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キーワード:
turbulence; Lagrangian turbulence; two-dimensional turbulence; decaying
turbulence; dynamical systems
要旨:
We present a numerical investigation of two-dimensional decaying
turbulence in the Lagrangian framework. Focusing on single particle
statistics, we investigate Lagrangian trajectories in a freely evolving
turbulent velocity field. The dynamical evolution of the tracer
particles is strongly dominated by the emergence and evolution of
coherent structures. For a statistical analysis we focus on the
Lagrangian acceleration as a central quantity. For more geometrical
aspects we investigate the curvature along the trajectories. We find
strong signatures for the self-similar universal behavior. (c) 2008
Elsevier B.V. All rights reserved.
