TY - JOUR

T1 - Numerical investigation of the effect of corner radius on forced oscillating square cylinder

AU - Miran, S.

AU - Sohn, C. H.

N1 - Publisher Copyright:
© 2016, Isfahan University of Technology.

PY - 2016

Y1 - 2016

N2 - The purpose of this work is to numerically visualize the flow past forced oscillating square cylinder and investigate the effect of corner radius on flow induced forces. The finite volume code was applied to simulate the two dimensional flow past forced oscillating square cylinder with different radius to diameter ratios, (R/D = 0 referring to a square cylinder with sharp edges and R/D = 0.5 as a circular cylinder). The near wake of a square section cylinder with an increment of R/D = 0.1 was studied as the body undergoes a complete oscillatory cycle at lock-in condition, F = fe/fs = 1 (where fe is the excitation frequency and fs is the vortex shedding frequency for the stationary cylinder). The computational model was validated for flow past oscillating cylinder with R/D = 0.5 at frequency ratios F = 0.5, 1.0 and 1.50, using as the lock-in and lock-out limits and the results shown good agreement. It was observed that computed value of Strouhal Number is nearly same for both stationary and oscillation case and a similar trend was observed, as R/D ratio increases. However, the results obtained from oscillation cylinder cases show the significant increase in root mean square value of lift coefficient (CL, RMS) and mean drag coefficient (CD) as compared to the stationary cylinder. Finally, It was found that the percentage increase of CL, RMS is higher than CD in force oscillating condition for R/D = 0, whereas both values decreases with the increase of R/D.

AB - The purpose of this work is to numerically visualize the flow past forced oscillating square cylinder and investigate the effect of corner radius on flow induced forces. The finite volume code was applied to simulate the two dimensional flow past forced oscillating square cylinder with different radius to diameter ratios, (R/D = 0 referring to a square cylinder with sharp edges and R/D = 0.5 as a circular cylinder). The near wake of a square section cylinder with an increment of R/D = 0.1 was studied as the body undergoes a complete oscillatory cycle at lock-in condition, F = fe/fs = 1 (where fe is the excitation frequency and fs is the vortex shedding frequency for the stationary cylinder). The computational model was validated for flow past oscillating cylinder with R/D = 0.5 at frequency ratios F = 0.5, 1.0 and 1.50, using as the lock-in and lock-out limits and the results shown good agreement. It was observed that computed value of Strouhal Number is nearly same for both stationary and oscillation case and a similar trend was observed, as R/D ratio increases. However, the results obtained from oscillation cylinder cases show the significant increase in root mean square value of lift coefficient (CL, RMS) and mean drag coefficient (CD) as compared to the stationary cylinder. Finally, It was found that the percentage increase of CL, RMS is higher than CD in force oscillating condition for R/D = 0, whereas both values decreases with the increase of R/D.

KW - Drag and lift coefficient

KW - Rounded corners

KW - Transverse oscillation

KW - Vortex shedding

UR - http://www.scopus.com/inward/record.url?scp=85032273679&partnerID=8YFLogxK

U2 - 10.29252/jafm.09.06.26216

DO - 10.29252/jafm.09.06.26216

M3 - Article

AN - SCOPUS:85032273679

SN - 1735-3572

VL - 9

SP - 3013

EP - 3022

JO - Journal of Applied Fluid Mechanics

JF - Journal of Applied Fluid Mechanics

IS - 6

ER -