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The vortex lattice method differs from lifting-line theory principally in that it

  • A.Applies only to two-dimensional sections
  • B.Requires the flow to be viscous
  • C.Distributes vorticity over the wing surface in both chordwise and spanwise directions
  • D.Ignores the trailing vortex system altogether

Answer: C

Lifting-line theory concentrates all the bound vorticity onto a single line, which is only reasonable for a slender, unswept wing. A vortex lattice covers the planform with a grid of horseshoe vortices, so chordwise loading and sweep are represented directly. That makes it usable where lifting-line theory fails.

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