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Pressure-field extraction from Lagrangian flow measurements: first experiences with 4D-PTV data

Neeteson, Nathan J. and Bhattacharya, Samik and Rival, David E. and Michaelis, Dirk and Schanz, Daniel and Schröder, Andreas (2016) Pressure-field extraction from Lagrangian flow measurements: first experiences with 4D-PTV data. Experiments in Fluids. Springer. DOI: 10.1007/s00348-016-2170-4 ISSN 0723-4864

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Official URL: http://link.springer.com/article/10.1007/s00348-016-2170-4

Abstract

As a follow-up to a previous proof-of-principle study, a novel Lagrangian pressure-extraction technique is analytically evaluated, and experimentally validated using dense 4D-PTV data. The technique is analytically evaluated using the semi-three-dimensional Taylor–Green vortex, and it is found that the Lagrangian technique out-performs the standard Eulerian technique when Dirichlet boundary conditions are enforced. However, the Lagrangian technique produces worse estimates of the pressure field when Neumann boundary conditions are enforced on boundaries with strong pressure gradients. The technique is experimentally validated using flow data obtained for the case of a free-falling, index-matched sphere at Re = 2100. The experimental data were collected using a four-camera particle tracking velocimetry measurement system, and processed using 4D-PTV. The pressure field is then extracted using both the Eulerian and Lagrangian techniques, and the resulting pressure fields are compared. Qualitatively, the pressure fields agree; however, quantitative differences are found with respect to the magnitude of the pressure minima on the side of the sphere. Finally, the pressuredrag coefficient is estimated using each technique, and the two techniques are found to be in very close agreement. A comparison to a reference value from literature confirms that the drag coefficient estimates are reasonable, demonstrating the validity of the technique. Article: 102

Item URL in elib:https://elib.dlr.de/106145/
Document Type:Article
Additional Information:Published online: 01. Juni 2016
Title:Pressure-field extraction from Lagrangian flow measurements: first experiences with 4D-PTV data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Neeteson, Nathan J.njneetes (at) ucalgary.caUNSPECIFIED
Bhattacharya, SamikDepartment of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, CanadaUNSPECIFIED
Rival, David E.Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, CanadaUNSPECIFIED
Michaelis, DirkLaVision, GöttingenUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s00348-016-2170-4
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Pressure from PIV, Shake-The-Box, 3D PTV
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: Bachmann, Barbara
Deposited On:16 Dec 2016 12:26
Last Modified:06 Sep 2019 15:25

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