The t^{-3/2} decay of shed vorticity in 2D inviscid flow makes the second moment diverge logarithmically, so finite-dimensional system-ID models fitted to such data parameterize the observation horizon rather than intrinsic physics.
Horta, and Richard W
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The inviscid Euler limit as a critical boundary for moment-based aerodynamic system identification
The t^{-3/2} decay of shed vorticity in 2D inviscid flow makes the second moment diverge logarithmically, so finite-dimensional system-ID models fitted to such data parameterize the observation horizon rather than intrinsic physics.