Vortex shedding suppression and aerodynamic characteristics of square cylinder due to offsetting of rectangular cylinders towards a plane

2014 ◽  
Vol 82 ◽  
pp. 91-104 ◽  
Author(s):  
Dilip K. Maiti ◽  
Rajesh Bhatt
Keyword(s):  
Vortex Shedding ◽  
Aerodynamic Characteristics ◽  
Square Cylinder ◽  
Rectangular Cylinders

Effect of rounded corners on two degree of freedom naturally oscillating square cylinder

2017 ◽  
Vol 27 (10) ◽  
pp. 2355-2374 ◽  
Author(s):  
Sajjad Miran ◽  
Chang Hyun Sohn
Keyword(s):  
Vortex Shedding ◽  
Frequency Ratio ◽  
Degrees Of Freedom ◽  
Aerodynamic Characteristics ◽  
Two Dimensions ◽  
Cylinder Wake ◽  
Square Cylinder ◽  
Content Type ◽  
Oscillating Square Cylinder ◽  
Drag And Lift

Purpose The paper aims to study the influence of rounded corners on the flow-induced oscillation of a square cylinder that is free to oscillate in two degrees of freedom. Design/methodology/approach The finite volume code in conjunction with the moving mesh scheme was implemented via a user-defined function to carry out the computations in two dimensions. The Reynolds number (Re) chosen for the present study is fixed at 100, and the frequency ratio, Fr = fs/fn (where fs is the vortex shedding frequency and fn is the natural frequency of cylinder) is used as a varying parameter. The computational model was validated for flow past a stationary cylinder with R/D = 0 and 0.5, and the results showed good agreement with the literature. Findings The aerodynamic characteristics, amplitude response, trajectories of cylinder motion and vortex shedding modes are obtained by conducting a series of simulations under different frequency ratios of the cylinder. It was found that the minimum transverse amplitude, drag force and lift force obtained for a naturally oscillating square cylinder are quite different when compared with a stationary and forced oscillating cylinder, where the maximum drag and lift forces were observed for a square cylinder and a minimum around R/D = 0.2 was observed. Originality/value The present work identified the significant effect of the varying frequency ratio and R/D on the VIV modes of the cylinder. It was observed that the cylinder wake exhibits the (2S) vortex shedding mode for R/D = 0 to 0.2 at all Fr, whereas the C (2S) mode appeared for R/D > 0.2 at Fr = 1.1.

scholarly journals Aerodynamic characteristics of a square cylinder with corner fins

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Qiulei Wang ◽  
Qi Jiang ◽  
Gang Hu ◽  
Xiao Chen ◽  
Chao Li ◽  
...  
Keyword(s):  
Vortex Shedding ◽  
Opposite Effect ◽  
Lift Coefficient ◽  
Underlying Mechanism ◽  
Aerodynamic Characteristics ◽  
Large Eddy Simulations ◽  
Square Cylinder ◽  
Remarkable Effect ◽  
Large Eddy ◽  
Wind Induced Vibration

AbstractThis paper investigates the effect of fitting fins at the corners of a square cylinder on aerodynamic characteristics of the cylinder via wind tunnel tests and large eddy simulations (LES). Although it has been recognized that the corner fins have a remarkable effect on aerodynamic characteristics of a square cylinder, no study has been carried out to systematically evaluate this effect and reveal the underlying mechanism. Three types of corner fin configurations, i.e. fins fitted only to the leading corners, fins fitted only to the trailing corners, and fins fitted to both leading and trailing corners were studied. It was found that the corner fins significantly influence aerodynamic characteristics, such as mean drag coefficient, fluctuating lift coefficient, and vortex shedding of the cylinder. The influences of these corner fin configurations are very different. In general, the leading and trailing fins have an opposite effect on these characteristics. The mechanisms underlying these effects were clarified based on the flow regime visualized via LES. The interesting findings have practical significances not only for reducing aerodynamic forces and wind-induced vibration of infrastructures, but also for enhancing wind-induced vibration-based energy harvesting.

COMPARISON OF LES WITH DSM, k-ε AND EXPERIMENTS FORTURBULENT VORTEX SHEDDING FLOW PAST 2D SQUARE CYLINDER

1994 ◽  
Vol 59 (459) ◽  
pp. 49-56 ◽  
Author(s):  
Shigehiro SAKAMOTO ◽  
Akashi MOCHIDA ◽  
Shuzo MURAKAMI ◽  
Wolfgang RODI
Keyword(s):  
Vortex Shedding ◽  
Square Cylinder ◽  
Flow Past

Computation of Vortex-Shedding Flows Past a Square Cylinder Employing LES and RANS

1998 ◽  
pp. 260-277
Author(s):  
D. Lakehal ◽  
F. Thiele ◽  
L. Duchamp Lageneste ◽  
M. Buffat
Keyword(s):  
Vortex Shedding ◽  
Square Cylinder
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