First coherent structure in elasto-inertial turbulence
Yves Dubief, Jacob Page, Rich R. Kerswell, Vincent Terrapon, Victor Steinberg
Abstract
Elastoinertial turbulence (EIT) is a state of chaos found in wall-bounded flows with polymer additives over a large range of Reynolds numbers. Although the existence of EIT at subcritical Reynolds numbers is proof that complex polymer dynamics drive chaos, the exact mechanism remains poorly understood. The first coherent structure of EIT, shaped like its name, arrowhead, has been identified in two-dimensional channel flows and can be made to become perfectly steady and symmetrical. Its dynamics holds critical clues about the physics that drive or inhibit chaos in EIT flows.
Topics & Concepts
TurbulenceLagrangian coherent structuresInertial frame of referenceTurbulence kinetic energyMechanicsFlow (mathematics)PhysicsStatistical physicsInertial waveKinetic energyClassical mechanicsOpticsWave propagationLongitudinal waveMechanical waveRheology and Fluid Dynamics StudiesFluid Dynamics and Turbulent FlowsParticle Dynamics in Fluid Flows