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Determined to finally create a knotted vortex loop of their very own, physicists at the University of Chicago designed a wing that resembles a delicately twisted ribbon and brought it to life using a 3D printer.
Thrust generation at the end of the upstroke is demonstrated by the formation of reversed vortex loop in the wake of each wing (Johansson et al., 2008; Muijres et al., 2011), and are associated with the optimal wake topology (minimizing the induced drag) at the L/D of these bats (Hall and Hall, 2002), but come at a cost of negative lift (Johansson et al., 2008; Muijres et al., 2011).
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In the case of translating wings the flow structure consists of a chain of interconnected vortex loops and has a strong Strouhal number dependence.
An analysis of the dynamics of these structures for Re=880 reveals a sequence of shed hairpin vortices in combination with a sequence of secondary vortex loops around the legs of the hairpin vortices.
The Hall currents generated by the FACs set up twin-vortex current loops at ionospheric heights, each centering near dawn and dusk.
GIFs can often feel like a visual vortex, an infinite loop of pixelated madness, sucking you closer and closer to your laptop's screen.
Huang et al. (2011) successfully simulated the looping motion observed in Typhoon Krosa (2007) with a fine resolution, realistic topography, although their simulated vortex turned northward after looping, but the observed one moved northwestward.
The particle path, although the particle was much larger than the cut size of the cyclone, exhibited excursions into the inner, upwardly directed, part of the vortex giving rise to recirculatory loops.
Hence, the vortex moves north and forms a loop.
It is noteworthy that the dynamic magnetizations (represented by arrows in Figure 3b) of the PSSW modes form one or more closed loops, each resembling the vortex configuration of a ferromagnetic ring[30].
Similar loops are also generated by vortex F4 in Fig. 5b; and large vortices D2, F2, and F3 in Fig. 5c.
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