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Comparative Analysis of CFD and PIV Base Buffeting Data Considering Decomposition Techniques and Filtering Effects in the Measurement Chain

Horchler, Tim and Serhan, Chadi and Hannemann, Klaus and Blinde, Paul and Schrijer, Ferdinand (2015) Comparative Analysis of CFD and PIV Base Buffeting Data Considering Decomposition Techniques and Filtering Effects in the Measurement Chain. 3rd TRR 40 Summer Research Program 2015, 20. July - 14. Aug. 2015, Garching, Germany.

Full text not available from this repository.

Official URL: http://www.sfbtr40.de/index.php/de/sommerprogramm/sommerprogramm-2015/final-presentations-2015

Abstract

Significant dynamical loads on the nozzle structure of launch vehicles during ascent can cause deformations and eventually complete failure of rocket engines. This effect, known as base buffeting, has been observed for the Ariane V vehicle and is caused by a strong flow seperation at the base of the main body and subsequent reattachement on the nozzle. In order to investigate this phenomenon and to assess mitigation strategies, wind tunnel experiments and numerical simulations of a subscale wind tunnel model at transonic flight conditions have been conducted. This work compares an experimental and numerical dataset of a launch vehicle tail flow field in terms of Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD). Both methods allow to isolate dominant flow features and, in case of DMD, to determine an oscillation frequency associated with the mode. In order to account for the different spatial and temporal resolutions of the datasets, the numerical simulation data is subsampled and spatially filtered to match the experimental Particle Image Velocimetry (PIV) dataset as closely as possible. This approach also allows to assess the effect of spatio-temporal filtering on the CFD mode structure. Additionally, POD and DMD modes of the numerical surface pressure distribution are compared to high-resolution experimental surface pressure measurements.

Item URL in elib:https://elib.dlr.de/100219/
Document Type:Conference or Workshop Item (Speech)
Title:Comparative Analysis of CFD and PIV Base Buffeting Data Considering Decomposition Techniques and Filtering Effects in the Measurement Chain
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Horchler, Timtim.horchler (at) dlr.deUNSPECIFIED
Serhan, Chadichadi.serhan (at) dlr.deUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Blinde, PaulDelft Technical UniversityUNSPECIFIED
Schrijer, FerdinandDelft Technical UniversityUNSPECIFIED
Date:2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-17
Series Name:Sonderforschungsbereich/Transregio 40 – Summer Program Report 2015
Status:Published
Keywords:Computational Fluid Dynamics (CFD), Particle Image Velocimetry (PIV), Skalenauflösende Simulationen, Dynamic Mode Decomposition, Proper Orthogonal Decomposition, Datenanalyse, Base Buffeting
Event Title:3rd TRR 40 Summer Research Program 2015
Event Location:Garching, Germany
Event Type:Workshop
Event Dates:20. July - 14. Aug. 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:09 Dec 2015 09:38
Last Modified:10 May 2016 23:36

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