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FFT integration of instantaneous 3D pressure gradient fields measured by Lagrangian particle tracking in turbulent flows

Huhn, Florian and Schanz, Daniel and Gesemann, Sebastian and Schröder, Andreas (2016) FFT integration of instantaneous 3D pressure gradient fields measured by Lagrangian particle tracking in turbulent flows. Experiments in Fluids. Springer. DOI: 10.1007/s00348-016-2236-3 ISSN 0723-4864

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Official URL: https://link.springer.com/article/10.1007/s00348-016-2236-3

Abstract

Pressure gradient fields in unsteady flows can be estimated through flow measurements of the material acceleration in the fluid and the assumption of the governing momentum equation. In order to derive pressure from its gradient, almost exclusively two numerical methods have been used to spatially integrate the pressure gradient until now: first, direct path integration in the spatial domain, and second, the iterative solution of the Poisson equation. Instead, we propose an alternative third method that integrates the pressure gradient field in Fourier space. The method is fast (non-iterative) and does not need additional boundary conditions of the pressure field. We demonstrate the integration scheme on a synthetic pressure field and on an experimental example based on time-resolved acceleration data from high resolution Lagrangian particle tracking with the Shake-The-Box method.

Item URL in elib:https://elib.dlr.de/103452/
Document Type:Article
Additional Information:Published online: 02. September 2016
Title:FFT integration of instantaneous 3D pressure gradient fields measured by Lagrangian particle tracking in turbulent flows
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Huhn, Florianflorian.huhn (at) dlr.deUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Gesemann, Sebastiansebastian.gesemann (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/s00348-016-2236-3
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Lagrangian particle tracking, Pressure reconstruction, Shake-The-Box
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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