Shape effects on dynamics of inertia-free spheroids in wall turbulence

Journal Article · Mon Jun 15 00:00:00 EDT 2015 · Physics of Fluids (1994)

DOI:https://doi.org/10.1063/1.4922864· OSTI ID:22483222

Challabotla, Niranjan Reddy; Zhao, Lihao; Andersson, Helge I. ^[1]

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1. Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim (Norway)

The rotational motion of inertia-free spheroids has been studied in a numerically simulated turbulent channel flow. Although inertia-free spheroids were translated as tracers with the flow, neither the disk-like nor the rod-like particles adapted to the fluid rotation. The flattest disks preferentially aligned their symmetry axes normal to the wall, whereas the longest rods were parallel with the wall. The shape-dependence of the particle orientations carried over to the particle rotation such that the mean spin was reduced with increasing departure from sphericity. The streamwise spin fluctuations were enhanced due to asphericity, but substantially more for prolate than for oblate spheroids.

• OSTI ID: 22483222
• Journal Information: Physics of Fluids (1994), Vol. 27, Issue 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-6631
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
FLUIDS
MOMENT OF INERTIA
ORIENTATION
ROTATION
SIMULATION
SPHEROIDS
SPIN
SYMMETRY
TURBULENCE
WALLS