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Reduced-order coherent structures in active flow separation control using a bio-inspired flapping actuator

Ma, Yingyu and Schröder, Andreas (2018) Reduced-order coherent structures in active flow separation control using a bio-inspired flapping actuator. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 232 (14), pp. 2536-2545. SAGE Publications. DOI: 10.1177/0954406217752531 ISSN 0954-4062

Full text not available from this repository.

Official URL: https://doi.org/10.1177/0954406217752531

Abstract

An experimental study was conducted to investigate large-scale coherent structures induced by a bio-inspired flapping actuator in a turbulent backward-facing step flow. The flow field velocity dataset in the horizontal-vertical plane was obtained by planar particle image velocimetry. The flapping actuator was implemented over the step edge and it was driven to vertically oscillate, generating periodic small perturbations into the separated shear layer. As a result of active flow control, time-averaged reattachment length was reduced by 31% and Reynolds stresses as well as in-plane turbulent kinetic energy in the separated shear layer were considerably increased. In proper orthogonal decomposition analysis, the first two modes are found to be phase-correlated in the phase portrait of the coefficients. Therefore, reduced-order coherent structures are reconstructed by the first two modes, showing the phase evolution of the vortex shedding process. The extracted reduced-order coherent structures provide a better understanding of the underlying flow physics and are beneficial to effective flow separation control.

Item URL in elib:https://elib.dlr.de/122425/
Document Type:Article
Additional Information:Online ISSN: 2041-2983, Article first published online: January 10, 2018; Issue published: July 1, 2018
Title:Reduced-order coherent structures in active flow separation control using a bio-inspired flapping actuator
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ma, YingyuAS-EXVUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Date:1 July 2018
Journal or Publication Title:Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:232
DOI :10.1177/0954406217752531
Page Range:pp. 2536-2545
Publisher:SAGE Publications
Series Name:SAGE Journals
ISSN:0954-4062
Status:Published
Keywords:Active flow control, reduced-order, coherent structure, particle image velocimetry, proper orthogonal decomposition
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
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 for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:05 Dec 2018 10:45
Last Modified:05 Dec 2018 10:45

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