3 papers
physics.flu-dyn2025
Conserved Pseudomomenta in Linear Quasigeostrophic Fluid Flows From Noether's Theorem
Dusan Begus, Chenyu Zhang, J. B. Marston
Hamiltonian and Lagrangian formulations for the two-dimensional quasi-geostrophic equations linearized about a zonally-symmetric basic flow are presented. The Lagrangian and Hamilt…
physics.flu-dyn2024
Direct Statistical Simulation Using Generalised Cumulant Expansions
G. V. Nivarti, J. B. Marston, S. M. Tobias
In recent years, the Generalised Quasilinear (GQL) approximation has been developed and its efficacy tested against purely quasilinear (QL) approximations. GQL systematically inter…
physics.flu-dyn2024
Non-equivalence of quasilinear dynamical systems and their statistical closures
G. V. Nivarti, R. R. Kerswell, J. B. Marston +1
It is widely believed that statistical closure theories for dynamical systems provide statistics equivalent to those of the governing dynamical equations from which the former are…