Free falling and rising of spherical and angular particles

Direct numerical simulations of freely falling and rising particles in an infinitely long domain, with periodic lateral boundary conditions, are performed. The focus is on characterizing the free motion of cubical and tetrahedral particles for different Reynolds numbers, as an extension to the well-...

Full description

Saved in:
Bibliographic Details
Published in:Physics of fluids (1994) 2014-08, Vol.26 (8), p.185-194
Main Authors: Rahmani, M., Wachs, A.
Format: Article
Language:English
Subjects:
BOUNDARY CONDITIONS
CHAOS THEORY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer Science
COMPUTERIZED SIMULATION
Fluid dynamics
FLUIDS
Free fall
INSTABILITY
Mathematics
Modeling and Simulation
PARTICLES
PERIODICITY
Physics
ROTATION
SPHERICAL CONFIGURATION
TORQUE
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Direct numerical simulations of freely falling and rising particles in an infinitely long domain, with periodic lateral boundary conditions, are performed. The focus is on characterizing the free motion of cubical and tetrahedral particles for different Reynolds numbers, as an extension to the well-studied behaviour of freely falling and rising spherical bodies. The vortical structure of the wake, dynamics of particle movement, and the interaction of the particle with its wake are studied. The results reveal mechanisms of path instabilities for angular particles, which are different from those for spherical ones. The rotation of the particle plays a more significant role in the transition to chaos for angular particles. Following a framework similar to that of Mougin and Magnaudet [“Wake-induced forces and torques on a zigzagging/spiralling bubble,” J. Fluid Mech. 567, 185–194 (2006)], the balance of forces and torques acting on particles is discussed to gain more insight into the path instabilities of angular particles.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4892840