Unit
Laboratory of Fluid Mechanics and Instabilities
LaboratoryRelated publications (745)
Stability of a liquid layer draining around a horizontal cylinder: Interplay of capillary and gravity forces
François Gallaire, Shahab Eghbali, Simeon Vladimirov Djambov
We study the drainage of a viscous liquid film coating the outside of a solid horizontal cylinder, where gravity acts vertically. We focus on the limit of large Ohnesorge numbers Oh, where inertia is negligible compared to viscous effects. We first study t ...
Amer Physical Soc2024Noise-induced transitions past the onset of a steady symmetry-breaking bifurcation: The case of the sudden expansion
François Gallaire, Edouard Boujo, Yves-Marie François Ducimetière
We consider fluid flows, governed by the Navier-Stokes equations, subject to a steady symmetry-breaking bifurcation and forced by a weak noise acting on a slow timescale. By generalizing the multiple-scale weakly nonlinear expansion technique employed in t ...
2024Painting Taylor vortices with cellulose nanocrystals: Suspension flow supercritical spectral dynamics
We study the flow stability and spatiotemporal spectral dynamics of cellulose nanocrystal (CNC) suspensions in a custom Taylor-Couette flow cell using the intrinsic shear induced birefringence and liquid crystalline properties of CNC suspensions for flow v ...
Aip Publishing2024Instability and trajectories of buoyancy-driven annular disks: A numerical study
François Gallaire, Pier Giuseppe Ledda, Giovanni Vagnoli
We investigate the stability of the steady vertical path and the emerging trajectories of a buoyancy -driven annular disk as the diameter of its central hole is varied. The steady and axisymmetric wake associated with the steady vertical path of the disk, ...
Amer Physical Soc2024Enhancing Wind Farm Performance through Axial Induction and Tilt Control: Insights from Wind Tunnel Experiments
Fernando Porté Agel, Guillem Armengol Barcos
Static axial induction control and tilt control are two strategies that have the potential to increase power production in wind farms, mitigating wake effects and increasing the available power for downstream turbines. In this study, wind tunnel experiment ...
Basel2024Towards an improved understanding of wind turbine wakes in complex terrain
In this thesis, we explored the effect of certain terrain-induced flow phenomena on the development of wind turbines sited in complex terrain. A combined experimental and analytical approach is used to study wind turbine wakes in different types of complex ...
EPFL2024An improved analytical framework for flow prediction inside and downstream of wind farms
Fernando Porté Agel, Marwa Souaiby
This study evaluates available analytical wake models for flow prediction inside and downstream of wind farms of different sizes and layouts using large-eddy simulation (LES), and introduces an enhanced analytical framework. All the tested analytical wake ...
2024Wind turbine wake superposition under pressure gradient
Fernando Porté Agel, Arslan Salim Dar
We investigate the effect of pressure gradient on the cumulative wake of multiple turbines in wind tunnel experiments spanning across a range of adverse pressure gradient (APG), zero pressure gradient (ZPG), and favorable pressure gradient (FPG). Compared ...
2024The effect of nacelle-to-rotor size on the wake of a miniature wind turbine
Fernando Porté Agel, Arslan Salim Dar, Rim Majzoub
Wind tunnel experiments are performed to investigate the effect of nacelle-to-rotor size on the wake of a wind turbine under different Reynolds numbers. Four different turbine configurations are tested, which vary in the rotor diameter and nacelle length a ...
IOP Science2024The effect of nacelle-to-rotor size on the wake of a miniature wind turbine
Wind tunnel experiments are performed to investigate the effect of nacelle-to-rotor size on the wake of a wind turbine under different Reynolds numbers. Four different turbine configurations are tested, which vary in the rotor diameter and nacelle length a ...
2024