Numerical study of turbulent channel flow laden with finite-size non-spherical particles

Conference paper (2017)

Authors

Luca Brandt KTH Royal Institute of Technology
Mehdi Niazi Ardekani KTH Royal Institute of Technology
Francesco Picano Università degli Studi di Padova
P. Simões Costa Fluid Mechanics - Mechanical, Maritime and Materials Engineering
W.P. Breugem Multi Phase Systems - Mechanical, Maritime and Materials Engineering
Research Group
Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
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Published Date

2017

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

We present interface-resolved numerical simulations of turbulent channel flow laden with non-spherical rigid and neutrally-buoyant particles. We first focus on the case of oblate particles of aspect ratio 1/3 at volume fractions up to 15% and show that the turbulent drag is decreasing when increasing the particle volume fraction although the effective viscosity of the suspension actually increases. We relate the observed drag reduction to turbulence attenuation and to particle migration away from the near-wall region. Particles tend to align parallel to the wall with rotation rates significantly lower than those reported for spheres. In the second part of the study, we examine the effect of the particle slenderness on the observed drag reduction and show that the drag increases for flatter particles.

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