280 citations · 4k across the 93 of their papers we have counts for
94 papers · 1 filter
Intermittency in turbulent emulsions
Marco Crialesi-Esposito, Guido Boffetta, Luca Brandt +2
We investigate the statistics of turbulence in emulsions of two-immiscible fluids of same density. We compute for the first time velocity increments between points conditioned to b…
Rheology of dense fiber suspensions: Origin of yield stress, shear thinning and normal stress differences
Monsurul Khan, Rishabh V. More, Luca Brandt +1
We explain the origins of yield stress, shear-thinning, and normal stress differences in rigid fiber suspensions. We investigate the interplay between the hydrodynamic, colloidal a…
The role of wetting on the flow of two immiscible fluids in porous media
Armin Shahmardi, Salar Zamani Salimi, Outi Tammisola +2
We study the role of the capillary number, and of the surface wettability on the dynamics of the interface between an invading and a defending phase in a porous medium by mean…
Viscoelasticity of suspension of red blood cells under oscillatory shear flow
Naoki Takeishi, Marco Edoardo Rosti, Naoto Yokoyama +1
We present a numerical analysis of the rheology of a suspension of red blood cells (RBCs) for different volume fractions in a wall-bounded, effectively inertialess, small amplitude…
The interaction of droplet dynamics and turbulence cascade
Marco Crialesi-Esposito, Sergio Chibbaro, Luca Brandt
The dynamics of droplet fragmentation in turbulence is described in the Kolmogorov-Hinze framework. Yet, a quantitative theory is lacking at higher concentrations when strong inter…
Evaporating Rayleigh-Bénard convection: prediction of interface temperature and global heat transfer modulation
Nicoló Scapin, Andreas D. Demou, Luca Brandt
We propose an analytical model to estimate the interface temperature and the Nusselt number for an evaporating two-layer Rayleigh-Bénard configuration in statistically s…
FluTAS: A GPU-accelerated finite difference code for multiphase flows
Marco Crialesi-Esposito, Nicolo Scapin, Andreas D. Demou +4
We present the Fluid Transport Accelerated Solver, FluTAS, a scalable GPU code for multiphase flows with thermal effects. The code solves the incompressible Navier-Stokes equation…
Numerical simulation of the coalescence-induced polymeric droplet jumping on superhydrophobic surfaces
Kazem Bazesefidpar, Luca Brandt, Outi Tammisola
Self-propelled jumping of two polymeric droplets on superhydrophobic surfaces is investigated by three-dimensional direct numerical simulations. Two identical droplets of a viscoel…
A dual resolution phase-field solver for wetting of viscoelastic droplets
Kazem Bazesefidpar, Luca Brandt, Outi Tammisola
We present a new and efficient phase-field solver for viscoelastic fluids with moving contact line based on a dual-resolution strategy. The interface between two immiscible fluids…
Modulation of homogeneous and isotropic turbulence in emulsions
Marco Crialesi-Esposito, Marco Edoardo Rosti, Sergio Chibbaro +1
We present a numerical study of emulsions in homogeneous and isotropic turbulence at . The problem is addressed via Direct Numerical Simulations (DNS), where the Volume o…
The effect of droplet coalescence on drag in turbulent channel flows
Ianto Cannon, Daulet Izbassarov, Outi Tammisola +2
We study the effect of droplet coalescence on turbulent wall-bounded flows, by means of direct numerical simulations. In particular, the volume-of-fluid and front-tracking methods…
Rheology of concentrated suspension of fibers with load dependent friction coefficient
Monsurul Khan, Rishabh V. More, Arash Alizad Banaei +2
We numerically investigate the effects of fiber aspect ratio, roughness, flexibility, and flow inertia on the rheology of concentrated suspensions. We perform direct numerical simu…
A fully Eulerian hybrid Immersed Boundary-Phase Field Model for contact line dynamics on complex geometries
Armin Shahmardi, Marco Edoardo Rosti, Outi Tammisola +1
We present a fully Eulerian hybrid immersed-boundary/phase-field model to simulate wetting and contact line motion over any arbitrary geometry. The solid wall is described with a v…
Orientation instability of settling spheroids in a linearly density stratified fluid
Rishabh V. More, Mehdi N. Ardekani, Luca Brandt +1
Much work has been done to understand the settling dynamics of spherical particles in a homogeneous and a stratified fluid. However, the effects of shape anisotropy on the settling…
Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence
Nicolò Scapin, Federico Dalla Barba, Giandomenico Lupo +3
We perform interface-resolved simulations of finite-size evaporating droplets in weakly-compressible homogeneous shear turbulence (HST). The study is conducted by varying three dim…
A pressure-based diffuse interface method for low-Mach multiphase flows with mass transfer
Andreas D. Demou, Nicoló Scapin, Marica Pelanti +1
This study presents a novel pressure-based methodology for the efficient numerical solution of a four-equation two-phase diffuse interface model. The proposed methodology has the p…
Near-wall turbulence modulation by small inertial particles
Pedro Costa, Luca Brandt, Francesco Picano
We use interface-resolved simulations to study near-wall turbulence modulation by small inertial particles, much denser than the fluid, in dilute/semi-dilute conditions. We conside…
Suspensions of deformable particles in Poiseuille flows at finite inertia
Luigi Filippo Chiara, Marco Edoardo Rosti, Francesco Picano +1
We analyze a suspension of deformable particles in a pressure-driven flow. The suspension is composed of neutrally buoyant initially spherical particles and a Newtonian carrier flu…
Fiber Tracking Velocimetry for two-point statistics of turbulence
Stefano Brizzolara, Marco Edoardo Rosti, Stefano Olivieri +3
We propose and validate a novel experimental technique to measure two-point statistics of turbulent flows. It consists in spreading rigid fibers in the flow and tracking their posi…
The impact of porous walls on the rheology of suspensions
Marco E. Rosti, Parisa Mirbod, Luca Brandt
We study the effect of isotropic porous walls on a plane Couette flow laden with spherical and rigid particles. We perform a parametric study varying the volume fraction between $0…
Aerodynamically-driven rupture of a liquid film by turbulent shear flow
Melissa Kozul, Pedro S. Costa, James R. Dawson +1
The rupture of a liquid film due to co-flowing turbulent shear flows in the gas phase is studied using a volume-of-fluid method. To simulate this multiphase problem, we use a simpl…
Low Reynolds number turbulent flows over elastic walls
Marco E Rosti, Luca Brandt
We study the laminar and turbulent channel flow over a viscous hyper-elastic wall and show that it is possible to sustain an unsteady chaotic turbulent-like flow at any Reynolds nu…
Regimes of heat transfer in particle suspensions
Ali Yousefi, Mehdi Niazi Ardekani, Francesco Picano +1
We present results of interface-resolved simulations of heat transfer in suspensions of finite-size neutrally-buoyant spherical particles for solid volume fractions up to 35% and b…
Dispersed fibers change the classical energy budget of turbulence via nonlocal transfer
S. Olivieri, L. Brandt, M. E. Rosti +1
The back-reaction of dispersed rigid fibers to turbulence is analyzed by means of a state-of-the-art fully-coupled immersed boundary method. The following universal scenario is ide…