Abstract
Coherent features of vortex structure and dynamics are investigated statistically in pseudo-spectral numerical simulations of moderate Reynolds number turbulence. The alignment of the vorticity vector with a principal axis of the rate of strain is investigated with an emphasis on its time development in turbulence decay from a random gaussian field. In addition, a tendency in developed turbulence for velocity vectors to lie in a plane formed by the two principal stretching directions is reported, leading to an explanation of depletion of nonlinearity in turbulence. The spatial and temporal coherence of vortex structures is further studied using recently developed techniques which combine dynamical visualization with statistical sampling analysis.
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She, ZS., Jackson, E., Orszag, S.A. (1991). Statistical Aspects of Vortex Dynamics in Turbulence. In: Sirovich, L. (eds) New Perspectives in Turbulence. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3156-1_12
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DOI: https://doi.org/10.1007/978-1-4612-3156-1_12
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-7817-7
Online ISBN: 978-1-4612-3156-1
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