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physics.flu-dyn2026
Numerical comparison of energy- versus circulation-preserving stochastic vortex dynamics
Sagy Ephrati, Darryl D. Holm
We compare two geometric stochastic frameworks for the two-dimensional Euler equations, being the circulation-preserving stochastic advection by Lie transport (SALT) and the energy…
physics.flu-dyn2026
Minimum-enstrophy solutions in topographic quasi-geostrophic flow on the rotating sphere
Sagy Ephrati, Erik Jansson
The minimum-enstrophy theory of Bretherton and Haidvogel postulates that two-dimensional turbulent systems evolve to a state that minimises enstrophy at a fixed energy level. We ex…