Shape-dependence of particle rotation in isotropic turbulence

  title={Shape-dependence of particle rotation in isotropic turbulence},
  author={Margaret L. Byron and Jonas Einarsson and Kristian Gustavsson and Gregory A. Voth and Bernhard Mehlig and Evan A. Variano},
  journal={Physics of Fluids},
We consider the rotation of neutrally buoyant axisymmetric particles suspended in isotropic turbulence. Using laboratory experiments as well as numerical and analytical calculations, we explore how particle rotation depends upon particle shape. We find that shape strongly affects orientational trajectories, but that it has negligible effect on the variance of the particle angular velocity. Previous work has shown that shape significantly affects the variance of the tumbling rate of axisymmetric… 

Figures and Tables from this paper

Shape- and scale-dependent coupling between spheroids and velocity gradients in turbulence

Abstract Rotations of spheroidal particles immersed in turbulent flows reflect the combined effects of fluid strain and vorticity, as well as the time history of these quantities along the particle's

Transport of anisotropic particles under waves

Using a numerical model, we analyse the effects of shape on both the orientation and transport of anisotropic particles in wavy flows. The particles are idealized as prolate and oblate spheroids, and

Mapping spheroid rotation modes in turbulent channel flow: effects of shear, turbulence and particle inertia

The rotational behaviour of non-spherical particles in turbulent channel flow is studied by Lagrangian tracking of spheroidal point particles in a directly simulated flow. The focus is on the complex

Orientation patterns of non-spherical particles in turbulence

When non-spherical particles in a turbulent flow spend a long time near each other, they might reasonably be expected to converge toward the same orientation because turbulent strains tend to align

Effect of fluid inertia on the orientation of a small prolate spheroid settling in turbulence

We study the angular dynamics of small non-spherical particles settling in a turbulent flow, such as ice crystals in clouds, aggregates of organic material in the oceans, or fibres settling in

Dynamics of finite-size spheroids in turbulent flow: the roles of flow structures and particle boundary layers

Abstract We study the translational and rotational dynamics of neutrally buoyant finite-size spheroids in hydrodynamic turbulence by means of fully resolved numerical simulations. We examine

Rotation of anisotropic particles in Rayleigh–Bénard turbulence

Abstract Inertialess anisotropic particles in a Rayleigh–Bénard turbulent flow show maximal tumbling rates for weakly oblate shapes, in contrast with the universal behaviour observed in developed



Rotation rate of rods in turbulent fluid flow.

The first three-dimensional experimental measurements of the orientation dynamics of rodlike particles as they are advected in a turbulent fluid flow are reported.

Orientation and rotation of inertial disk particles in wall turbulence

Abstract The translational and rotational dynamics of oblate spheroidal particles suspended in a directly simulated turbulent channel flow have been examined. Inertial disk-like particles exhibited a

Tumbling of small axisymmetric particles in random and turbulent flows.

The tumbling of small nonspherical, axisymmetric particles in random and turbulent flows is analyzed in terms of Lagrangian correlation functions, and it is shown that rotational and translational inertia affects the tumbling rate and the angle at which particles collide.

Shape effects on turbulent modulation by large nearly neutrally buoyant particles

Abstract We investigate dilute suspensions of Taylor-microscale-sized particles in homogeneous isotropic turbulence. In particular, we focus on the effect of particle shape on particle–fluid

Measurements of the solid-body rotation of anisotropic particles in 3D turbulence

We introduce a new method to measure Lagrangian vorticity and the rotational dynamics of anisotropic particles in a turbulent fluid flow. We use 3D printing technology to fabricate crosses (two

Turbulence modulation by large ellipsoidal particles: concentration effects

We use laboratory measurements to study how suspended ellipsoidal particles affect the velocity statistics of a turbulent flow. The ellipsoids have size, time, and velocity scales corresponding to

Orientation statistics of small particles in turbulence

The statistics of the alignment of axisymmetric microscopic particles in fully developed turbulent flow is studied numerically and theoretically. Direct numerical simulations (DNS) of turbulent flows

Direct numerical simulation of ellipsoidal particles in turbulent channel flow

This paper investigates the behaviour of elongated, axi-symmetric ellipsoidal particles, their interaction with turbulence, and the effects of the ellipsoids on turbulence in a turbulent channel flow

Orientation dynamics of small, triaxial–ellipsoidal particles in isotropic turbulence

Abstract The orientation dynamics of small anisotropic tracer particles in turbulent flows is studied using direct numerical simulation (DNS) and results are compared with Lagrangian stochastic