Lagrangian investigation of two-dimensional decaying turbulence

PHYSICA D-NONLINEAR PHENOMENA

卷:237

Article

Wilczek, Michael¹  Kamps, Oliver¹  Friedrich, Rudolf¹ 

[1] Univ Munster, Inst Theoret Phys, D-48149 Munster, Germany

关键词: turbulence;    Lagrangian turbulence;    two-dimensional turbulence;    decaying turbulence;    dynamical systems;   

DOI  :  10.1016/j.physd.2008.01.013

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free