Vortex dynamics in a wire-disturbed cylinder wake
نویسندگان
چکیده
منابع مشابه
Longitudinal vortex structures in a cylinder wake
Recently, flow visualizations by Wei and Smith,’ Williamson,’ Welsh et a1.,3 and Bays-Muchmore and Ahmed4 have shown that three-dimensional (3-D) vertical structures develop in the wake of a bluff body. The 3-D vertical structures were found to include pairs of counterrotating longitudinal vortices superimposed on the nominally two-dimensional (2-D) Kirmin vortex street as speculated by Grant’ ...
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Spatially periodic rows of point vortices in a 2-dimensional ideal fluid have long attracted the attention of fluid dynamicists, one of the earliest and the most popular instances being Kármán’s vortex street [6], [15, photos 94–98]. The general problem is as follows: analyse the motion of an infinite configuration consisting of vortices z1, . . . , zN ∈ C with vorticities Γ1, . . . ,ΓN ∈ R tog...
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The three-dimensionality of the velocity field in the wake of a circular cylinder has excited considerable interest and debate over the past decade. Presented here are experimental results that characterize the underlying vorticity field of such wakes. Using particle image velocimetry (PIV), instantaneous velocity fields were measured and from these the vorticity of the longitudinal vortices ly...
متن کاملInstabilities in the Wake of a Circular Cylinder with Near-wake Wire Disturbances
The secondary instabilities in the wake of a circular cylinder with near-wake wire disturbances are investigated by using threedimensional (3D) direct numerical simulations (DNS). For one wire placed asymmetrical about the wake centreline and two wires placed symmetrical about the wake centreline, the secondary instabilities are found to be Mode C and Mode A, respectively. The existence of the ...
متن کاملExperimental Investigation of wake on an elliptic cylinder in the presence of tripping wire
In this research, the behavior and characteristics of the wake of flow in an elliptic cylinder with zero angle of attack in the presence of a tripping wire were investigated experimentally. For this purpose, the used an Aluminum cylinder with an elliptical cross section of the major and minor axis of 42.4 mm and 21.2 mm, respectively, and of the height of 390 mm. The cylinder model was examined...
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2010
ISSN: 1070-6631,1089-7666
DOI: 10.1063/1.3466659