Publications related to Turbulent patterns in wall-bounded shear flows: invariant solutions and their bifurcations

On the density of shear transformations in amorphous solids

We study the stability of amorphous solids, focussing on the distribution P(x) of the local stress increase x that would lead to an instability. We argue that this distribution behaves as , where the exponent θ is larger than zero if the elastic interactio ...

EDP Sciences2014

Second-order sensitivity of parallel shear flows and optimal spanwise-periodic flow modifications

François Gallaire, Edouard Boujo, Andrea Fani

We perform a second-order sensitivity analysis of the linear temporal stability of a parallel flow subject to small spanwise periodic modification. The need for a second-order analysis results from the fact that spanwise-periodic flow modifications have a ...

2014

Floquet theory for seasonal environmental forcing of spatially explicit waterborne epidemics

Andrea Rinaldo, Enrico Bertuzzo, Lorenzo Mari, Marino Gatto

The transmission of waterborne pathogens is a complex process that is heavily linked to the spatial characteristics of the underlying environmental matrix as well as to the temporal variability of the relevant hydroclimatological drivers. In this work, we ...

Springer Heidelberg2014

Dynamical Movement Primitives: Learning Attractor Models for Motor Behaviors

Auke Ijspeert

Nonlinear dynamical systems have been used in many disciplines to model complex behaviors, including biological motor control, robotics, perception, economics, traffic prediction, and neuroscience. While often the unexpected emergent behavior of nonlinear ...

Massachusetts Institute of Technology Press2013

Edge states for the turbulence transition in the asymptotic suction boundary layer

Tobias Schneider, Tobias Klaus Kreilos

We demonstrate the existence of an exact invariant solution to the Navier-Stokes equations for the asymptotic suction boundary layer. The identified periodic orbit with a very long period of several thousand advective time units is found as a local dynamic ...

Cambridge University Press2013

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

A General Family of Morphed Nonlinear Phase Oscillators with Arbitrary Limit Cycle Shape

Auke Ijspeert, Mostafa Ajallooeian, Jesse van den Kieboom

We present a general family of nonlinear phase oscillators which can exhibit arbitrary limit cycle shapes and infinitely large basins of attraction. This general family is the superset of familiar control methods like PD-control over a periodic reference, ...

Elsevier Science Bv2013

Open-loop control of noise amplification in separated boundary layers

François Gallaire, Edouard Boujo

Linear optimal gains are computed for the subcritical two-dimensional separated boundary-layer flow past a bump. Very large optimal gain values are found, making it possible for small-amplitude noise to be strongly amplified and to destabilize the flow. Th ...

2013

From standing to breaking antidunes, a Hopf bifurcation.

Christophe Ancey, Joris Heyman, François Mettra

Antidunes are bed morphologies often observed in steep slope mountain flows but also in small streams flowing on a sand beach. Linear stability analysis of the shallow water equations (SWE), when coupled to a sediment transport equation, predicts the growt ...

2013

Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects

John Richard Thome, Navid Borhani, Marco Milan

Flow patterns for adiabatic vertical downward air water flow in an 8.8 mm diameter channel have been studied. In particular, the influence of the inlet device, the flow history and the development length on the flow pattern have been investigated and asses ...

Elsevier2013

Turbulent patterns in wall-bounded shear flows: invariant solutions and their bifurcations

Graph Chatbot

Chat with Graph Search

On the density of shear transformations in amorphous solids

Second-order sensitivity of parallel shear flows and optimal spanwise-periodic flow modifications

Floquet theory for seasonal environmental forcing of spatially explicit waterborne epidemics

Dynamical Movement Primitives: Learning Attractor Models for Motor Behaviors

Edge states for the turbulence transition in the asymptotic suction boundary layer

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

A General Family of Morphed Nonlinear Phase Oscillators with Arbitrary Limit Cycle Shape

Open-loop control of noise amplification in separated boundary layers

From standing to breaking antidunes, a Hopf bifurcation.

Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects

On the density of shear transformations in amorphous solids

Floquet theory for seasonal environmental forcing of spatially explicit waterborne epidemics

Second-order sensitivity of parallel shear flows and optimal spanwise-periodic flow modifications

Dynamical Movement Primitives: Learning Attractor Models for Motor Behaviors

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

Edge states for the turbulence transition in the asymptotic suction boundary layer

A General Family of Morphed Nonlinear Phase Oscillators with Arbitrary Limit Cycle Shape

Adiabatic vertical downward air-water flow pattern map: influence of inlet device, flow development length and hysteresis effects

Open-loop control of noise amplification in separated boundary layers

From standing to breaking antidunes, a Hopf bifurcation.