Stretching and Buckling of Small Elastic Fibers in Turbulence

Sofia Allende , Christophe Henry (1) , J Bec (2)

1 CNRS - Centre National de la Recherche Scientifique
2 LAGRANGE - Joseph Louis LAGRANGE

Small flexible fibers in a turbulent flow are found to be most of the time as straight as stiff rods. This is due to the cooperative action of flexural rigidity and fluid stretching. However, fibers might bend and buckle when they tumble and experience a strong-enough local compressive shear. Such events are similar to an activation process, where the role of temperature is played by the inverse of Young's modulus. Numerical simulations show that buckling occurs very intermittently in time. This results from unexpected long-range Lagrangian correlations of the turbulent shear.

Domaines: Dynamique des Fluides [physics.flu-dyn]

Sofia Allende, Christophe Henry, J Bec. Stretching and Buckling of Small Elastic Fibers in Turbulence. Physical Review Letters, 2018, 121 (15), ⟨10.1103/PhysRevLett.121.154501⟩. ⟨hal-02362950⟩