Two scale experiments via particle tracking velocimetry: A feasibility study

Matthias Kinzel, Markus Holzner, Beat Lüthi, Alexander Liberzon, Cameron Tropea, Wolfgang Kinzelbach

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In preparation of simultaneous large-scale/small-scale 3D Particle Tracking Velocimetry (3D-PTV) experiments in a developing turbulent flow we performed two types of measurements separately: (i) the velocity and coarse-grained velocity derivatives were measured in a large observation volume with focus on the large-scale flow features and (ii) spatially resolved velocity derivatives were measured in a small observation volume with the goal to obtain small-scale quantities associated with vorticity and strain. In this contribution we demonstrate that the characteristic flow structures were captured and velocity derivatives were accessed with sufficient accuracy. The problem of measuring velocity derivatives both in the Lagrangian and Eulerian frame of reference is also addressed. Although comparable accuracies in both settings could be achieved with our method, only statistics obtained from the spatially resolved measurement were found to be practically the same in both settings.

Original languageEnglish
Title of host publicationImaging Measurement Methods for Flow Analysis
Subtitle of host publicationResults of the DFG Priority Programme 1147 "Imaging Measurement Methods for Flow Analysis" 2003-2009
EditorsWolfgang Nitsche, Christoph Dobriloff
Pages103-111
Number of pages9
DOIs
StatePublished - 2009

Publication series

NameNotes on Numerical Fluid Mechanics and Multidisciplinary Design
Volume106
ISSN (Print)1612-2909

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