Abstract
For an autonomous, conservative, two degree-of-freedom dynamical system, vorticity (the curl of velocity) is constant along the orbit if the velocity field is divergence-free such that:
Isovortical orbits in configuration space are level curves of a scalar autonomous function Ψ (x, v) satisfying a second-order, non-linear partial differential equation of the Monge-Ampere type:
where U(x. y) is the autonomous potential function. The solution Soc the time variable is reduced to a quadrature following determinatio of Ψ. Self-similar solutions of the Monge-Ampere equation under Birkhoff's one-parameter transformation group are derived for homogeneous (power-law) potential functions. It is shown that Keplerian orbits belong to the class of planar isovortical flows.
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Hough, M.E. Isovortical orbits of autonomous, conservative, two degree-of-freedom dynamical systems. Celestial Mechanics 36, 1–18 (1985). https://doi.org/10.1007/BF01241040
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DOI: https://doi.org/10.1007/BF01241040