Results 221 to 230 of about 175,278 (262)
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Passive Control of Pressure Fluctuations Generated by Separated Flow
AIAA Journal, 1996Measurements of wall-pressure fluctuations have been made in the flow behind a backward-facing step, with a permeable reattachment surface Different configurations are tried, the most successful producing a reduction in peak rms pressure fluctuation of about 13% and a reduction in drag of about 9%.
A. Heenan, J. Morrison
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Flow around a semicircular cylinder with passive flow control mechanisms
Experiments in Fluids, 2017Wind tunnel experiments were performed to study the effect of passive flow control strategies on the wake and drag of a semicircular cylinder of infinite aspect ratio. High-resolution planar particle image velocimetry was used to obtain flow statistics around the semicircular cylinder at Reynolds number
A. M. Hamed +3 more
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Using Non-Normality for Passive Laminar Flow Control
2008The scope of this paper was to show how optimal transient growth due to non-normality can be used as an effective amplifier of a passive laminar flow control. Optimal perturbations, usually seen as the most dangerous for transition are here seen as the most effective for control.
C. Cossu +3 more
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Flow Control of Jet Flow by Passive Nozzle Configuration Changes
International Journal of Flow Control, 2009Nozzle configuration may offer the possibility of a passive control technique to provide high mixing and heat transfer rates. Thus, numbers of investigations have been carried out to reveal the influence of nozzle configuration on the flow characteristics. However, very few papers in the scientific literature have focused on orifice jets.
null Shakouchi +4 more
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Sensitivity analysis and passive control of cylinder flow
Journal of Fluid Mechanics, 2008A general theoretical formalism is developed to assess how base-flow modifications may alter the stability properties of flows studied in a global approach of linear stability theory. It also comprises a systematic approach to the passive control of globally unstable flows by the use of small control devices.
Marquet, Olivier +2 more
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Passive Flow Control of Ship Air Wakes
Proceedings of the Vertical Flight Society 69th Annual Forum and Technology Display, 2013Passive flow control of ship air wakes was investigated to determine the impact of a solid, notched fence design and to determine the applicability of using computational fluid dynamics (CFD) and wind tunnel testing to predict changes in ship air wakes.
HyungSuk Kang +2 more
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Passive Flow Control Applied to a NACA23012 Airfoil In A Subsonic Flow
33rd AIAA Applied Aerodynamics Conference, 2015Aerodynamic subsonic flows are an important flow regime for the aeronautical/aerospace industry. Recent studies by the author have shown that the use of an active flow control device, that of a localised asymmetrically located synthetic jet, can significantly improve the aerodynamic performance of bluff and streamlined bodies by altering the three ...
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Square cylinder with passive flow control
2017In the present paper it is presented the flow around a 2D square cylinder which is located downstream of a splitter plate and at a certain distance of it. The fluid velocity below and above the splitter plate is different, several velocity ratios are considered, it is interesting to see that the downstream vortex shedding frequency and amplitude highly
An, Bo +2 more
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Passive feedback control of transonic buffet flow
Physics of Fluids, 2019The activated structural degree of freedom often causes undesirable large-amplitude structural vibrations in unstable flows, such as the frequency lock-in phenomenon in the transonic buffet flow. The underlying mechanism is the instability characteristic of the system that becomes more complex, namely, further instability on the structural mode because
Chuanqiang Gao, Weiwei Zhang, Xintao Li
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The development of passive flow control vortices [PDF]
, 2004 Surface flow visualisation and Particle Image Velocimetry (PIV) were used to investigate the flow-field of sub-boundary layer vane vortex generators (VVGs) and steady jet vortex generators (SJVGs) in a separated flow at 20m/s. The vortex generators were mounted on a 2D bump which was situated on the floor of a 350mm by 250mm wind tunnel and had a ...
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