Spinning and tumbling of long fibers in isotropic turbulence
Theresa B. Oehmke, Ankur Bordoloi, Evan Variano, Gautier Verhille
Abstract
We simultaneously measure both the spinning and the tumbling components of rotation for long inertial fibers in isotropic turbulence. The spinning rates of these fibers are higher than the tumbling rates, manifesting dynamics analogous to sub-Kolmogorov fibers in turbulent flows. Similar to how sub-Kolmogorov fibers preferentially align with the local vorticity, long fibers preferentially align with the large scale coherent vortex filaments that can be as long as the integral scale of the turbulent flow.
Topics & Concepts
TurbulenceSpinningIsotropyHomogeneous isotropic turbulenceMechanicsKolmogorov microscalesScalingPower lawPhysicsRotation (mathematics)Length scaleVortexFiberClassical mechanicsTurbulence kinetic energyMaterials scienceGeometryOpticsMathematicsDirect numerical simulationK-omega turbulence modelComposite materialStatisticsReynolds numberFluid Dynamics and Turbulent FlowsParticle Dynamics in Fluid FlowsAeolian processes and effects