A circular von Kármán #vortex street. The video.
This is a lego-motor-powered lazy Susan, spinning and filled to the brim with a #rheoscopic fluid. It's basically dissolved shaving cream with a bit of food coloring. It helps visualizing the flow. 🧪
#fluiddynamics

A von Kármán vortex “flower” using a pencil as an obstacle, and a rotating #rheoscopic solution. This time I used a bit of red food coloring. The fluid oscillation that causes these vortices is an engineering problem because the ensuing vibration, if large, can damage the obstacle. 🧪

A view of the setup to make the vortices. A round platform (i.e. a lazy susan) filled with rheoscopic fluid. A Lego motor drives the platform. The pencil is stationary and held partially submerged by a helping hand device.

[2/4] it is a rotating shallow water #experiment, essentially the lazy Susan is powered by a #LEGO motor, and filled with a #rheoscopic fluid. Here's the setup:

#eddies #flowVisualization #fluidDynamics #fluidsAsArt #physics #diynamics

Top view of a rotating lazy Susan filled with a rheoscopic solution. There is a stationary pencil partially submerged in the shallow water. As the lazy Susan spins with the fluid, the flow past the pencil becomes unstable and creates vortices. The whole pattern of vortices forms a ring.

[1/4] I managed to make a circular von Kármán #vortex street with a lazy Susan table, a #lego motor and #rheoscopic fluid. 🧪
#fluiddynamics