Abstract
Different from many existing studies on the parametrization ofvortices, we investigate the effectiveness of two new parameters foridentifying the vortex stretching and vortex relaxing mechanisms.These parameters are invariants and identify three-dimensional flowstructures only, i.e. they diminish in two-dimensional flows. This isalso unlike the existing vortex identification approaches which deliverinformation in two-dimensional flows. The present proposals have beensuccessfully applied to identify the stretching and relaxing vorticesin compressible mixing layers and natural convection flows.
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