Fredholm determinants, continued fractions, Jost and Evans functions for a Jacobi matrix associated with the 2D-Euler equations

Y Latushkin, S Vasudevan - Analysis without Borders: Dedicated to Ilya …, 2024 - Springer
For a second order difference equation that arises in the study of stability of unidirectional
(generalized Kolmogorov) flows for the Euler equations of ideal fluids on the two …

Stability results for idealized shear flows on a rectangular periodic domain

HR Dullin, J Worthington - Journal of Mathematical Fluid Mechanics, 2018 - Springer
We present a new linearly stable solution of the Euler fluid flow on a torus. On a two-
dimensional rectangular periodic domain 0, 2 π) * 0, 2 π/κ) 0, 2 π)× 0, 2 π/κ) for κ ∈ R^+ κ∈ …

Characteristic determinants for a second order difference equation on the half-line arising in hydrodynamics

Y Latushkin, S Vasudevan - arXiv preprint arXiv:2405.01135, 2024 - arxiv.org
We study the point spectrum of a second order difference operator with complex potential on
the half-line via Fredholm determinants of the corresponding Birman-Schwinger operator …

Instability of Unidirectional Flows for the 2D Navier–Stokes Equations and Related -Models

S Vasudevan - Journal of Mathematical Fluid Mechanics, 2021 - Springer
We study instability of unidirectional flows for the linearized 2D Navier–Stokes equations on
the torus. Unidirectional flows are steady states whose vorticity is given by Fourier modes …

Instability of unidirectional flows for the 2D -Euler equations

H Dullin, Y Latushkin, R Marangell… - arXiv preprint arXiv …, 2019 - arxiv.org
We study stability of unidirectional flows for the linearized 2D $\alpha $-Euler equations on
the torus. The unidirectional flows are steady states whose vorticity is given by Fourier …

[HTML][HTML] An Evans function for the linearised 2D Euler equations using Hill's determinant

HR Dullin, R Marangell - Physica D: Nonlinear Phenomena, 2024 - Elsevier
We study the point spectrum of the linearisation of Euler's equation for the ideal fluid on the
torus about a shear flow. By separation of variables the problem is reduced to the spectral …

Poisson structure of the three-dimensional Euler equations in Fourier space

HR Dullin, JD Meiss, J Worthington - Journal of Physics A …, 2019 - iopscience.iop.org
We derive a simple Poisson structure in the space of Fourier modes for the vorticity
formulation of the Euler equations on a three-dimensional periodic domain. This allows us to …

Stability theory and Hamiltonian dynamics in the Euler ideal fluid equations

J Worthington - Bulletin of the Australian Mathematical Society, 2017 - cambridge.org
The study of shear flow steady states has led to a wealth of research in the field of fluid
dynamics. By studying shear flows, we can understand how a fluid behaves and how …

Instability of Equilibria for the 2D Euler Equations on the torus

J Worthington, HR Dullin, R Marangell - arXiv preprint arXiv:1505.01667, 2015 - arxiv.org
We consider the hydrodynamics of an incompressible fluid on a 2D periodic domain. There
exists a family of stationary solutions with vorticity given by $\Omega^*=\alpha\cos (\mathbf …

Stability Theory of the 3-Dimensional Euler Equations

HR Dullin, J Worthington - SIAM Journal on Applied Mathematics, 2019 - SIAM
The Euler equations on a three-dimensional periodic domain have a family of shear flow
steady states. We derive a formulation of the dynamics of the vorticity Fourier modes on a …