Now this is pretty awesome. Watch the patterns in the fog behind that building (viewed from the John Hancock Center, Chicago). You can make out a swirling, alternating vortex pattern. The fog is defining a Von Karman vortex pattern.
Flounders, stingrays, and other flat, bottom-dwelling fish often hide under sand for protection. These fish move by oscillating their fins or the edge of their bodies. They use a similar mechanism to bury themselves–quickly flapping to resuspend a cloud of particles, then hitting the ground so that the sand settles down to cover them. Researchers have been investigating this process by oscillating rigid and flexible plates and observing the resulting flow. When the flapping motion exceeds a critical velocity, the vortex that forms at the plate’s edge is strong enough to pick up sand particles. Understanding and controlling how and when these vortex motions kick up particles is useful beyond the ocean floor, too. Helicopters are often unable to land safely in sandy environments because of the particles their rotors lift up, and this work could help mitigate that problem. (Image credits: TylersAquariums, source; Richmondreefer, source; A. Sauret, source; research credit: A. Sauret et al.)
How does an aircraft fly?
Think of it like this, due to the design of the wing, larger number of
air molecules are hitting the bottom portion of the aircraft than the
As a result, a upward force acts on the wing, hence the wing lifts!
This works fine till we get to the wing tips.
the wingtip, the air from a higher pressure wants to move to the region
of lower pressure. And as a result, this forms vortices ( fancy name
for the swirling motion of air ) known as Wingtip Vortex. ( because its
formed in the wing tips!!! )
And it is due to the ramification of this, that we obtain those gorgeous smoke angels. Pretty cool huh ?
Composed of more than 20,000 Chinese characters, these intricate
sculptures by Zheng Lu are soft and seamless in appearance despite their
stainless steel make-up. The characters used are all chosen from Chinese
texts and poems. For example, the sculpture that looks like a splash of
water is cunningly crafted from the lines of the poem Wan Zhi Shui
(Playing With Water) written by the Tang Dynasty poet Bai Juyi. This
playfulness with details can be seen throughout Lu’s work. When
discussing the use of one of the most original Chinese fonts in a
specific piece, he said, “You would not figure that out from a distant
view. Otherwise, it would not be fun.”
The contemporary Chinese
sculptor has been interested in calligraphy for a long time. He grew up
in a literary family with a strong traditional Chinese intellectual
background and his father made him take up the practice of calligraphy
when he was still very young. This skill is now apparent in much of his
artwork and the inclusion of meaningful text brings a unique aesthetic
and significance to Lu’s already elegant sculptures. Txt Via MMM