The kochi-muziris biennale is india’s first biennale for contemporary art being held in kochi. one of the festival’s biggest draws is legendary artist anish kapoor‘s ‘descension’, created especially for the event. kapoor — long renowned for his large-scale, invasive sculptural works —
sets visitors within the harrowing space at aspinwall house, fort
kochi, where a caged vortex of black water spins down a seemingly
bottomless hole in the gallery floor. a perpetually rushing whirlpool
churns into the ground, entrancing observers in its continuity, and
creating a spine-chilling atmosphere for those nearby. contained within
the circular gate, ‘descension’ naturally draws visitors to peer as far
down to its depths as they can, but it is kapoor’s masterful play with
boundaries that keeps them constantly intrigued.
Spanish company Vortex Bladeless has developed bladeless turbines, capable of taking advantage of an aerodynamic effect called vorticity, to capture up to 40 percent of the winds total power. Vorticity creates a pattern of spinning vortices, or whirlpools of wind, which in some cases have been known to cause movement in structures like the Tacoma Narrows Bridge
Scientists hope to hugely reduce the cost of wind energy by removing the blades from wind farms, instead taking advantage of a special phenomenon to cause the turbines to violently shake.
Vortex, a startup from Spain, has developed the tall sticks known as Bladeless — white poles jutting out of the ground, that are built so that they can oscillate. They do so as a result of the way that the wind is whipped up around them, using a phenomenon that architects avoid happening to buildings and encouraging it so that the sticks shake.
They do so using vortices, which is where the company gets its name from. The bladeless turbines use special magnets to ensure that the turbines are optimised to shake the most they can, whatever speed the wind is travelling at.
As the sticks vibrate, that movement is converted into electricity by an alternator.
Not all vortex rings are created equal. Despite identical generation mechanisms and Reynolds numbers, the two vortex rings shown above behave very differently. The donut-shaped one, on the top left in green and in the middle row in blue, was formed in a Newtonian fluid, where viscous stress is linearly proportional to deformation. As one would expect, the vortex travels downward and diffuses some as time passes. The mushroom-like vortex ring, on the other hand, is in a viscoelastic fluid, which reacts nonlinearly to deformation. This vortex ring first furls and expands as it travels downward, then stops, contracts, and travels backward! (Image credit: J. Albagnac et al.; via Gallery of Fluid Motion)