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arXiv · 2607.21142

Global bifurcation for steady viscous roll waves on an incline

Daniel Abraham·Miles H. Wheeler
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Abstract

We construct a branch of travelling periodic `roll wave' solutions to the free-boundary incompressible Navier--Stokes equations on an inclined plane in two dimensions. These solutions bifurcate from a parallel shear flow, under natural assumptions on the related Orr--Sommerfeld equation. Using techniques from analytic global bifurcation theory, we extend the local branch to a global curve of solutions. A key step of the proof is reformulating the problem, including the unknown free boundary, as an elliptic system in the sense of Agmon--Douglis--Nirenberg. Finally, we verify the hypotheses on the Orr--Sommerfeld equation for two regimes: small wavenumber and low Reynolds number.

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Daniel Abraham, Miles H. Wheeler. 2026-07-23. Global bifurcation for steady viscous roll waves on an incline. https://arxiv.org/abs/2607.21142

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