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Fusing computational and experimental data with Gappy POD for harmonized aerodynamic data

Görtz, Stefan and Mifsud, Michael (2011) Fusing computational and experimental data with Gappy POD for harmonized aerodynamic data. CFD and Experiment – Integration of Simulation Workshop, 5.-6. April 2011, Göttingen, Deutschland.

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Abstract

Gappy Proper Orthogonal Decomposition (POD) is a simple but powerful method for data fusion and offers efficient means to harmonize data, i.e. improve the consistency between various sets of data. The basic idea behind Gappy POD for data fusion is that the POD analysis of computational flow solutions at different flow conditions yields a set of empirical modes, which describes the dominant behavior or dynamics of a given flow problem in an optimal sense, i.e. for any given basis size, the error between the original and reconstructed data is minimized. Given a suitable set of POD modes derived from computational data, the Gappy POD solves a small and thus inexpensive least squares problem to determine a set of coefficients such that the reconstruction (linear combination of modes) optimally matches the experimental data. Besides its capability to harmonize data, the Gappy POD approach offers additional benefits, such as the prediction of quantities that were not measured experimentally. It can also be seen as a way to correct complete numerical flow solutions if limited experimental data is available. The lecture will present the Gappy POD in the context of aircraft aerodynamics and Particle Image Velocimetry (PIV).

Item URL in elib:https://elib.dlr.de/72414/
Document Type:Conference or Workshop Item (Speech)
Title:Fusing computational and experimental data with Gappy POD for harmonized aerodynamic data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Görtz, StefanUNSPECIFIEDUNSPECIFIED
Mifsud, MichaelUNSPECIFIEDUNSPECIFIED
Date:5 April 2011
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CFD, wind-tunnel data, POD, Gappy POD, PIV
Event Title:CFD and Experiment – Integration of Simulation Workshop
Event Location:Göttingen, Deutschland
Event Type:Workshop
Event Dates:5.-6. April 2011
Organizer:DGLR-Querschnittsbereich Thermo- and Fluiddynamics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > CASE
Deposited By: Görtz, Stefan
Deposited On:06 Dec 2011 15:06
Last Modified:06 Dec 2011 15:06

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