Particle tracking velocimetry (PTV) and its application to analyse free surface flows in laboratory scale models

Béla Sokoray-Varga, J. Józsa

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The methodology and application of particle tracking velocimetry (PTV) for surface flow velocity measurements are presented in a conventional laboratory scale model characterised both by large vortices and turbulence, making use of the fact that PTV allows to take reliable measurements in flows exposed to strong deformations typical in turbulent shear layers. The experimental setup included a river reach with main channel and wide floodplain of different roughness. Surface PTV measurements were carried out by a CCD camera with 30 frames per second frame rate and vertical camera axis. In the evaluation of the recordings an algorithm suitable to be applied in flows with strong strains was needed, capable to find corresponding particles even by highly deformed neighbourhoods. For this aim a modification of the so-called velocity gradient tensor method was used. The reconstructed velocity fields were used first to visualize the mean flow field, then to identify and investigate the various flow structures by means of the swirling strength analysis.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalPeriodica Polytechnica: Civil Engineering
Volume52
Issue number2
DOIs
Publication statusPublished - 2008

Fingerprint

free surface flow
Velocity measurement
flow structure
Flow measurement
Flow structure
CCD cameras
Flow velocity
flow velocity
flow field
Tensors
roughness
vortex
floodplain
Flow fields
Vortex flow
Turbulence
turbulence
Surface roughness
Rivers
Cameras

Keywords

  • Laboratory scale model
  • Particle Tracking Velocimetry (PTV)
  • PIV
  • Surface velocity measurement

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

Cite this

Particle tracking velocimetry (PTV) and its application to analyse free surface flows in laboratory scale models. / Sokoray-Varga, Béla; Józsa, J.

In: Periodica Polytechnica: Civil Engineering, Vol. 52, No. 2, 2008, p. 63-71.

Research output: Contribution to journalArticle

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