Publications associées à Boundary layer thickness

Breaking Size-Segregation Waves in Granular Avalanches

We experimentally prove the existence of the theoretically predicted breaking size-segregation wave within a binary granular avalanche. This complex structure involves the recirculation of particles through a pattern of shocks and rarefaction waves, and ca ...

2014

A numerical study of droplet trapping in microfluidic devices

François Gallaire, Pierre-Thomas Paul Brun, Mathias Nagel

Microfluidic channels are powerful means of control of minute volumes such as droplets. These droplets are usually conveyed at will in an externally imposed flow which follows the geometry of the micro-channel. It has recently been pointed out by Dangla et ...

Amer Inst Physics2014

Silt motion simulation using finite volume particle method

François Avellan, Ebrahim Jahanbakhsh, Christian Vessaz

In this paper, we present a 3-D FVPM which features rectangular top-hat kernels. With this method, interaction vectors are computed exactly and efficiently. We introduce a new method to enforce the no-slip boundary condition. With this boundary enforcement ...

IOP Publishing Ltd2014

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

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

Large-scale Computation of the Pump-Turbine Rotating Stall

François Avellan, Olivier Pacot, Chisachi Kato

The purpose of this paper is to show the feasibility of a large-scale unsteady flow computation. This computation consists in the simulation of the rotating stall appearing into a pump-turbine operating at part load condition (Q/QBEP=76%) in pumping mode. ...

2013

Investigation of droplet shedding in flow focusing geometries using the boundary element method.

François Gallaire, Mathias Nagel

Shedding of droplets in a flow focusing junction is standard technique in two-phase microfluidics. This break-up is driven by a capillary instability. Here we present a depth-averaged approach to simulate these complex phenomena. Since the physical mechani ...

2013

Open-loop control of a separated boundary layer

François Gallaire, Edouard Boujo

Linear optimal gains

G_opt(\omega)

are computed for the separated boundary-layer flow past a two-dimensional bump in the subcritical regime. Very large values are found, making it possible for small-amplitude noise to be strongly amplified and to destabi ...

Cépaduès Editions2013

The Effect of Free-Atmosphere Stratification on Boundary-Layer Flow and Power Output from Very Large Wind Farms

Fernando Porté Agel, Mahdi Abkar

Large-eddy simulation is used to study the influence of free-atmosphere stratification on the structure of atmospheric boundary-layer flow inside and above very large wind farms, as well as the power extracted by the wind turbines. In the simulations, tuni ...

Mdpi Ag2013

Partial slip at fluid-solid boundaries by multiparticle collision dynamics simulations

Giuseppe Foffi, Maxim Belushkin, Samuel Hanot

The understanding of the exact boundary conditions at the interface between a solid and a fluid is becoming increasingly important, as the limitations of the no-slip boundary condition are becoming apparent, especially in micro- and nanofluidics applicatio ...

Royal Soc Chemistry2013

Boundary layer thickness

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Breaking Size-Segregation Waves in Granular Avalanches

A numerical study of droplet trapping in microfluidic devices

Silt motion simulation using finite volume particle method

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

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

Large-scale Computation of the Pump-Turbine Rotating Stall

Investigation of droplet shedding in flow focusing geometries using the boundary element method.

Open-loop control of a separated boundary layer

The Effect of Free-Atmosphere Stratification on Boundary-Layer Flow and Power Output from Very Large Wind Farms

Partial slip at fluid-solid boundaries by multiparticle collision dynamics simulations

Investigation of droplet shedding in flow focusing geometries using the boundary element method.

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

A numerical study of droplet trapping in microfluidic devices

Breaking Size-Segregation Waves in Granular Avalanches

Silt motion simulation using finite volume particle method

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

Large-scale Computation of the Pump-Turbine Rotating Stall

The Effect of Free-Atmosphere Stratification on Boundary-Layer Flow and Power Output from Very Large Wind Farms

Open-loop control of a separated boundary layer

Partial slip at fluid-solid boundaries by multiparticle collision dynamics simulations