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18 papers · 2 filters
Edge state modulation by mean viscosity gradients
Enrico Rinaldi, Philipp Schlatter, Shervin Bagheri
Motivated by the relevance of edge state solutions as mediators of transition, we use direct numerical simulations to study the effect of spatially non-uniform viscosity on their e…
Integral representation of channel flow with interacting particles
Itzhak Fouxon, Zhouyang Ge, Luca Brandt +1
We construct a boundary integral representation for the low-Reynolds-number flow in a channel in the presence of freely-suspended particles (or droplets) of arbitrary size and shap…
Suspensions of finite-size neutrally-buoyant spheres in turbulent duct flow
Walter Fornari, Hamid Tabaei Kazerooni, Jeanette Hussong +1
We study the turbulent square duct flow of dense suspensions of neutrally-buoyant spherical particles. Direct numerical simulations (DNS) are performed in the range of volume fract…
Clustering and increased settling speed of oblate particles at finite Reynolds number
Walter Fornari, Mehdi Niazi Ardekani, Luca Brandt
We study the settling of rigid oblates in quiescent fluid using interface-resolved Direct Numerical Simulations. In particular, an immersed boundary method is used to account for t…
Interface-resolved simulations of particle suspensions in Newtonian, shear thinning and shear thickening carrier fluids
Dhiya Alghalibi, Iman Lashgari, Luca Brandt +1
We present a numerical study of noncolloidal spherical and rigid particles suspended in Newtonian, shear thinning and shear thickening fluids employing an Immersed Boundary Method.…
Viscous Taylor droplets in axisymmetric and planar tubes: from Bretherton's theory to empirical models
Gioele Balestra, Lailai Zhu, François Gallaire
The aim of this study is to derive accurate models for quantities characterizing the dynamics of droplets of non-vanishing viscosity in capillaries. In particular, we propose model…