Talk:Boundary Layer Separation

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"An example of this is the Tacoma Narrows Bridge. The shedding vortices reached the resonance frequency of the bridge and ultimately caused it to collapse"

TACOMA bridge failure IS NOT due to a resonance but to a flutter phenomenon: see "Tacoma Narrows Bridge" on Wikipedia:

"The bridge's spectacular self-destruction is often used as an object lesson in the necessity to consider both aerodynamics and resonance effects in civil and structural engineering. However the effect that caused the destruction of the bridge should not be confused with forced resonance (as from the periodic motion induced by a group of soldiers marching in step across a bridge).[8] In the case of the Tacoma Narrows Bridge, there was no periodic disturbance. The wind was steady at 42 mph (67 km/h). The frequency of the destructive mode, 0.2 Hz, was neither a natural mode of the isolated structure nor the frequency of blunt-body vortex shedding of the bridge at that wind speed. The event can only be understood while considering the coupled aerodynamic and structural system which requires rigorous mathematical analysis to reveal all the degrees of freedom of the particular structure and the set of design loads imposed"