Theoretical and Computational Fluid Dynamics

, Volume 22, Issue 1, pp 37–64 | Cite as

Hamiltonian structure for a neutrally buoyant rigid body interacting with N vortex rings of arbitrary shape: the case of arbitrary smooth body shape

  • Banavara N. Shashikanth
  • Artan Sheshmani
  • Scott David Kelly
  • Jerrold E. Marsden
Original Article


We present a (noncanonical) Hamiltonian model for the interaction of a neutrally buoyant, arbitrarily shaped smooth rigid body with N thin closed vortex filaments of arbitrary shape in an infinite ideal fluid in Euclidean three-space. The rings are modeled without cores and, as geometrical objects, viewed as N smooth closed curves in space. The velocity field associated with each ring in the absence of the body is given by the Biot–Savart law with the infinite self-induced velocity assumed to be regularized in some appropriate way. In the presence of the moving rigid body, the velocity field of each ring is modified by the addition of potential fields associated with the image vorticity and with the irrotational flow induced by the motion of the body. The equations of motion for this dynamically coupled body-rings model are obtained using conservation of linear and angular momenta. These equations are shown to possess a Hamiltonian structure when written on an appropriately defined Poisson product manifold equipped with a Poisson bracket which is the sum of the Lie–Poisson bracket from rigid body mechanics and the canonical bracket on the phase space of the vortex filaments. The Hamiltonian function is the total kinetic energy of the system with the self-induced kinetic energy regularized. The Hamiltonian structure is independent of the shape of the body, (and hence) the explicit form of the image field, and the method of regularization, provided the self-induced velocity and kinetic energy are regularized in way that satisfies certain reasonable consistency conditions.


Ideal hydrodynamics Hydrodynamical interaction Vortex ring Vorticity Hamiltonian structure Poisson bracket Lie–Poisson bracket 

PACS 47.10.Df 47.32.cb 


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Banavara N. Shashikanth
    • 1
  • Artan Sheshmani
    • 2
  • Scott David Kelly
    • 3
  • Jerrold E. Marsden
    • 4
  1. 1.Department of Mechanical EngineeringNew Mexico State UniversityLas CrucesUSA
  2. 2.Department of MathematicsUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  3. 3.Department of Mechanical Engineering and ScienceUniversity of North Carolina at CharlotteCharlotteUSA
  4. 4.Department of Control and Dynamical SystemsCalifornia Institute of TechnologyPasadenaUSA

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