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Pressure-Field Extraction from Lagrangian Flow Measurements

Neeteson, Nathan J. and Bhattacharya, Samik and Rival, David E. and Michaelis, Dirk and Schanz, Daniel and Schröder, Andreas (2015) Pressure-Field Extraction from Lagrangian Flow Measurements. 11th International Symposium on Particle Image Velocimetry - PIV15 -, 14. - 16. Sept. 2015, Santa Barbara, CA, USA.

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Official URL: http://www.piv2015.org/


As a follow-up to a previous proof-of-principle study, a novel Lagrangian pressure-extraction technique is analytically evaluated and experimentally validated. This technique employs a Poisson solver to extract the instantaneous pressure field on a network connecting scattered Lagrangian data. The technique is analytically evaluated using the semi-three-dimensional Taylor-Green vortex, and experimentally validated using flow data obtained for the case of a free-falling, index-matched sphere at Re = 2100. The experimental data was collected using a four-camera particle tracking velocimetry measurement system, and processed using the recently-developed Shake-The-Box algorithm. In the analytical evaluation, it is found that the Lagrangian technique out-performs the standard Eulerian technique when Dirichlet boundary conditions are enforced. However, the Lagrangian technique suffers when Neumann boundary conditions are enforced. In order to validate the experimental results, the surface pressure on the sphere is compared to results from literature, and is found to be in agreement. Based on the extracted pressure fields, the pressure-drag coefficient of the sphere is calculated, and the resulting estimate compares favourably with the expected value from literature. It is concluded that there is a clear advantage in using the proposed Lagrangian technique compared to interpolating Lagrangian flow data to a grid, and that further investigation into Lagrangian analysis techniques is merited.

Item URL in elib:https://elib.dlr.de/98183/
Document Type:Conference or Workshop Item (Speech)
Title:Pressure-Field Extraction from Lagrangian Flow Measurements
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, Göttingen, GermanyUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-18
Series Name:Conference Proceedings USB-Stick
Keywords:Lagrangian Flow Measurements, Shake-The-Box (STB), tomo PIV, successive over-relaxation (SOR), Glowinski-Pirroneau decomposition
Event Title:11th International Symposium on Particle Image Velocimetry - PIV15 -
Event Location:Santa Barbara, CA, USA
Event Type:international Conference
Event Dates:14. - 16. Sept. 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:09 Oct 2015 10:04
Last Modified:09 Oct 2015 10:04

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