Modification of three-dimensional instability in the planar shear flow around two circular cylinders in tandem

2019 ◽  
Vol 31 (10) ◽  
pp. 104110 ◽  
Keyword(s):  
Shear Flow ◽  
Three Dimensional ◽  
Circular Cylinders ◽  
Planar Shear ◽  
Dimensional Instability

Three Dimensional Wake Structure of Free Planar Shear Flow Around Horizontal Cylinder

2006 ◽  
pp. 669-676
Author(s):  
Marcelo A. Vitola ◽  
Edith Beatriz Camano Schettini ◽  
Jorge Hugo Silvestrini
Keyword(s):  
Shear Flow ◽  
Three Dimensional ◽  
Horizontal Cylinder ◽  
Wake Structure ◽  
Planar Shear

Dynamic responses and flow-induced vibration mechanism of three tandem circular cylinders in planar shear flow

2020 ◽  
Vol 199 ◽  
pp. 107022
Author(s):  
Jiahuang Tu ◽  
Xiaoling Tan ◽  
Xuhui Deng ◽  
Zhaolong Han ◽  
Min Zhang ◽  
...  
Keyword(s):  
Shear Flow ◽  
Dynamic Responses ◽  
Circular Cylinders ◽  
Flow Induced Vibration ◽  
Planar Shear ◽  
Vibration Mechanism

An Experimental Investigation of Staggered Circular Cylinders in a Uniform Planar Shear Flow

2002 ◽  
Author(s):  
O. O. Akosile ◽  
D. Sumner
Keyword(s):  
Shear Flow ◽  
Strouhal Number ◽  
Vortex Shedding ◽  
Bluff Body ◽  
Incidence Angle ◽  
Lift Coefficient ◽  
Circular Cylinders ◽  
Aerodynamic Forces ◽  
Planar Shear ◽  
Critical Incidence

Two circular cylinders of equal diameter, arranged in staggered configurations of P/D = 1.125 and 1.25, were immersed in a uniform planar shear flow, at Re = 5.0×104 and a dimensionless shear parameter of K = 0.05. The mean aerodynamic forces and the vortex shedding frequencies were measured for the upstream and downstream cylinders at each P/D. Under uniform, no-shear flow conditions, K = 0, the flow field of the cylinder group is similar to a single bluff body. As the incidence angle is varied from α = 0° to 90°, the forces on each cylinder undergo discontinuous changes, or attain local minimum or maximum values, at several critical incidence angles. At small α, the Strouhal number is greater than that of a single, isolated circular cylinder, whereas at high α the Strouhal number is lower than the single-cylinder value. The effects of shear, K = 0.05, on the aerodynamic forces were different depending on whether the downstream cylinder was situated at a higher or lower centreline velocity compared to the upstream cylinder. The planar shear flow had its greatest influence when the cylinders were in a nearly side-by-side arrangement. This indicated that the effect of shear was mostly on the flow through the gap between the cylinders. The lift coefficient data were mostly unchanged by the shear flow, the drag coefficient data were lowered, and there were shifts in the critical incidence angles. The influence of shear on vortex shedding was less pronounced, but there was a small reduction in Strouhal number compared to the no-shear case.

Simulation of Planar Shear Flow Passing Two Equal-Sized Circular Cylinders in Tandem Arrangement

2011 ◽  
Author(s):  
Keivan Fallah ◽  
Abas Ali Fardad ◽  
Ehsan Fattahi ◽  
Nima Sedaghati Zadeh ◽  
Muhammed Hasan Aslan ◽  
...  
Keyword(s):  
Shear Flow ◽  
Circular Cylinders ◽  
Tandem Arrangement ◽  
Planar Shear
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