Dynamics of finite-size spheroids in turbulent flow: the roles of flow structures and particle boundary layers
arXiv:2202.03937 · doi:10.1017/jfm.2022.197
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 axisymmetric shapes, from oblate to prolate, and the particle volume dependences. We show that the accelerations and rotations experienced by non-spherical inertial-scale particles result from volume filtered fluid forces and torques, similar to spherical particles. However, the particle orientations carry signatures of preferential alignments with the surrounding flow structures, which is reflected in distinct axial and lateral fluctuations for accelerations and rotation rates. The randomization of orientations does not occur even for particles with volume equivalent diameter size in the inertial range, here up to 60 at . Additionally, we demonstrate that the role of fluid boundary layers around the particles cannot be neglected to reach a quantitative understanding of particle statistical dynamics, as they affect the intensities of angular velocities, and the relative importance of tumbling with respect to spinning rotations. This study brings to the fore the importance of inertial-scale flow structures in homogeneous and isotropic turbulence and their impacts on the transport of neutrally-buoyant bodies with size in the inertial range.
arXiv comment21 pages, 11 figures
References in corpus (28)
- An Immersed Boundary Method with Direct Forcing for the Simulation of Particulate Flows
- Fluid Particle Accelerations in Fully Developed Turbulence
- Measurement of Particle Accelerations in Fully Developed Turbulence
- Heavy particle concentration in turbulence at dissipative and inertial scales
- Rotation Rate of Rods in Turbulent Fluid Flow
- Turbulent transport of material particles: An experimental study of finite size effects
- Collision model for fully-resolved simulations of flows laden with finite-size particles
- Finite-size effects in the dynamics of neutrally buoyant particles in turbulent flow
- Numerical Study of the Sedimentation of Spheroidal Particles
- Acceleration statistics of finite-sized particles in turbulent flow: the role of Faxen forces
- Dimensionality and morphology of particle and bubble clusters in turbulent flow
- Shape-dependence of particle rotation in isotropic turbulence
- Alignment of vorticity and rods with Lagrangian fluid stretching in turbulence
- Dynamics of inertial particles in a turbulent von Karman flow
- Velocity gradients statistics along particle trajectories in turbulent flows: the refined similarity hypothesis in the Lagrangian frame
- Tumbling of small axisymmetric particles in random and turbulent flows
- Microbubbles and microparticles are not faithful tracers of turbulent acceleration
- On the clustering of finite-size particles in turbulence
- Slipping motion of large neutrally-buoyant particles in turbulence
- Inertial Range Scaling in Rotations of Long Rods in Turbulence
- Dispersion of air bubbles in isotropic turbulence
- Impact of trailing wake drag on the statistical properties and dynamics of finite-sized particle in turbulence
- Experimental measurement of acceleration correlations and pressure structure functions in high Reynolds number turbulence
- Spinning and tumbling of long fibers in isotropic turbulence
- Persistent accelerations disentangle Lagrangian turbulence
- Rotation of anisotropic particles in Rayleigh-Bénard turbulence
- Anisotropic particles in two-dimensional convective turbulence
- Rotational dynamics of bottom-heavy rods in turbulence from experiments and numerical simulations