Ernesto Horne

Physics research & development

Research interests and expertise:
Quantitative analysis; Scientific modelling; Computational simulations; Signal processing; Machine learning; Team management; Geophysical flows; Remote sensing; Physics in sports.

-> [2022 - ] Senior Research and Development at Teraki GmbH, Berlin.
             Developing models for Advance Driver-Assistance Systems.

->[2021] Junior fellow researcher at Ecole Normale Superieur de Lyon, Lyon.
             Optimizing aerodynamic drag for track cyclists.

-> [2017 - 2020] Junior fellow researcher at Ecole Polytechnique, Paris.
            Statistical behavior of turbulence in geophysical environments.

-> [2016 - 2017] Postdoctoral fellowship at Ecole Centrale de Lyon, Lyon.
            Energy distribution of stratified flows: sorted vs unsorted systems.

-> [2012 - 2015] PhD at Ecole Normale Superieur de Lyon, Lyon.
            Waves and signal analysis in non-isotropic medium.

-> [2006 - 2012] Sci. Physics at University of Buenos Aires. 2012.
            Specialization in direct numerical simulations in continuous mechanics.

Current Research

My current research at Teraki consists of developing ML-based models to improve data quality of remote sensing measurements. In particular, I work towards Advance Driver-Assistance Systems (ADAS) implementation, mostly focused on automotive radar systems and fusion (camera/lidar/GPS/radar) measurements. The understanding of the key physical characteristics of radar sensors allows developing models adapted to the steep improvements in radar technologies.

Former/Ongoing Research

In addition to my current research, I work in searching the optimal conditions for a track cyclist to reduce his aerodynamic drag through the optimal distance between the cyclists and the fabric of their sportswear. This work is done with Philippe Odier as part of the project France 2024, which aims to improve the performance of the French track team in the Olympic Games taking place at Paris in 2024.

I continue to collaborate with subjects such as rotating and stable stratified flows. I worked both, numerical and experimentally, in the question of how the energy is transfer through scales by turbulence in these environments. The main motivation to study this process is given by the fact that both the ocean and the atmosphere are rotating and stratified environments. The multiscale transfer of energy is a key process to improve parametrization of climate model, which need to take into account the physics happening on sub-grid scales. This work is done with Paul Billant and Jean-Marc Chomaz, from LadHyX.

I also work in the study of mixing in stratified turbulence through high resolution DNS with Alex Delache and Louis Gostiaux, from the LMFA at Ecole Centrale de Lyon, and Antoie Venaille from the ENS de Lyon.

I collaborate with my former supervisors Sylvain Joubaud and Philippe Odier in experimental work related to my PhD thesis done at the ENS Lyon. We are working in collaboration with Nelly Pustelnik in developing a variational mode decomposition method for estimating critical reflected internal waves. With Felix Beckebanze we described a theoretical framework for experimental observations of particle transport induced by internal wave beam streaming in lateral boundary layers, in collaboration with Diane Micard.

Detailed research topics

Radar sensors for AD and ADAS

The evolution of Advance Driver and Advance Driver-Assistance Systems relies on the capability to translate complex information of the surroundings of a vehicle into meaningful information. We develop models that interpret radar noisy measurements and transform it into target-recognition, tracking of objects and classification of these objects.


Figure: Multiple sensors identify the surrounding environment of a vehicle, allowing to take the next decision that assures its safety.

Aerodynamics of track cycling

The optimal distance between cyclists is a key characteristics for track racing to avoid accidents and reduce the surface drag generated at high speeds. We studied the connection between cyclist-distance and power injected by the cyclist to analyse the best possible strategy in races. In addition, the texture of the sport-fabric plays a fundamental role in the drag-surface. We perform wind-tunnel measurements over many sport-fabrics to adapt the sportwear according to the part of the body that is covered and the typical speed of the cyclist. The project aims to produce a qualitative improvement in the performance of the french track team in the Olympic games taking place at Paris in 2024.


Figure: (Left) team aligned to reduce air drag. (Right) Different textures in fabric have different effects on surface-drag.

Energy cascade in stratified and rotating flows

Turbulence in the ocean and atmosphere is dominated by stratification and rotation. Understanding how the energy is transported from large eddies to the small dissipative scales would improve the modeling of the unresolved scales in meteorological and oceanic models. We use a stratified tank set on a rotating table and direct numerical simulations to study stratified and rotating turbulence. The turbulence is produced by the interaction of multiple columnar vortices.


Figure: Evolution of the vertical vorticity field obtained from numerical simulations.

The combination of stratification and rotation produces a particular type of turbulence, with a dual cascade of energy towards the large scales and small scales where the energy is dissipated. The eddies are large (see horizontal plane) but with a small thickness that induces strong shear and the formation of small scales (see vertical plane).

Turbulence mixing in high resolution DNS

Stratified fluids are common to many geophysical and industrial environments. The dynamics of these systems are driven by the complex balance between turbulent decay, buoyancy restoring force and irreversible mixing ; where the local mixing can produce an effect in the global energy budget of the system.


Figure: Snapshot of a 3D buoyancy field of a turbulent decaying flow with initial linear stratification.

In particular, turbulent mixing in the ocean interior plays a crucial role in its global energy budget. This mixing partially drives large scale dynamics, as evidenced in the meridional overturning circulation (Wunsch and Ferrari (2004)). In addition, vertical transport in the ocean is substantial for sequestering large quantities of dissolved greenhouse gases from the atmosphere to the deep ocean. The proportion of energy transferred from turbulent structures to effective mixing is very difficult to estimate through observations (Ivey et al. (2008)). Through measurements in well controlled environements we were able to give better estimation of these quantities.

Internal gravity waves

When difference of density exists within a fluid, it will tend to redistribute driven by the force of gravity so that the lighter fluid remains above the heavier forming a stable stratification profile. This particular configuration will be stable in time and if not perturbed, static. When the fluid is slightly vertically displaced, it will feel a buoyancy restoring force acting in a direction opposite to the displacement. The force will act as a spring, and therefore the fluid will oscillate around an equilibrium position. These oscillations are know as internal gravity waves, which differ from the well known surface waves, as they occur inside the fluid where the density of the fluid changes continuously.
The atmosphere is stratified in temperature, and the ocean is stratified in both salinity and temperature. The main motivation for understanding the dynamics of internal gravity waves is that they occur naturally in these systems. These waves have an effect over the dynamics of stratify systems, and may be taken into account to be able to better predict large scale effects such as transport of energy and matter.

Watch a video of an internal plane wave propagating in experimental conditions here.

Internal waves near-critical reflection

Watch a video of an internal wave near-critical reflection in experimental conditions here.


Figure : Velocity field of an internal wave near-critical reflection. The incident wave is coming from left to right, and the generator is located 30 cm from the center of the image.

The peculiar dispersion relation and the nonintuitive relation between group velocity and the wavenumber of internal gravity waves lead to some very unusual physical consequences. In particular, when internal waves are reflected on a sloped boundary the frequency is conserved, and therefore, its angle of propagation. In consequence, nonintuitive effects including reflection, focalization and wave attractors will emerge when internal waves interact with boundaries.

The detailed study of this process is principally motivated by the peculiar characteristics of internal waves reflection that can enhance the shear stress developed near boundaries and therefore generate erosion of particles settle at a boundary.

Many observational studies have been done that indicate that internal gravity waves are a cause of sediment resuspension, as for example Bogucki et al 1997., Quaresma et al. 2007 and Hosegood & van Haren 2004. In every case the capacity of generating sediment transport through the interaction of internal waves over the seafloor is limited by the shear stress generated at the boundary and the physical characteristics of the particles

Transport of particles by internal gravity waves

Oscillating column

Find a video here


Figure : Internal waves passing through a column of particles in suspension. The boundaries of the column are perturbed by the pass of the wave.

Displaced column


Figure : Snapshots of the front view of a column of particles in suspension in a linear stratified fluid. Time evolves from up-left to down-right. The snapshots are taken every 5 periods of the internal waves (T=25 s). The wave generator is turned on for the first snapshot. With blue dashed lines is indicated the borders of the wave beam. The column is displaced towards the wave generator.


In progress

E. Horne, A. Delache, A. Venaille, L. Gostiaux. Mixing efficiency and partition of energy in decaying stratified turbulence.

E. Horne, P. Billant. Energy transfer in rotating and stratified turbulence.


E. Horne, J. Schmitt, N. Pulstelnyk, S. Joubaud, P. Odier. Variational Mode Decomposition for estimating critical reflected internal wave in stratified fluid. Exp Fluids 62, 110 (2021). [DOI] . [Arxiv]. [PDF].

E. Horne, F. Beckebanze, D. Micard, P. Odier, Leo Maas, S. Joubaud. Particle transport induced by internal wave beam streaming in lateral boundary layers. Journal of Fluid Mechanics, Vol 870, p 848–869. 2019 [DOI]. Arxiv: [PDF] .

E. Horne, A. Delache, L. Gostiaux, A. Venaille. Irreversible mixing and energetic aspects of turbulent stratified flow. 16th European Turbulence Conference, Stockholm, Sweden. Aug. 2017. [PDF]

F. Beckebanze, E. Horne, Leo Maas. Mass transport generated by stratified internal wave boundary layers. 4th International Symposium of Shallow Flows, Eindhoven University of Technology. June 2017. [PDF]

E. Horne, A. Delache, L. Gostiaux, A. Venaille. Mélange irréversible et aspect énergétique de la turbulence stratifié. 23 eme Congres Francais de Mécanique, Lille, France. Sept. 2017. [PDF]

E. Horne, A. Delache, L. Gostiaux. Energetics aspects in Direct Numerical Simulations of a turbulent stratified flow: irreversible mixing. VIIIth International Symposium on Stratified Flows. San Diego. Aug. 2016. [PDF]

E. Horne, D. Micard, P. Metz, M. Moulin, P. Odier, S. Joubaud. Transport de particules par ondes internes. Rencontre du non-linéaire. Paris. Mar. 2016. [PDF]

J. Schmitt, E. Horne, N. Pulstelnyk, S. Joubaud, P. Odier. An improved variational mode decomposition method for internal waves separation. Eusipco, Nice. 2015 [DOI] . [PDF].

E. Horne and P. Mininni. Sign cancellation and scaling in the vertical component of velocity and vorticity in rotating turbulence. Physical Review E. 2013, 88, 013011. [PDF] .

C. Bengoa, E. Horne, T. A. Caselli and J. M. Ibanez. Seismic activity of Copahue volcano zone, Copahue, Neuquen, Argentine: High and low frequency events. Conference: XI International Meeting of Volcan de Colima., At Colima, Mexico. 2009.

PhD and master thesis

E. Horne Transport properties of internal gravity waves. Laboratoire de Physique, Ecole Normale Superieur de Lyon, France. Oct. 2015. [PDF]. Supervisor: S. Joubaud, P. Odier.

E. Horne Exponente de cancelacion en fujos turbulentos rotantes. Physics Department, University of Buenos Aires, Argentina. Jul. 2012. [PDF]. Supervisor: P. Mininni.

Oral presentations

E. Horne, M. Cassol. Enhancing radar detections through machine learning​. Webinar in collaboration between Teraki and Infineon. Berlin, Germany, Jan., 2023.

E. Horne, P. Billant, J-M Chomaz. Upward and downward transfer of energy in rotating stratified flows. 72nd APS Division of Fluid Dynamics, Seattle, USA, Nov., 2019.

E. Horne, P. Billant, J-M Chomaz. Turbulence produced by columnar dipoles in a stratified and rotating fluid. 12th European Fluid Mechanics Conference, Vienne, Austria. Aug., 2018.

E. Horne, A. Delache, L. Gostiaux. Irreversible mixing in stratified turbulence. Seminar at the Institute for Marine and Atmospheric Research. Utercht University, Netherlands. Jul., 2018.

E. Horne, A. Delache, L. Gostiaux. Energetics aspects and irreversible mixing in stratified turbulence: numerical study. Seminar at Geophysics department of ENS, Paris, France. Dec., 2017.

E. Horne, L. Gostiaux, A. Delache. Irreversible mixing and energetic aspects of Direct Numerical Simulations of turbulent stratified flows. Seminar at IRPHE Laboratory, Marseille, France. Jul, 2017.

E. Horne, J. Schmitt, N. Pustelnik, S. Joubaud, P. Odier. An improved variational mode decomposition method for internal waves separation. MSD2017 : Matiere : structure et dynamique, Lyon, France. Jul., 2017.

E. Horne, A. Delache, L. Gostiaux. Energetics aspects in Direct Numerical Simulations of a turbulent stratified flow: irreversible mixing. VIIIth International Symposium on Stratified Flows, San Diego, USA. Sept, 2017.

E. Horne, D. Micard, S. Joubaud, P. Odier. Internal waves interacting with particles in suspension. International Congress of Theoretical and Applied Mechanics, Montreal, Canada. Aug., 2016.

E. Horne, S. Joubaud, P. Odier. Experimental studies of resuspension in near critical internal wave reflection. Fluid Dynamics of Sustainability and the Environment, Cambridge, UK. Sept., 2014.

E. Horne, S. Joubaud, P. Odier. Experimental non-linear reflection of internal waves. Nonlinear Effects In Internal Waves, Cornell University, Ithaca, USA, month, Jun., 2014.

E. Horne, S. Joubaud, P. Odier. Interaction between internal gravity waves and sediment. Aux Rencontres de Peyresq 2013 Morphogenése, forces, formes et non linéarités, Peyresq, Provence-Alpes-Côte d’Azur, France. Jun., 2013.


Environmental hydrodynamics with J.-M. Chomaz (Master 1 course), École Polytechnique, France.

Exercises (in french)

porous media surface waves internal waves waves refraction tides turbulence

Internship supervision

2015: Master 2 internship of Diane Micard, Ecole Normale de Lyon, France.

2019: Master 2 internship of M. H. Hamede, Ecole Polytechnique, France.

Field campaigns

Jan-Mar 2009. Antarctic campaign, Deception Island, Antarctica. Study of permafrost measurements and frozen core extraction.

2008-2010. Copahue volcano. Copahue, Neuquen, Argentine. Multiple campaigns for installation, maintenance and removal of seismic equipment, as well as data gathering.

2008-2010. Lanin volcano, Lanin National Park, Neuquen, Argentine. Multiple campaigns for installation, maintenance and removal of seismic equipment, as well as data gathering.

Jun- Ago 2009. Transatlantic: Transat (d'Ushuaia a La Rochelle), Argentine-France. Preparation for Mini Transat 2009 sailing course as support boat, with skipper Brice Monegier du Sorbier and crew. Voile-austral.

2008. Copahue volcano. Copahue, Neuquen, Argentine. Study and localization of deep structure magmatic camera through magnetotelluric techniques.


You can find my curriculum vitae



My e-mail

ernehorne [at]

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