Extraction of multi-scale vortical structures from a homogeneous isotropic turbulence

Waleed Abdel Kareem, Seiichiro Izawa, Ao Kui Xiong, Yu Fukunishi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

An attempt to extract multi-scaled vortical structures from a turbulent field is carried out. The Lattice Boltzmann method with forcing is used to generate a statistically stationary velocity field in a resolution of 256 3. Two methods for filtering, namely the Fourier and wavelet decompositions, are used in the investigation and the results are compared. Three fields that contain vortical structures of different-scales area extracted from the original turbulent field. It is found that the results obtained by the two methods overlap at a high rate. Several universal characteristics among the filtered flow fields are found in the comparisons using the invariants of the velocity gradient, rotation and deformation tensors.

Original languageEnglish
Title of host publicationIUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence
Pages143-148
Number of pages6
DOIs
Publication statusPublished - 2008 Dec 1
EventIUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Nagoya, Japan
Duration: 2006 Sep 112006 Sep 14

Publication series

NameSolid Mechanics and its Applications
Volume4
ISSN (Print)1875-3507

Other

OtherIUTAM Symposium on Computational Physics and New Perspectives in Turbulence
CountryJapan
CityNagoya
Period06/9/1106/9/14

Keywords

  • Fourier filter
  • Lattice Boltzmann method
  • Multi-scaled vortices
  • Velocity gradient analysis
  • Wavelet filter

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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