Journal
PHYSICS OF FLUIDS
Volume 18, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2201474
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Results of numerical simulations provide further insight on the physical mechanisms associated with symmetric vortex merger. The relative contributions of filament and exchange band fluid to the reduction in the vortex separation are determined and the latter is found to be dominant. A key underlying process is the interaction of strain rate and vorticity gradient near the center of rotation, through which a tilt in the vorticity contours is established. This leads to the entrainment of core fluid into the exchange band, which is transformed into a single vortex. (C) 2006 American Institute of Physics.
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