Abstract
This paper addresses the role of solid boundaries on the evolution of decaying 2D turbulence on a finite domain. It is demonstrated by laboratory experiments and numerical simulations of (quasi-) 2D flows on both square and circular domains that the lateral walls (i) act as sources of vorticity filaments which affect the flow evolution in the interior, and (ii) provide normal and shear stresses that may exert torques, thus causing changes in the net angular momentum of the contained fluid. It is also discussed how the net angular momentum L 0 affects the subsequent flow evolution and how it determines the structure of the ‘final state’.
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