A simple cylinder in a steady flow creates a beautiful wake pattern known as a von Karman vortex street. The image above shows several examples of this pattern. Flow is from bottom to top, and the Reynolds number is increasing from left to right. In the experiment, this increasing Reynolds number corresponds to increasing the flow velocity because the cylinder size, fluid, and temperature were all fixed. As the Reynolds number first increases, the cylinder begins to shed vortices. The vortices alternate the side of the cylinder from which they are shed as well as alternating in their sense of rotation (clockwise or counterclockwise). Further increasing the Reynolds number increases the complexity of the wake, with more and more vortices being shed. The vortex street is a beautiful example of how fluid behavior is similar across a range of scales from the laboratory to our planet’s atmosphere. (Image credit: Z. Trávníček et. al)
some guy just knocked on my door and said “ben?” last time i checked i am not a ben
he just did it again and i had a moment of self doubt like
maybe i am ben
This is what happens when you synchronize camera’s shutter speed with a helicopter’s blade frequency
sweet dreams are made of bees
who am i to diss a bee
i travel the world and the seven bees
people who exercise in order to get rid of period cramps are the ones surviving the apocalypse.
my textbook and i have a lot in common
do you like money?
ok but consider this
- who cares