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Rayleigh-Benard-convection in two dimensions
Simulation of twodimensional Rayleigh-Benard-convection. A fluid of initially uniform temperature is heated from below and cooled from above.
The temperature is color-coded; the color transition black-red-orange-yellow-white corresponds to a transition from cold to hot fluid.
This simulation shows 2D Rayleigh-Benard convection in which a fluid of uniform initial temperature is heated from below and cooled from above. This is roughly analogous to the situation of placing a pot of water on a hot stovetop. (In the case of the water on the stove, the upper boundary is the water-air interface, while, in the simulation, the upper boundary is modeled as a no-slip (i.e. solid) interface.) The simulation shows contours of temperature (black = cool, white = hot). In general, the hot fluid rises and the cold fluid sinks due to differences in density, but, as the simulation shows, the actual mixing that occurs is far more complex than that simple axiom indicates.
Proof that science is better than LSD.
(Source: youtube.com, via skeptv)
NASA SDO - Large Flare and Coronal Mass Ejection
The Sun unleashed a large X class (strongest category) flare late on Sept. 7 and into early Sept. 8, 2011. The images were taken in extreme ultraviolet (UV) light from SDO. The video clip presents the flash of the flare and a mass of ejecta that rose above the Sun, some of which fell back to the surface. However, other instruments from SOHO and STEREO showed a large mass of particles rushing out into space. Flares emit a great deal of radiation, but this is not captured in this wavelength of light. The brightness of this flare caused very bright saturation and ‘blooming’ above and below the flare region on the CCD detector and caused extended diffraction patterns to spread out.
Credit: NASA SDO
We’re all gonna die D:
(Source: youtube.com, via skeptv)
