41 citations · 195 across the 18 of their papers we have counts for
21 papers
Sidewall effects on the onset of interfacial Holmboe waves in stratified exchange flows at high Schmidt number
Guilherme Siqueira de Aquino, Metten M. de Lange, Adrien Lefauve +1
Predicting the onset of interfacial instabilities is central to understanding turbulent mixing in natural and engineered stratified shear flows. Here, we study the onset of travell…
Early onset of secondary shear instability in Kelvin-Helmholtz braids at high Reynolds number
Emma R. Bouckley, Sam F. Lewin, Adrien Lefauve
We study the onset of two-dimensional secondary shear instability (SSI) in the braid regions connecting primary Kelvin-Helmholtz billows in stratified shear flows. While strain ind…
Transition to the ultimate regime of turbulent convection in stratified inclined duct flow
Rundong Zhou, Adrien Lefauve, Roberto Verzicco +1
The stratified inclined duct (SID) flow provides a canonical model for sustained, buoyancy-driven exchange between two reservoirs of different density, and emerges as a new paradig…
Routes to stratified turbulence and temporal intermittency revealed by a cluster-based network model of experimental data
Adrien Lefauve, Yui Hin Marvil Cheung, Xianyang Jiang +1
Modelling fluid turbulence using a `skeleton' of coherent structures has traditionally progressed by focusing on a few canonical laboratory experiments such as pipe flow and Taylor…
Boiling stratified flow: a laboratory analogy for atmospheric moist convection
Hao Fu, Claudia Cenedese, Adrien Lefauve +1
We present a novel laboratory experiment, boiling stratified flow, as an analogy for atmospheric moist convection. A layer of diluted syrup is placed below freshwater in a beaker a…
Physics-informed neural network to augment experimental data: an application to stratified flows
Lu Zhu, Xianyang Jiang, Adrien Lefauve +2
We develop a physics-informed neural network (PINN) to significantly augment state-of-the-art experimental data and apply it to stratified flows. The PINN is a fully-connected deep…
Geometry of stratified turbulent mixing: local alignment of the density gradient with rotation, shear and viscous dissipation
Xianyang Jiang, Amir Atoufi, Lu Zhu +4
We introduce a geometric analysis of turbulent mixing in density-stratified flows based on the alignment of the density gradient in two orthogonal bases that are locally constructe…
Long-wave instabilities of sloping stratified exchange flows
Lu Zhu, Amir Atoufi, Adrien Lefauve +2
We investigate the linear instability of two-layer stratified shear flows in a sloping two-dimensional channel, subject to non-zero longitudinal gravitational forces. We reveal thr…
Routes to stratified turbulence revealed by unsupervised classification of experimental data
Adrien Lefauve, Miles M. P. Couchman
Modeling fluid turbulence using a 'skeleton' of coherent structures has traditionally progressed by focusing on a few canonical experiments, such as pipe flow and Taylor-Couette fl…
Data-driven classification of sheared stratified turbulence from experimental shadowgraphs
Adrien Lefauve, Miles M. P. Couchman
We propose a dimensionality reduction and unsupervised clustering method for the automatic classification and reduced-order modeling of density-stratified turbulence in laboratory…
Stratified inclined duct: two-layer hydraulics and instabilities
Amir Atoufi, Lu Zhu, Adrien Lefauve +5
The stratified inclined duct (SID) sustains an exchange flow in a long, gently sloping duct as a model for continuously-forced density-stratified flows such as those found in estua…
Stratified inclined duct: direct numerical simulations
Lu Zhu, Amir Atoufi, Adrien Lefauve +5
The stratified inclined duct (SID) experiment consists of a zero-net-volume exchange flow in a long tilted rectangular duct, which allows the study of realistic stratified shear fl…
The evolution of coherent vortical structures in increasingly turbulent stratified shear layers
Xianyang Jiang, Adrien Lefauve, Stuart B. Dalziel +1
We study the morphology of Eulerian vortical structures and their interaction with density interfaces in increasingly turbulent stably-stratified shear layers. We analyse the three…
The effects of spanwise confinement on stratified shear instabilities
Yves-Marie Ducimetière, François Gallaire, Adrien Lefauve +1
We consider the influence of transverse confinement on the instability properties of velocity and density distributions reminiscent of those pertaining to exchange flows in stratif…
Reynolds stresses in Holmboe instabilities: from linear growth to saturation
Adam J. K. Yang, E. W. Tedford, J. Olsthoorn +2
The Reynolds stress in Holmboe instabilities at moderate Reynolds numbers is investigated using single wavelength simulations (SWS), multiple wavelength simulations (MWS), and labo…
Experimental properties of continuously-forced, shear-driven, stratified turbulence. Part 1. Mean flows, self-organisation, turbulent fractions
Adrien Lefauve, P. F. Linden
We study the experimental properties of exchange flows in a stratified inclined duct (SID), which are simultaneously turbulent, strongly stratified by a mean vertical density gradi…
Experimental properties of continuously-forced, shear-driven, stratified turbulence. Part 2. Energetics, anisotropy, parameterisation
Adrien Lefauve, P. F. Linden
In this Part 2 we study further experimental properties of two-layer exchange flows in a stratified inclined duct (SID), which are turbulent, strongly-stratified, shear-driven, and…
Buoyancy-driven exchange flows in inclined ducts
Adrien Lefauve, P. F. Linden
Buoyancy-driven exchange flows arise in the natural and built environment wherever bodies of fluids at different densities are connected by a narrow constriction. In this paper we…
Regime transitions and energetics of sustained stratified shear flows
A. Lefauve, J. L. Partridge, P. F. Linden
We describe the long-term dynamics of sustained stratified shear flows in the laboratory. The Stratified Inclined Duct (SID) experiment sets up a two-layer exchange flow in an incl…
A versatile scanning method for volumetric measurements of velocity and density fields
J. L. Partridge, A. Lefauve, Stuart B. Dalziel
Understanding turbulence in a stratified environment requires a detailed picture of both the velocity field and the density field. Experimentally, this represents a significant mea…
Globally aligned states and hydrodynamic traffic jams in confined active suspensions
Adrien Lefauve, David Saintillan
Strongly confined active liquids are subject to unique hydrodynamic interactions due to momentum screening and lubricated friction by the confining walls. Using numerical simulatio…