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- W2005209095 abstract "Abstract Vortex shedding in the wake of two-dimensional bluff bodies is usually accompanied by three dimensional instabilities. These instabilities result in streamwise and vertical vorticity components which occur at a certain spanwise wavelength. The spanwise wavelength of the instabilities ( λ Z ) depends on several parameters, including profile geometry and Reynolds number. The objective of the present work is to study the three dimensional wake instabilities for a blunt trailing edge profiled body, comprised of an elliptical leading edge and a rectangular trailing edge, and to manipulate these instabilities to control the aerodynamic forces. Results of numerical simulations of flow around the body at Re( d ) = 400, 600, and 1000, as well as planar Laser Induced Fluorescence (LIF) flow visualizations at Re( d ) = 600 and 1000 are analyzed to determine the wake vorticity structure and λ Z . Based on the findings of these analyses, an active flow control mechanism for attenuation of the fluctuating aerodynamic forces on the body is proposed. The flow control mechanism is comprised of a series of trailing edge injection ports distributed across the span, with a spacing equal to λ Z . Injection of a secondary flow leads to amplification of the three dimensional instabilities and disorganization of the von Karman vortex street. Numerical simulations indicate that the flow control mechanism can attenuate the fluctuating aerodynamic forces at lower Reynolds numbers (Re( d ) = 400 and 600) where λ Z is constant in time. However, the control mechanism loses its effectiveness at Re( d ) = 1000, due to the temporal variations of λ Z ." @default.
- W2005209095 created "2016-06-24" @default.
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- W2005209095 date "2010-12-01" @default.
- W2005209095 modified "2023-09-26" @default.
- W2005209095 title "Active flow control for reduction of fluctuating aerodynamic forces of a blunt trailing edge profiled body" @default.
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- W2005209095 doi "https://doi.org/10.1016/j.ijheatfluidflow.2010.05.011" @default.
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