The lift-up effect: the linear mechanism behind transition and turbulence in shear flows

L Brandt - European Journal of Mechanics-B/Fluids, 2014 - Elsevier
The formation and amplification of streamwise velocity perturbations induced by cross-
stream disturbances is ubiquitous in shear flows. This disturbance growth mechanism, so …

Turbulent channel flow of dense suspensions of neutrally buoyant spheres

F Picano, WP Breugem, L Brandt - Journal of Fluid Mechanics, 2015 - cambridge.org
Dense particle suspensions are widely encountered in many applications and in
environmental flows. While many previous studies investigate their rheological properties in …

Beyond Bagnold: rheological measurements of inertial suspensions

ML Hunt, R Zenit - International Journal of Multiphase Flow, 2024 - Elsevier
Since the seminal study by Bagnold in 1954, which was inspired by sand movement in the
desert and sediment transport in rivers, researchers have continued to investigate inertial …

Numerical simulations of emulsions in shear flows

ME Rosti, F De Vita, L Brandt - Acta Mechanica, 2019 - Springer
We present a modification of a recently developed volume of fluid method for multiphase
problems (Ii et al. in J Comput Phys 231 (5): 2328–2358, 2012), so that it can be used in …

Laminar, turbulent, and inertial shear-thickening regimes in channel flow of neutrally buoyant particle suspensions

I Lashgari, F Picano, WP Breugem, L Brandt - Physical review letters, 2014 - APS
The aim of this Letter is to characterize the flow regimes of suspensions of finite-size rigid
particles in a viscous fluid at finite inertia. We explore the system behavior as a function of …

The effect of particle density in turbulent channel flow laden with finite size particles in semi-dilute conditions

W Fornari, A Formenti, F Picano, L Brandt - Physics of Fluids, 2016 - pubs.aip.org
We study the effect of varying the mass and volume fraction of a suspension of rigid spheres
dispersed in a turbulent channel flow. We performed several direct numerical simulations …

Universal scaling laws for dense particle suspensions in turbulent wall-bounded flows

P Costa, F Picano, L Brandt, WP Breugem - Physical review letters, 2016 - APS
The macroscopic behavior of dense suspensions of neutrally buoyant spheres in turbulent
plane channel flow is examined. We show that particles larger than the smallest turbulence …

Shear thinning of noncolloidal suspensions

A Vázquez-Quesada, RI Tanner, M Ellero - Physical review letters, 2016 - APS
Shear thinning—a reduction in suspension viscosity with increasing shear rates—is
understood to arise in colloidal systems from a decrease in the relative contribution of …

Drag reduction in turbulent channel flow laden with finite-size oblate spheroids

MN Ardekani, P Costa, WP Breugem… - Journal of Fluid …, 2017 - cambridge.org
We study suspensions of oblate rigid particles in a viscous fluid for different values of the
particle volume fractions. Direct numerical simulations have been performed using a direct …

Jamming distance dictates colloidal shear thickening

S Pradeep, M Nabizadeh, AR Jacob, S Jamali… - Physical Review Letters, 2021 - APS
We report experimental and computational observations of dynamic contact networks for
colloidal suspensions undergoing shear thickening. The dense suspensions are comprised …