,
St. John's, NL, Canada
(Received 8 May 2003; In final form 8 July 2003)
Results from a new series of experiments on quasi-two-dimensional turbulence decaying in a rectangular
container are presented. The flows are generated electromagnetically in a thin layer of conducting fluid
when different configurations of permanent magnets are used to specify the initial characteristics of the
flow. The particle image velocimetry method is used to determine the velocity and vorticity fields. These
fields are further used to determine the global characteristics of the flow such as the energy, enstrophy and
the net angular momentum with respect to the center of the container. The experimental results demonstrate
that variations of net angular momentum occur due to the interactions of coherent vortex dipoles/jets with the
walls of the container. The variation of the angular momentum of the system, which occurs due to the action
of stresses at the solid boundary, can be obtained quantitatively if the initial linear impulse exerted by the
magnets on the fluid is known. An analysis of external forces and torques allows one to predict that
during the intermediate state of the flow evolution the pattern of the flow will be a rotating quadrupole.

  

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

 

Collections: Geosciences