Publications related to Modelling the vertical structure of turbulent free-surface flows over rough permeable beds

Scale Effects in Modelling Two-phase Air-water Flows

Beside analytical approaches, physical modelling represents probably the oldest design tool in hydraulic engineering. For free surface flows, the similitude according to a Froude similarity allows for a correct representation of the dominant forces, namely ...

TPU2013

Forced reattachment in separated flows: a variational approach to recirculation length reduction

François Gallaire, Edouard Boujo

Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region

l_c

is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...

2013

Vegetation establishment in convectively accelerated streams

Paolo Perona, Benoît Crouzy, Peter Molnar

We study the conditions for vegetation establishment within river reaches with converging boundaries. Common to many such rivers worldwide is the existence of a limiting front (e.g., Figure 1a) beyond which all the riverbed vegetation is uprooted by floodi ...

2013

On the longitudinal optimal perturbations to inviscid plane shear flow: formal solution and asymptotic approximation

Cristobal Manuel Arratia Martinez

We study the longitudinal linear optimal perturbations (which maximize the energy gain up to a prescribed time T) to inviscid parallel shear flow, which present unbounded energy growth due to the lift-up mechanism. Using the phase invariance with respect t ...

Cambridge University Press2013

Jets opposing turbidity currents and open channel flows

Anton Schleiss, Christoph Oehy

Hydraulic jumps at the tail end of spillways are usually induced by baffle blocks or other obstacles. Such jumps can also be induced by jets that oppose the main flow. Another application is to back up turbidity currents in reservoirs by means of opposing ...

Asce-Amer Soc Civil Engineers2013

Discussion “Propagation of surge waves in channels with large-scale bank roughness"

Anton Schleiss, Tobias Meile

In open channels, a sudden rise in water elevation generates a positive surge. Positive surges are commonly observed in man-made channels (Bazin 1865, Treske 1994) and a natural occurrence is the tidal bore in macro-tidal estuaries (Tricker 1965, Chanson 2 ...

2013

Hydrodynamic and subdiffusive motion of tracers in a viscoelastic medium

László Forró, Sylvia Jeney, Elena Bertseva

We investigate the diffusive motion of micron-sized spherical tracers in a viscoelastic actin filament network over the time span of 8 orders of magnitude using optical-tweezers single-particle tracking. The hydrodynamic interactions of a tracer with the s ...

Amer Physical Soc2013

Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed

Fereshteh Bagherimiyab Hunkeler

Even though flow in natural rivers and channels is generally unsteady, only a few studies on turbulent structures in unsteady open-channel flows have been carried out. In hydraulic engineering problems, unsteady flow is often approximated with concepts of ...

EPFL2012

Dam Break of Newtonian Fluids and Granular Suspensions

Nicolas Andreini

The objective of this thesis was to increase our understanding of two-phase geophysical flows (e.g. debris flows) by providing velocity profiles in idealized laboratory avalanches. To that end, we developed a new experimental platform made up of an incline ...

EPFL2012

Internal dynamics of Newtonian and viscoplastic fluid avalanches down a sloping bed

Christophe Ancey, Nicolas Andreini, Gaël Epely Chauvin

We experimentally investigated the spreading of fluid avalanches (i.e., fixed volumes of fluid) down an inclined flume. Emphasis was given to the velocity field within the head. Using specific imaging techniques, we were able to measure velocity profiles w ...

2012

Modelling the vertical structure of turbulent free-surface flows over rough permeable beds

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Scale Effects in Modelling Two-phase Air-water Flows

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Vegetation establishment in convectively accelerated streams

On the longitudinal optimal perturbations to inviscid plane shear flow: formal solution and asymptotic approximation

Jets opposing turbidity currents and open channel flows

Discussion “Propagation of surge waves in channels with large-scale bank roughness"

Hydrodynamic and subdiffusive motion of tracers in a viscoelastic medium

Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed

Dam Break of Newtonian Fluids and Granular Suspensions

Internal dynamics of Newtonian and viscoplastic fluid avalanches down a sloping bed

On the longitudinal optimal perturbations to inviscid plane shear flow: formal solution and asymptotic approximation

Scale Effects in Modelling Two-phase Air-water Flows

Jets opposing turbidity currents and open channel flows

Discussion “Propagation of surge waves in channels with large-scale bank roughness"

Hydrodynamic and subdiffusive motion of tracers in a viscoelastic medium

Sediment Suspension Dynamics in Turbulent Unsteady, Depth-Varying Open-Channel Flow over a Gravel Bed

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Vegetation establishment in convectively accelerated streams

Dam Break of Newtonian Fluids and Granular Suspensions

Internal dynamics of Newtonian and viscoplastic fluid avalanches down a sloping bed