Structure of Karman vortex shedding from a yawed cylinder in a uniform flow.

Visualization of three-dimensional flow structures in the wake of an inclined circular cylinder

“…It is reported that the correlation length of a large scale vortex in the spanwise direction, which is one of factors in evaluating a scale of the flow structure, plays an important role for analyzing the aerodynamic noise (Iida, et al, 1995, Kato, et al, 1994. Moreover, Shirakashi et al (1986) have experimentally investigated the structure of Karman's vortex shedding from a yawed cylinder in a uniform flow, and reported that a secondary flows along the axis of the cylinder lead to the reductions in the frequency and the regularity of the vortex shedding as the inclined angle increases.…”

Preliminary Review Analysis of Distributed Sensors for Versatile Test Reactor (VTR) Environment

“…When the angle between the flow direction and the axis of the rod is less than 90 degrees (90 degrees corresponds to the conventional Karman vortex), which is similar to the case for placing the rod in a pipe flow with an impinging jet coming from the side of the pipe, it is known that a secondary flow along the rod is formed (see Figure 26). This secondary flow affects the formation of Karman vortices, reducing the regularity found in the conventional Karman vortices [Shirakashi 1986]. It should be noted that, unlike the case where the rod is installed in parallel to the fluid flow, for the case that the jet hits the rod at an angle less than 90 degrees, the vortices formed downstream of the rod will eventually dissipate away.…”

The Design and Experimental Study of a Double-Column Scrambler Wind–Sand Separator for Sustainable Soil Wind Erosion Monitoring

“…Moreover, researchers have undertaken in-depth examinations of inclined circular column flows to elucidate the impact of the inclination angle on wake structures, cylinder force characteristics, and axial flow properties [15,16]. Through wind tunnel experiments, Shirakasi et al [17] observed vortical motion along the axis of inclined circular column wakes, highlighting that the shedding frequency of vortices decreases with an increase in the inclination angle α, leading to a more irregular vortex street in the wake (where α represents the inclination angle of the column perpendicular to the incoming flow, set at 90 • ). Hogan and Hall [18] further stipulated that, with higher cylinder inclination angles, the presence of three-dimensional turbulence within the flow field becomes more prominent, ultimately culminating in a more chaotic and disorderly detachment of vortices within the primary wake region.…”