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PIV Analysis of Prandtl's Flow Visualization Movies

Willert, Christian and Gharib, Morteza and Kompenhans, Jürgen (2009) PIV Analysis of Prandtl's Flow Visualization Movies. 62nd Annual Meeting of the APS Division of Fluid Dynamics, 22.-24. Nov. 2009, Minneapolis, MN, USA.

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Official URL: http://meetings.aps.org/link/BAPS.2009.DFD.ML.1


Probably some of the oldest time-resolved PIV image sequences still available today were recorded on film during the late 1920's and early 1930's by Prandtl and his colleagues Tietjens and Müller using free surface water flumes at the Kaiser-Wilhelm-Institute for Fluid Research (Göttingen), now the Max Planck Institute for Self Organisation. Recorded at 20 frames per second the films visualize the process of unsteady flow separation and vortex generation on surface piercing objects such as airfoils or cylinders. The visualization was achieved by means of small particles (aluminum powder, ferrous mica or lycopodium powder) scattered on the water surface. Illumination from above resulted in high contrast images of the random particle distribution that are very well suited for PIV analysis. Modern PIV software is used to process digitized versions of the films, made available by the "Institut für wissenschaftlichen Film" (www.iwf.de) in Göttingen. In addition to the surface flow field the time evolving vorticity field and other quantities can now be visualized which by itself shows the importance of carefully documenting and archiving valuable data.

Document Type:Conference or Workshop Item (Speech)
Title:PIV Analysis of Prandtl's Flow Visualization Movies
AuthorsInstitution or Email of Authors
Willert, Christianchris.willert@dlr.de
Gharib, MortezaCalifornia Institute of Technology
Kompenhans, Jürgenjuergen.kompenhans@dlr.de
Date:24 November 2009
Keywords:particle image velocimetry, flow visualization, surface flows, flow separation, fluid mechanics
Event Title:62nd Annual Meeting of the APS Division of Fluid Dynamics
Event Location:Minneapolis, MN, USA
Event Type:international Conference
Event Dates:22.-24. Nov. 2009
Organizer:University of Minnesota
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Köln-Porz , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Institute of Propulsion Technology
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.phil. Christian Willert
Deposited On:12 Mar 2010 15:28
Last Modified:12 Mar 2010 15:28

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