Results 251 to 260 of about 2,971,967 (301)
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Evolving strategies for active flow control
Proceedings of the 2000 Congress on Evolutionary Computation. CEC00 (Cat. No.00TH8512), 2002Rechenberg and Schwefel (Rechenberg, 1994) came up with the idea of evolution strategies for flow optimization. Since then advances in computer architectures and numerical algorithms have greatly decreased computational costs of realistic flow simulations, and today computational fluid dynamics (CFD) is complementing flow experiments as a key guiding ...
Michele Milano +3 more
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Active Control Of Flow-induced Vibration
Journal of Sound and Vibration, 1993Abstract The active control of flow-induced oscillations, specifically, vortex-induced oscillations of circular cylinders and galloping oscillations of circular cylinders and galloping oscillations of a square prism, are considered. In the case of vortex-induced oscillations, the vibrating cylinder is modeled as a single-degree-of-freedom (sdof ...
Venkatraman, K., Narayanan, S.
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Current study on active flow control and passive flow control
Theoretical and Natural Science, 2023Flow control is a very important research direction in the field of fluid dynamics and one of the important research difficulties in the field of aerospace in the 21st century. This study aims to explore the principles and applications of active flow control and passive flow control, and analyze their practical applications in different fields.
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Electrohydrodynamic flow for the active control of gas flows
Uspekhi Fizicheskih Nauk, 2017Abstract A new approach to producing powerful electrohydrodynamic flows in a gas environment is discussed, in which a barrier discharge distributed over a dielectric surface is used as an intense ion source. Electric discharge systems for active control of gas flows with a high (> 15 l s−1) volumetric rate are developed and ...
V Yu Khomich, V A Yamshchikov
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Flow Response of Active Flow Control Actuators
AIAA Journal, 2014Numerical and experimental analysis of a synthetic jet actuator in quiescent air is reported. The study focuses on the actuator itself and on the vorticity field as well as on structures that are generated by the actuator. Large eddies simulation was used for numerical analysis and phase-locked, two-dimensional microscopic-particle image velocimetry ...
Eran Arad +2 more
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Journal of Sound and Vibration, 2001
This paper considers the two-dimensional problem of a plane vortex sheet disturbed by an impulsive line source. A previous incorrect treatment of this problem is examined in detail. Instabilities of the vortex sheet are triggered by the source and grow exponentially in space and time.
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This paper considers the two-dimensional problem of a plane vortex sheet disturbed by an impulsive line source. A previous incorrect treatment of this problem is examined in detail. Instabilities of the vortex sheet are triggered by the source and grow exponentially in space and time.
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Flow control with active dimples
The Aeronautical Journal, 2007AbstractThe long-term goal is to design and manufacture optimal ‘on-demand’ vortex generators, ‘dimples’ that can produce vortices of prescribed strength and duration for the real-time control of aerodynamic flows that are either undergoing transition or are fully turbulent, attached or separating.
S. Dearing, S. Lambert, J. Morrison
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Active Control of Separated Flow
2022The performance of many objects is primarily dictated by the flow of surrounding air or water. For example, most of vehicle fuel usage is required to overcome aerodynamic drag. Conversely, the energy in flowing fluids can be harnessed as a renewable energy source.
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Actuators for Active Flow Control
Annual Review of Fluid Mechanics, 2011Actuators are transducers that convert an electrical signal to a desired physical quantity. Active flow control actuators modify a flow by providing an electronically controllable disturbance. The field of active flow control has witnessed explosive growth in the variety of actuators, which is a testament to both the importance and challenges ...
Louis N. Cattafesta, Mark Sheplak
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Active Flow Control of Wing Separated Flow
Volume 1: Fora, Parts A, B, C, and D, 2003Numerical investigations of active flow control, which can offer significant improvements to wind–turbine rotor and turbomachinery performance by suppressing detrimental effects of separated flow, are presented. Simulations of pulsating jet flow control applied on wings at low speed, high Reynolds number turbulent flow and fixed angles of incidence are
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