Publications related to Invariant solutions underlying small- and large-scale structures in turbulent boundary layers

An intercomparison of subgrid models for large-eddy simulation of katabatic flows

Fernando Porté Agel, Craig Matthew Smith

We present an intercomparison of three subgrid-scale (SGS) models for large-eddy simulation (LES) of katabatic flows. The SGS closures we study include the Smagorinsky formulation, a scale-invariant dynamic model, and a scale-dependent dynamic model. Downs ...

Wiley-Blackwell2014

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

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

Fernando Porté Agel, Wai Chi Cheng

Large-eddy simulations of flow past a two-dimensional (2D) block were performed to evaluate four sub-grid-scale (SGS) models: (i) the traditional Smagorinsky model, (ii) the Lagrangian dynamic model, (iii) the Lagrangian scale-dependent dynamic model, and ...

Elsevier2013

Hydraulic design of the diaphragm’s orifice at the entrance of the surge shaft of FMHL pumped-storage power plant

Giovanni De Cesare, Christophe Nicolet, Fadi Hachem, Rafael Xavier Meriade Duarte

The surge tank located at the upstream head of penstocks and shafts of hydropower plants is an effective measure to protect the headrace tunnels against high pressure fluctuations. It reflects the transient pressure waves that are generated by the variatio ...

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

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

A New Sensor Platform for Investigating Turbulence in Stratified Coastal Environments

Ulrich Lemmin, Damien Bouffard

Characterizing and quantifying vertical exchange processes is essential for understanding physical and biological dynamics in stratified lakes and oceans. Unfortunately, the role of mixing is still poorly understood because of the challenges of conducting ...

American Meteorological Society2013

Localized edge states in the asymptotic suction boundary layer

Tobias Klaus Kreilos

The dynamics on the laminar-turbulent separatrix is investigated numerically for boundary-layer flows in the subcritical regime. Constant homogeneous suction is applied at the wall, resulting in a parallel asymptotic suction boundary layer (ASBL). When the ...

2013

Large Eddy Simulation of Particle Dynamics Inside a Differentially Heated Cavity

Christoph Bosshard

In nuclear safety, most severe accident scenarios lead to the presence of fission products in aerosol form in the closed containment atmosphere. It is important to understand the particle depletion process to estimate the risk of a release of radioactivity ...

EPFL2012

Invariant solutions underlying small- and large-scale structures in turbulent boundary layers

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An intercomparison of subgrid models for large-eddy simulation of katabatic flows

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

Large-scale Computation of the Pump-Turbine Rotating Stall

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

Hydraulic design of the diaphragm’s orifice at the entrance of the surge shaft of FMHL pumped-storage power plant

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

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

A New Sensor Platform for Investigating Turbulence in Stratified Coastal Environments

Localized edge states in the asymptotic suction boundary layer

Large Eddy Simulation of Particle Dynamics Inside a Differentially Heated Cavity

An intercomparison of subgrid models for large-eddy simulation of katabatic flows

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

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

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

Hydraulic design of the diaphragm’s orifice at the entrance of the surge shaft of FMHL pumped-storage power plant

Large-scale Computation of the Pump-Turbine Rotating Stall

Evaluation of subgrid-scale models in large-eddy simulation of flow past a two-dimensional block

A New Sensor Platform for Investigating Turbulence in Stratified Coastal Environments

Localized edge states in the asymptotic suction boundary layer

Large Eddy Simulation of Particle Dynamics Inside a Differentially Heated Cavity