Detection of coherent structures in an open-channel cavity flow using wavelet transforms

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

Abstract

In the present paper, organized turbulent motions in an open-channel cavity flow are examined by using wavelet transforms. Experimental data of velocity vectors are obtained by particle image velocimetry (PIV). At first, a multiresolution approximation (MRA) is employed to decompose the PIV velocity data into components of the organized turbulence and the mean flow structures. Then, distributions of an instantaneous Reynolds stress in the organized turbulence are analyzed using a two-dimensional continuous wavelet transform (2D-CWT) in order to detect the coherent structures with their spatial scales and locations. From the results of the wavelet analyses, behaviour of the organized motions along the mixing layer of the open-channel cavity, such as the evolution of the spatial scale and advection velocity, are discussed in different hydraulic conditions.

Original languageEnglish
Title of host publication4th World Congress in Industrial Process Tomography
PublisherInternational Society for Industrial Process Tomography
Pages1036-1041
Number of pages6
ISBN (Electronic)9780853163206
Publication statusPublished - 2005 Jan 1
Externally publishedYes
Event4th World Congress in Industrial Process Tomography - Aizu, Japan
Duration: 2005 Sep 52005 Sep 5

Publication series

Name4th World Congress in Industrial Process Tomography

Conference

Conference4th World Congress in Industrial Process Tomography
CountryJapan
CityAizu
Period05/9/505/9/5

Keywords

  • Cavity
  • Open-channel flow
  • Organized motion
  • Turbulent mixing layer
  • Wavelet transform

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computational Mechanics
  • Computer Vision and Pattern Recognition
  • Computer Science Applications

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  • Cite this

    Miyamoto, H. (2005). Detection of coherent structures in an open-channel cavity flow using wavelet transforms. In 4th World Congress in Industrial Process Tomography (pp. 1036-1041). (4th World Congress in Industrial Process Tomography). International Society for Industrial Process Tomography.