Wolfgang uses a pendulum partially immersed inward a makeshift stream tank to present us the number of vortex shedding on a pocket-size object.
When fluid flows some a cylindrical object, in that place is a arrive at of stream velocities for which a von Karman vortex street is formed. The shedding of these vortices imparts a small, periodic forcefulness on the object. Here the object is a cylinder attached to a physical pendulum whose frequency of oscillation is adjustable. The cease of the cylinder is submerged inward flowing water. When the frequency of the pendulum is adjusted to tally the frequency of vortex shedding, the cylinder swings transverse to the administration of stream amongst a peak-to-peak aAmplitude of a few centimeters.