Geometric Hydrodynamics in Open Problems

Abstract

Geometric Hydrodynamics has flourished ever since the celebrated 1966 paper of V. Arnold. In this paper we present a collection of open problems along with several new constructions in fluid dynamics and a concise survey of recent developments and achievements in this area. The topics discussed include variational settings for different types of fluids, models for invariant metrics, the Cauchy and boundary value problems, partial analyticity of solutions to the Euler equations, their steady and singular vorticity solutions, differential and Hamiltonian geometry of diffeomorphism groups, long-time behaviour of fluids, as well as mechanical models of direct and inverse cascades.

arXiv comment41 pages, 5 figures, a new section and more details and references are added

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• Twisting in Hamiltonian Flows and Perfect Fluids
• Two-dimensional fluids via matrix hydrodynamics
• Decay of Time Correlations in Point Vortex Systems
• Logarithmic spirals in 2d perfect fluids
• Controllability and diffeomorphism groups on manifolds with boundary