Object-oriented unsteady vortex lattice method for flapping flight

By L. Long, T. Fritz. 2004

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Applications of the unsteady vortex-lattice method in aircraft aeroelasticity and flight dynamics (2012, background): “Hence, while the DLM has dominated in fixed-wing aircraft aeroelasticity, the UVLM has been gaining ground in situations where free-wake methods become a necessity because of geometric complexity, such as flapping-wing kinematics [69–71], rotorcraft [72, 73], or wind turbines [74–80].”
Structural and Aerodynamic Models in Nonlinear Flight Dynamics of Very Flexible Aircraft (2010, background): “The circulation strength of the wake rings remains constant as they are moved away from the lifting surface, and they are allowed to roll up and stretch; albeit dissipation could also be accounted for by implementing any of various models for wake decay [26,27], this was not regarded as necessary fo”
Analytical Sensitivity Analysis of an Unsteady Vortex Lattice Method for Flapping Wing Optimization (2009, methodology): “where A1 and A2 serve a similar purpose to that above: the former preserves the strength of thewake computed in the previous time step as unchanged (wake decay algorithms [14] are not included in this work), and the latter sets the strength of the newest wake ring to that of the old trailing edge.”