Sentences with phrase «vortex rings»

The simulations allow for a detailed study of the evolution of vortex rings as they move through space, and the shape changes that the rings undergo (see image).

Vortex rings present issues in fields such as engineering as they can hamper fluid flow, and, for example, increase the fuel consumption of a car by reducing its aerodynamic efficiency.

As this faster fluid slows down at the fringes, whirls are created that start to develop into stable vortex rings.

In one well - known example of this fact, the Crow Instability causes the vortices to develop symmetric sinusoidal oscillations and eventually to merge and form vortex rings behind the jet.

Modulating the jet flow to create pulsing vortex rings instead lets the vehicle travel 40 percent farther on the same battery charge.

When they swim, they create spinning, doughnut - shaped masses of water called vortex rings, and then they push off these rings almost like a boat pushing off its own wake.

If we compare this in living and non-living systems we find that in non-living systems (e.g., thunderstorms or vortex rings), new examples are generated but the new ones do not exactly reduplicate the old.

For example, the computer model can determine the aspect ratio for which a vortex ring breaks into sub rings, and show how, after encountering a flow of mass against it, the ring is deformed and tilts as it moves further downstream.

«This study not only fills the gap in the current knowledge of the dynamics of an elliptic vortex ring,» says Cheng, «but also addresses the issue of whether an elliptic ring undergoes vortex stretching and compression during axis - switching, which is important for various applications.»

Previously thought too complicated to solve, researchers at Agency for Science, Technology and Research (A * STAR), Singapore, have now developed a computational model to simulate the motion of an elliptical vortex ring in a slow - moving fluid in a range of different situations, allowing for a more realistic description of vortex rings.

As the birds flap their wings downwards, they create a single large air vortex ring behind themselves rather than two small ones.

Not exact matches

Once Hillary Clinton threw her hat into the ring, she immediately became America's presumptive first woman president, creating a kind of reputational vortex that shielded her husband's behavior from scrutiny.

Researchers found that the ring - shaped vortex helps to allocate about 15 percent of the blood flow within the left ventricle in healthy patients; roughly 20 percent in patients with non-ischemic dilated cardiomyopathy; but only about 5 percent for patients with hypertrophic cardiomyopathy.

Engineers at the University of California, San Diego have determined for the first time the impact of a ring - shaped vortex on transporting blood flow in normal and abnormal ventricles within the human heart.

These vortices, or little quantum whirlpools, would break apart and generate sound waves that ran around the ring, like the particles and radiation left over after inflation.

Using intense x-rays generated at Berkeley University's Advanced Light Source, the team captured time - resolved images of whirlpool patterns called magnetic vortices as they gyrated along a nanometer - wide half - ring track.

In addition, the data show that the temperature of the innermost ring imaged by the vortex is around 100 Kelvin (or minus 173 Celsius degrees), a bit warmer than our asteroid belt.

The second vortex study, led by Mawet, presents an image of the innermost of three rings of dusty planet - forming material around the young star called HD 141569 A.

There are some impressive visual effects, particularly the journeys through the swirling vortex of Jupiter's Great Red Spot and a shot of spaceship emerging from the rocky rings of some alien planet.

To give you an idea of what a vortex looks like, it can be the whirlpool in the wake of a boat or even smoke rings.

By Paula Luu, Communications Manager January 24, 2014 While our weather - beaten friends in the Midwest and Northeast braced for near - record low temperatures and polar vortex snowstorms, Californians rang in the New Year with a rainless January.

The third wave form is seen in three dimensions as the propagation torus of a smoke ring and is seen in two dimensions as the double vortexes of an oar stroke on the water.