One of these named for Rankine consists of a free one surrounding a forced one.
The frequency of creation of these entities from a long circular cylinder is governed by the Strouhal number. One of these named for Rankine consists of a free one surrounding a forced one. Van Karman names a process of shedding of so-called streets of these - one instance of that process created the resonant force that destroyed the Tacoma Narrows Bridge. They are similar to eddies except they contain no voids in their centers. Usually occurring in regions where the circulation per unit area is non-zero, for 10 points, identify these entities found in fluids; local regions of circulatory flow exemplified by cyclones and tornadoes.
The frequency of creation of these entities from a long circular cylinder is governed by the Strouhal number.
{vortex} [or {vortices}]