Unit
Emergent Complexity in Physical Systems
LaboratoryRelated publications (40)
On the Capability of Wall-Modeled Large Eddy Simulations to Predict Particle Dispersion in Complex Turbulent Flows
Mohamed Aly Hashem Mohamed Sayed
Predicting particle transport in turbulent flows has a plethora of applications, some of which are: the transport of atmospheric aerosols, the deposition of blood cells in the arteries of human bodies and the atomization of fuel droplets in combustion cham ...
EPFL2022Invariant tori in dissipative hyperchaos
Tobias Schneider, Jeremy Peter Parker
One approach to understand the chaotic dynamics of nonlinear dissipative systems is the study of non-chaotic yet dynamically unstable invariant solutions embedded in the system's chaotic attractor. The significance of zero-dimensional unstable fixed points ...
AIP Publishing2022Constructing periodic orbits of high-dimensional chaotic systems by an adjoint-based variational method
Tobias Schneider, Sajjad Azimi, Omid Ashtari
Chaotic dynamics in systems ranging from low-dimensional nonlinear differential equations to high-dimensional spatiotemporal systems including fluid turbulence is supported by nonchaotic, exactly recurring time-periodic solutions of the governing equations ...
2022From coating flow patterns to porous body wake dynamics via multiscale models
Multiscale phenomena are involved in countless problems in fluid mechanics. Coating flows are known to exhibit a broad variety of patterns, such as wine tears in a glass and dripping of fresh paint applied on a wall. Coating flows are typically modeled und ...
EPFL2022Periodic orbits exhibit oblique stripe patterns in plane Couette flow
Tobias Schneider, Florian Reetz
Spatiotemporally chaotic dynamics of transitional plane Couette flow may give rise to regular turbulent-laminar stripe patterns with a large-scale pattern wavelength and an oblique orientation relative to the laminar flow direction. A recent dynamical syst ...
AMER PHYSICAL SOC2021Invariant solutions underlying small- and large-scale structures in turbulent boundary layers
Flows of gases and liquids interacting with solid objects are often turbulent within a thin boundary layer. As energy dissipation and momentum transfer are dominated by the boundary layer dynamics, many engineering applications can benefit from an improved ...
EPFL2020Invariant states in inclined layer convection. Part 1. Temporal transitions along dynamical connections between invariant states
Tobias Schneider, Florian Reetz
Thermal convection in an inclined layer between two parallel walls kept at different fixed temperatures is studied for fixed Prandtl number . Depending on the angle of inclination and the imposed temperature difference, the flow exhibits a large variety of ...
CAMBRIDGE UNIV PRESS2020Turbulent patterns in wall-bounded shear flows: invariant solutions and their bifurcations
When laminar shear flows in large wall-bounded domains transition to turbulence, the flow exhibits spatio-temporally chaotic dynamics. Despite its chaotic dynamics, the flow may self-organize into characteristic spatially periodic patterns of unknown origi ...
EPFL2019Turbulent Flows over Rough Permeable Beds in Mountain Rivers: Experimental Insights and Modeling
Gauthier Paul Daniel Marie Rousseau
Steep mountain streams exhibit shallow waters with roughness elements such as stones and pebbles that are comparable in size to flow depth. Owing to the difficulty in measuring fluid velocities at the interface, i.e., from the rough permeable bed to the fr ...
EPFL2019Identification of a Predator-Prey System from Simulation Data of a Convection Model
The use of low-dimensional dynamical systems as reduced models for plasma dynamics is useful as solving an initial value problem requires much less computational resources than fluid simulations. We utilize a data-driven modeling approach to identify a red ...
American Institute of Physics2017