vortex-streets

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These images from Earth Observatory show islands creating ’von Karman vortices’ in the stratocumulus clouds. In the animation you can see that each vortex is formed from alternating sides of the object that is impeding flow of the fluid such as clouds or soap films.

In the first image, the water droplets in the clouds create an optical phenomena known as Glory, making the rainbow to the left. However, this is different from a rainbow, in that it is formed from backwards diffraction meaning they are always directly opposite to the Sun.

Another entry in the Princeton 2011 Art of Science competition.

“For this image, two artificial fish fins are placed side-by-side and flapped in-phase with each another as water flows past the fins (flow direction is up). Small hydrogen bubbles (the white part of the image) allow for the wake of the fins to be visualized. The interaction of the fins creates two repeating patterns of swirling vortices known as vortex streets.”

Von Karman Vortices Off Chile

Two small islands had a big impact on the skies over the Pacific Ocean in January 2013, creating paisley patterns that stretched 280 kilometers (175 miles). The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image on January 13, 2013.

The Juan Fernandez Islands are located roughly 800 kilometers (500 miles) off the Chilean coast. The biggest of these—Isla Alejandro (Alexander) Selkirk and Isla Robinson Crusoe—are volcanic islands situated along an east-west-trending submarine ridge. Each island boasts a tall summit. With an area of 52 square kilometers (20 square miles), Isla Alejandro Selkirk reaches an altitude of 1,650 meters (5,413 feet) above sea level. Slightly smaller, Isla Robinson Crusoe has a total area of 48 square kilometers (19 square miles), and reaches an altitude of 922 meters (3,025 feet).

The islands are tall enough to disturb air flow over the ocean. When an object such as an island interferes with the movement of air, von Karman vortices form in the air on the downwind (or leeward) side of the island. Also known as vortex streets, they are double rows of spiral eddies that are made visible by the clouds.

Vortex bladeless turbines wobble to generate energy

Vortex bladeless turbines wobble to generate energy #windturbine #Vortexbladelessturbines #bladelesswindturbine

Groups of Vortex units can be placed close together as the disruption of the wind stream is not as critical to operation as it is for traditional, blade-driven wind turbines (Credit: Vortex)

Up to 80 percent more cost effective to maintain –  supposedly has a greater than 50 percent manufacturing cost advantage and a 40 percent reduction in its carbon footprint compared to standard wind turbines

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As Ultra Street Fighter IV launches on PS4 today, I went back and did some math to see exactly how much I spent on the whole SFIV series.
Rough estimates, mind you.

$10 - Rented Vanilla SFIV from Blockbuster

$60 - Bought Vanilla for my Dad’s PS3

$40 - Bought Vanilla for my own 360

$40 - Bought Super Street Fighter IV for 360

$15 - Bought Arcade Edition upgrade for 360

$40 - Bought Arcade Edition for PC

$15 - Bought Ultra upgrade for PC

And finally

$25 - Ultra for PS4


All coming to a grand total of roughly $245.

I am trapped in the Street Fighter vortex and there is probably no escaping it.

[ Authors ]
Manuel Jung, Tobias F. Illenseer, Wolfgang J. Duschl
[ Abstract ]
The importance of contact discontinuities in 2D isothermal flows has rarely been discussed, since most Riemann solvers are derived for 1D Euler equations. We present a new contact resolving approximate Riemann solver for the isothermal Euler equations and show its performance for several one- and two-dimensional test problems. The new solver extends the well-known HLL solver, while retaining its computational simplicity. The significant gain in resolution of vortices is displayed by a simulation of the K'arm'an vortex street. We discuss the loss of Galilean invariance and its implications for the resolution of contact discontinuities, which is experienced by all modern numerical schemes for hydrodynamics in non-moving grids.