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

Abstract

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.

Authors:
; ;  [1]
  1. Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim (Norway)
Publication Date:
OSTI Identifier:
22483222
Resource Type:
Journal Article
Journal Name:
Physics of Fluids (1994)
Additional Journal Information:
Journal Volume: 27; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-6631
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; FLUIDS; MOMENT OF INERTIA; ORIENTATION; ROTATION; SIMULATION; SPHEROIDS; SPIN; SYMMETRY; TURBULENCE; WALLS

Citation Formats

Challabotla, Niranjan Reddy, Zhao, Lihao, and Andersson, Helge I. Shape effects on dynamics of inertia-free spheroids in wall turbulence. United States: N. p., 2015. Web. doi:10.1063/1.4922864.
Challabotla, Niranjan Reddy, Zhao, Lihao, & Andersson, Helge I. Shape effects on dynamics of inertia-free spheroids in wall turbulence. United States. https://doi.org/10.1063/1.4922864
Challabotla, Niranjan Reddy, Zhao, Lihao, and Andersson, Helge I. 2015. "Shape effects on dynamics of inertia-free spheroids in wall turbulence". United States. https://doi.org/10.1063/1.4922864.
@article{osti_22483222,
title = {Shape effects on dynamics of inertia-free spheroids in wall turbulence},
author = {Challabotla, Niranjan Reddy and Zhao, Lihao and Andersson, Helge I.},
abstractNote = {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.},
doi = {10.1063/1.4922864},
url = {https://www.osti.gov/biblio/22483222}, journal = {Physics of Fluids (1994)},
issn = {1070-6631},
number = 6,
volume = 27,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}