Studies of two-dimensional vortex streets

2001 ◽  
Author(s):  
Kamran Mohseni
Keyword(s):  
Two Dimensional ◽  
Vortex Streets

scholarly journals Experiments on quasi-two-dimensional dipolar vortex streets generated by a moving momentum source in a stratified fluid

2011 ◽  
Vol 60 (2) ◽  
pp. 024702
Author(s):  
Zhu Min-Hui ◽  
Wang Xiao-Qing ◽  
Chen Ke ◽  
You Yun-Xiang ◽  
Hu Tian-Qun
Keyword(s):  
Stratified Fluid ◽  
Two Dimensional ◽  
Vortex Streets

Secondary vortex streets in two-dimensional cylinder wakes

1999 ◽  
Vol 25 (1) ◽  
pp. 1-18 ◽  
Author(s):  
Osamu Inoue ◽  
Teruyuki Yamazaki
Keyword(s):  
Secondary Vortex ◽  
Two Dimensional ◽  
Vortex Streets ◽  
Cylinder Wakes

scholarly journals Non-stationary vortex streets in shear flows

2019 ◽  
Vol 55 (6) ◽  
pp. 127-138
Author(s):  
М. V. Кalashnik ◽  
О. G. Chkhetiani
Keyword(s):  
Shear Flows ◽  
Vortex Street ◽  
Two Dimensional ◽  
Free Shear Layer ◽  
Horizontal Shear ◽  
Vortex Streets ◽  
Stationary Vortex ◽  
Spatially Periodic ◽  
Current Lines ◽  
Vorticity Transport

Spatially periodic vortex systems that form due to unstable shear flows are called vortex streets. A number of exact and asymptotic solutions of two-dimensional hydrodynamic equations describing nonstationary vortex streets have been constructed. It is shown that the superposition of the flow with a constant horizontal shear and its perturbations in the form of a nonmodal wave provides an exact solution that describes a nonstationary vortex street with rotating elliptic current lines. The width of the zone occupied by such a vortex street has been determined. The equation of separatrix separating vortex cells with closed current lines from an external meandering flow has been obtained. The influence of the quasi-two-dimensional compressibility and beta effect on the dynamics of vortex streets has been studied based on the potential vorticity transport equation. The solutions describing the formation of vortex streets during the development of an unstable zonal periodic flow and a free shear layer have been constructed using a longwave approximation.

scholarly journals Separated rows structure of vortex streets behind triangular objects

2019 ◽  
Vol 862 ◽  
pp. 216-226
Author(s):  
Ildoo Kim
Keyword(s):  
Boundary Layer ◽  
Thin Layer ◽  
Boundary Layers ◽  
Experimental Studies ◽  
Soap Film ◽  
Separation Distance ◽  
Two Dimensional ◽  
Spatial Structures ◽  
Physical Mechanisms ◽  
Vortex Streets

We discuss two distinct spatial structures of vortex streets. The ‘conventional mushroom’ structure is commonly discussed in many experimental studies, and the exotic ‘separated rows’ structure is characterized by a thin layer of irrotational fluid between two rows of vortices. In a two-dimensional soap film channel, we generate the exotic vortex arrangement by using triangular objects. This setting allows us to vary the thickness of boundary layers and their separation distance independently. We find that the separated rows structure appears only when the boundary layer is thinner than 40 % of the separation distance. We also discuss two physical mechanisms of the breakdown of vortex structures. The conventional mushroom structure decays due to the mixing, and the separated rows structure decays because its arrangement is hydrodynamically unstable.

scholarly journals The linear two-dimensional stability of inviscid vortex streets of finite-cored vortices

1984 ◽  
Vol 147 (-1) ◽  
pp. 187 ◽  
Author(s):  
D. I. Meiron ◽  
P. G. Saffman ◽  
J. C. Saffman
Keyword(s):  
Dimensional Stability ◽  
Two Dimensional ◽  
Vortex Streets

The formation of vortex streets

1962 ◽  
Vol 13 (1) ◽  
pp. 1-20 ◽  
Author(s):  
Frederick H. Abernathy ◽  
Richard E. Kronauer
Keyword(s):  
Incompressible Fluid ◽  
Vortex Street ◽  
Bluff Bodies ◽  
Two Dimensional ◽  
Vortex Sheets ◽  
Linear Interaction ◽  
Inviscid Incompressible Fluid ◽  
Fixed Distance ◽  
Vortex Streets ◽  
Non Linear

The formation of vortex streets in the wake of two-dimensional bluff bodies can be explained by considering the non-linear interaction of two infinite vortex sheets, initially a fixed distance, h, apart, in an inviscid incompressible fluid. The interaction of such sheets (represented in the calculation by rows of point-vortices) is examined in detail for various ratios of h to the wavelength, a, of the initial disturbance. The number and strength of the concentrated regions of vorticity formed in the interaction depend very strongly on h/a. The non-linear interaction of the two vortex sheets explains both the cancellation of vorticity and vortex-street broadening observed in the wakes of bluff bodies.

scholarly journals Vortex Streets on a Sphere

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Ghada Alobaidi ◽  
Roland Mallier
Keyword(s):  
Spherical Surface ◽  
Two Dimensional ◽  
Vortex Streets

We consider flows on a spherical surface and use a transformation to transport some well-known periodic two-dimensional vortex streets to that spherical surface to arrive at some new expressions for vortex streets on a sphere.

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