Discussion
Helmholtz's vortex theorems require that a vortex filament
Answer: D
Helmholtz showed that the strength of a vortex filament is constant along its length and that the filament cannot simply stop in the fluid. This is precisely why the bound vortex on a wing must continue as trailing vortices and close through the starting vortex, giving the closed vortex system that lifting-line theory assumes.
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