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Turbulent shear flow investigations using 4D-PTV “Shake-The-Box” (STB)

Schröder, Andreas and Schanz, Daniel and Gesemann, Sebastian and Novara, Matteo and Huhn, Florian (2015) Turbulent shear flow investigations using 4D-PTV “Shake-The-Box” (STB). WORKSHOP on Wall Turbulence and Advanced Measurement Techniques, 18. May 2015, Lille, France.

Full text not available from this repository.

Abstract

For all PIV based approaches the spatial resolution of the local instantaneous velocity measurement is limited by the correlation window size (and the light-sheet thickness), which acts as a low-pass filter biasing the measurement in presence of strong velocity gradients. Further basic limitations of PIV are the low dynamic velocity range (DVR) which is typically in the order of 1:100 and the dynamic spatial range (DSR), which is basically limited by the resolution of the used camera sensor (and the correlation window size). Several methods have been developed in order to overcome these limitations (image deformation and variational approaches); but only particle-tracking (PTV) have been found capable of delivering reliable results for the mean flow statistics in strong-shear flow or near interfaces and walls. While the full Reynolds stress tensor in such flows is only achievable by long-term statistics of3D-PTV, 4D-PTV „Shake-The-Box“ and FlowFit enables experimental investigations of flow velocities and topologies in time and space as well as global and local statistics by spatially high-resolved volumes in an Eulerian- and a Lagrangian- reference frame at the same time. The principle of „Shake-The-Box“(STB) and the difference between Eulerian and Lagrangian frames of reference are explained briefly. Results of STB measurements in the Periodic Hill (ERCOFTAC Test Case 81) flow and of a Large-Scale Thermal Plume using Helium-Filled-Soap- Bubbles (HFSB) are presented. Both experimental investigations demonstrate the advantages of STB for gaining high velocity estimation accuracies at high seeding densities without spatial filtering and bias errors.

Item URL in elib:https://elib.dlr.de/96422/
Document Type:Conference or Workshop Item (Speech)
Title:Turbulent shear flow investigations using 4D-PTV “Shake-The-Box” (STB)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder, Andreasandreas.schroeder (at) dlr.deUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Gesemann, Sebastiansebastian.gesemann (at) dlr.deUNSPECIFIED
Novara, Matteomatteo.novara (at) dlr.deUNSPECIFIED
Huhn, Florianflorian.huhn (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:PTV, Turbulent shear flow, Periodic Hill, Shake-The-Box, Helium-Filled-Soap-Bubbles
Event Title:WORKSHOP on Wall Turbulence and Advanced Measurement Techniques
Event Location:Lille, France
Event Type:Workshop
Event Dates:18. May 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:16 Jun 2015 10:54
Last Modified:16 Jun 2015 10:54

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