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Computational investigation of cavity flow control using a passive device

Content Provider	Semantic Scholar
Author	Khanal, Bijay
Copyright Year	2012
Abstract	In this paper, flow control effectiveness of a passive device in relation to open cavity flowfield is investigated computationally and compared with experimental work. Specifically the modification in the cavity flowfield due to the presence of a spoiler is studied in details to explain the physics behind the flow control effects. A combination of 2D and 3D flow visualisation tools are used to understand the flow behaviour inside the cavity and the quantitative analysis of the unsteady pressure fluctuations is also performed to assess the unsteady effects. Flow simulations with a turbulence model based on a hybrid RANS/LES (commonly known as Detached-Eddy Simulation (DES)) are used in this study. The time-mean flow visualisation clearly showed the presence of three dimensional effects inside the empty cavity whereas the 3D effects were found to diminish in the presence of a spoiler. In the unsteady flow analysis, near-field acoustic spectra were computed for empty cavity as well as cavity-with-spoiler cases. Study of unsteady pressure spectra for the cavity-with-spoiler case was found to record the complete suppression of the dominant tones in the presence of the spoiler. The analysis has indicated that the main reason behind this suppression is due to the inability of faintly energised vortical structures (faintly energised as a result of the extraction of turbulent kinetic energy by the spoiler) to maintain the unsteady flapping of the separated shear layer. THE AERONAUTICAL JOURNAL FEBRUARY 2012 VOLUME 116 NO 1176 153 Computational investigation of cavity flow control using a passive device B. Khanal bidur.khanal@eng.ox.ac.uk Department of Engineering Science University of Oxford Oxford, UK K. Knowles A. J. Saddington (k.knowles@cranfield.ac.uk a.j.saddington@cranfield.ac.uk Aeromechanical Systems Group Cranfield University Shrivenham, UK Paper No. 3667. Manuscript received 18 November 2010, revised version received 6 June 2011, accepted 28 June 2011. 3667:New Resized Aero Journal 2012 31/01/2012 14:42 Page 153
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.aerosociety.com/Assets/Docs/Protected/Subscribers/AeroJournal/3667.pdf
Language	English
Access Restriction	Open
Subject Keyword	Acoustic cryptanalysis Body cavities Cavity quantum electrodynamics Coefficient Computation Data-flow analysis Dental caries Detached eddy simulation Diethylstilbestrol Excitation Excite Feedback Fleck corneal dystrophy Flow control (data) Image warping Kinetics Large eddy simulation Manuscripts Resonance Revision procedure Transverse wave Turbulence kinetic energy Turbulence modeling Vortex Windows Aero Zero suppression stage IV adenoid cystic carcinoma of the oral cavity
Content Type	Text
Resource Type	Article

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