Geometric nature of particle trajectories in isotropic turbulence

Yongnam Park, Yeontaek Choi, Changhoon Lee

Research output: Contribution to conferencePaper

Abstract

Characteristics of curvature and torsion of particle trajectories are investigated by using direct numerical simulations. Curvature, torsion and their ratio are expected to have crucial roles in identification of the vortical structures. Curvature and torsion are highly intermittent and their PDFs show a rigorous slope in log-log scale which indicates selfsimilar power-law behavior. It is well known that extremely high curvature comes from nearly zero-velocity event, but for the case of torsion it is not clealy explained. We found that the magnitude of torsion is determined mainly by the magnitude of |a|/|an||u|, but detailed physical interpretation of |a|/|an||u| is required. Enstrophy-conditional PDF and various Stokes number cases for heavy particles are also investigated, but they give almost the same shape of PDF, and that self-similar characteristics of curvature and torsion are not related with turbulent structures.

Original languageEnglish
Publication statusPublished - 2011 Jan 1
Event7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada
Duration: 2011 Jul 282011 Jul 31

Other

Other7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
CountryCanada
CityOttawa
Period11/7/2811/7/31

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

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    Park, Y., Choi, Y., & Lee, C. (2011). Geometric nature of particle trajectories in isotropic turbulence. Paper presented at 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011, Ottawa, Canada.