vortex ring (size, velocity, vorticity), as well as the presence of a trailing jet, depend on the piston velocity profile and on the piston stroke ratio (fluid length to nozzle diameter, L/D). In some cases, a single ring with no trailing jet will form, in other cases the ring will...
We show that in the limit ε→0, when the density of vorticity becomes very large, the movement of each vortex ring converges to a simple translation, at least for a small but positive time.This is a preview of subscription content, log in via an institution to check access. ...
The rebound of the trailing vortices can be explained by the interaction with secondary vortices. Prompted by the study of Harvey and Perry (1971), Boldes and Ferreri (1973) investigated a flow field in which a vortex ring impinged on a flat plate. They confirmed the formation of a ...
"It was a Wirbelrohr, he explained; you blew into the stem, and out one end of the cross-tube flowed hot air, while cold air flowed out the other. I laughed; I was certain he was teasing me. Although I had never heard of a Wirbelrohr, I recognised a Maxwell demon when it was...
pattern that develops in the presence of floor and wall interactions in hovering or slow flight includes a large-diameter vortex ring trapped underneath the animal; this vortex ring is conjectured to be analogous to that below a helicopter in slow descending flight in the `vortex ring state'. ...
The existence of quantized vortex rings was conjectured by Feynman 1 in his discussion of superfluid helium, but it was not until several years later that Rayfield and Reif 2 first identified a charged vortex ring in He II. Since then many experiments dealing with the individual properties of...
the total density is circularly symmetric and one has to study correlation functions—just as explained above for the case of Wigner localization.Figure 22shows the electron–electron pair correlation for 36 electrons at a highlyrotational state. Clearly, in addition to the exchange-correlation hole ...
This means that they use O-ring seals that not only prevents water, but all moisture and dust from entering the system that can completely ruin the instrument. Fogproof As well as this, the air inside the chassis is replaced with Argon gas which is completely moistureless and thus inhibits...
(WSM Morph based, Eq.5). The overall computational time to obtain the TPF morph-based optimum design is reduced tenfold compared to the WSM. This reduction in computational time can be explained by the reduction of the design space of the exploration represented schematically by the two ...
Consequently, the direction can only be changed by possible interactions with other agents or with the boundaries, as explained below. The pedestrian interaction is modelled using a long-range and a short-range repulsion term. The former attempts to qualitatively reproduce the phenomenon of social ...