LOCK-ON OF VORTEX SHEDDING DUE TO ROTATIONAL OSCILLATIONS OF A FLAT PLATE IN A UNIFORM STREAM

1998 ◽  
Vol 12 (6) ◽  
pp. 779-798 ◽  
Author(s):  
J.M. CHEN ◽  
Y.-C. FANG
Keyword(s):  
Flat Plate ◽  
Vortex Shedding ◽  
Rotational Oscillations ◽  
Uniform Stream

Vortex Shedding Analysis in the Wake of a Flat Plate at Low Incidence and Low Reynolds Number

2021 ◽  
Author(s):  
Bastav Borah ◽  
Anand Verma ◽  
Vinayak Kulkarni ◽  
Ujjwal K. Saha
Keyword(s):  
Reynolds Number ◽  
Velocity Field ◽  
Flat Plate ◽  
Vortex Shedding ◽  
Low Reynolds Number ◽  
General Tendency ◽  
Flat Plates ◽  
Trailing Edge ◽  
Low Reynolds ◽  
Low Incidence

Abstract Vortex shedding phenomenon leads to a number of different features such as flow induced vibrations, fluid mixing, heat transfer and noise generation. With respect to aerodynamic application, the intensity of vortex shedding and the size of vortices play an essential role in the generation of lift and drag forces on an airfoil. The flat plates are known to have a better lift-to-drag ratio than conventional airfoils at low Reynolds number (Re). A better understanding of the shedding behavior will help aerodynamicists to implement flat plates at low Re specific applications such as fixed-wing micro air vehicle (MAV). In the present study, the shedding of vortices in the wake of a flat plate at low incidence has been studied experimentally in a low-speed subsonic wind tunnel at a Re of 5 × 104. The velocity field in the wake of the plate is measured using a hot wire anemometer. These measurements are taken at specific points in the wake across the flow direction and above the suction side of the flat plate. The velocity field is found to oscillate with one dominant frequency of fluctuation. The Strouhal number (St), calculated from this frequency, is computed for different angles of attack (AoA). The shedding frequency of vortices from the trailing edge of the flat plate has a general tendency to increase with AoA. In this paper, the generation and subsequent shedding of leading edge and trailing edge vortices in the wake of a flat plate are discussed.

Feedback control of vortex shedding from an inclined flat plate

2010 ◽  
Vol 25 (1-4) ◽  
pp. 221-232 ◽  
Author(s):  
Won Tae Joe ◽  
Tim Colonius ◽  
Douglas G. MacMynowski
Keyword(s):  
Feedback Control ◽  
Flat Plate ◽  
Vortex Shedding

Noise Radiated by Flow Impingement on a Flat Plate Using DNS with a Virtual Boundary Method

2005 ◽  
Vol 4 (1-2) ◽  
pp. 117-134 ◽  
Author(s):  
F. Margnat ◽  
V. Morinière ◽  
Y. Gervais
Keyword(s):  
Flat Plate ◽  
Vortex Shedding ◽  
Leading Edge ◽  
Uniform Grid ◽  
Far Field ◽  
Sound Emission ◽  
Maximum Value ◽  
Boundary Method ◽  
Hydrodynamic Field ◽  
Virtual Boundary

Uniform flow impinging on the rectangular leading edge of a flat plate is simulated using an incompressible, two-dimensional direct numerical simulation with uniform grid, the solid surface being modelled by the virtual boundary method previously developed by Goldstein et al. Access is given to the hydrodynamic field at a Reynolds number of 500, which shows the separation at the edge, the development of a double recirculating bubble, a periodic vortex-shedding, and the generation of a boundary layer profile after the re-attachment point. Curle's analogy is then applied to evaluate the sound emission in the far field. Results are given in terms of far field pressure levels directivity and pressure spectra associated with surfacic or volumic sources. The emission from the surfacic sources reaches its maximum value in the direction perpendicular to the plate and acoustic frequencies tend to follow the main wall pressure frequencies of the flow, while the emission from the volumic sources exhibits a shear noise behaviour and acoustic frequencies seem to be the double of the main velocity frequencies.

DSMC Calculation for Vortex Shedding behind an Inclined Flat Plate

2003 ◽  
Vol 2003.52 (0) ◽  
pp. 1-2
Author(s):  
Keisuke MIZUGUCHI ◽  
Masaru USAMI
Keyword(s):  
Flat Plate ◽  
Vortex Shedding
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