Capturing the Edge of Chaos as a Spectral Submanifold in Pipe Flows

Autor:	Kaszás, Bálint, Haller, George
Rok vydání:	2023
Předmět:	Physics - Fluid Dynamics Nonlinear Sciences - Chaotic Dynamics
Druh dokumentu:	Working Paper
Popis:	An extended turbulent state can coexist with the stable laminar state in pipe flows. We focus here on short pipes with additional discrete symmetries imposed. In this case, the boundary between the coexisting basins of attraction, often called the edge of chaos, is the stable manifold of an edge state, which is a lower-branch traveling wave solution. We show that a low-dimensional submanifold of the edge of chaos can be constructed from velocity data using the recently developed theory of spectral submanifolds (SSMs). These manifolds are the unique smoothest nonlinear continuations of nonresonant spectral subspaces of the linearized system at stationary states. Using very low dimensional SSM-based reduced-order models, we predict transitions to turbulence or laminarization for velocity fields near the edge of chaos. Comment: Accepted for publication in the Journal of Fluid Mechanics
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2311.06800 Zobrazit plný text záznamu View this record from Arxiv