Article
Phase Space Density Representations in Fluid Dynamics
Journal of Statistical Physics
(1989)
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.
Disciplines
Publication Date
July, 1989
DOI
10.1007/BF01044238
Publisher Statement
At the time of publication John Ramshaw was affiliated with the Idaho National Engineering Laboratory.
Citation Information
J. D. Ramshaw, "Phase Space Density Representations in Fluid Dynamics," J. Stat. Phys. 56, 149 (1989).