Abstract
Phase space density representations of inviscid fluid dynamics were recently discussed by Abarbanel and Rouhi. Here it is shown that such representations may be simply derived and interpreted by means of the Liouville equation corresponding to the dynamical system of ordinary differential equations that describes fluid particle trajectories. The Hamiltonian and Poisson bracket for the phase space density then emerge as immediate consequences of the corresponding structure of the dynamics. For barotropic fluids, this approach leads by direct construction to the formulation presented by Abarbanel and Rouhi. Extensions of this formulation to inhomogeneous incompressible fluids and to fluids in which the state equation involves an additional transported scalar variable are constructed by augmenting the single-particle dynamics and phase space to include the relevant additional variable.
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References
H. D. I. Abarbanel and A. Rouhi,Phys. Fluids 30:2952 (1987).
J. D. Ramshaw,Phys. Lett. A 116:110 (1986).
J. D. Ramshaw and K. Lindenberg,J. Stat. Phys. 45:295 (1986).
H. Grabert, R. Graham, and M. S. Green,Phys. Rev. A 21:2136 (1980).
J. D. Ramshaw,J. Stat. Phys. 38:669 (1985).
R. G. Littlejohn, Singular Poisson tensors, inMathematical Methods in Hydrodynamics and Integrability in Dynamical Systems, M. Tabor and Y. M. Treve, eds. (American Institute of Physics, New York, 1982), p. 47.
D. D. Holm, B. A. Kupershmidt, and C. D. Levermore,Advan. Appl. Math. 6:52 (1985).
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Ramshaw, J.D. Phase space density representations in fluid dynamics. J Stat Phys 56, 149–158 (1989). https://doi.org/10.1007/BF01044238
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DOI: https://doi.org/10.1007/BF01044238