Lifting Line Theory and Helmholtz theorems

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SUMMARY

The discussion centers on Prandtl's Lifting Line Theory and its relationship with Helmholtz's theorems. It establishes that a change in circulation across a bound vortex filament necessitates the shedding of a vortex sheet of equivalent intensity, which is a direct consequence of Helmholtz's theorem that prohibits circulation variation along a vortex filament. Additionally, Kelvin's theorem reinforces that the net circulation in the entire region must remain zero, further supporting the principles of vortex dynamics.

PREREQUISITES
  • Understanding of Prandtl's Lifting Line Theory
  • Familiarity with Helmholtz's theorems in fluid dynamics
  • Knowledge of vortex dynamics and circulation concepts
  • Basic principles of Kelvin's theorem
NEXT STEPS
  • Study the implications of Helmholtz's theorems on vortex behavior
  • Explore advanced applications of Prandtl's Lifting Line Theory in aerodynamics
  • Investigate the relationship between circulation and vortex shedding
  • Learn about the mathematical formulations of Kelvin's theorem
USEFUL FOR

Aerodynamicists, fluid dynamicists, and engineering students interested in the theoretical foundations of vortex dynamics and their applications in aircraft design.

Nimeo
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I was reasoning about prandtl's lifting line theory. Now, a lot of books state that if the the circulation changes across the bound vortex filament a vortex sheet of the same intensity must be shed from the filament following the wake. Is this a consequence of the helmolzt theorem that forbids any variation in circulation along a vortex filament, or not?
 
Not sure, but it could also be due to Kelvin's theorem so that the net circulation over the entire region remains zero.
 

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