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Publications associées (223)

The role of turbulence in the hydraulic environment of benthic invertebrates

Koen Blanckaert, Ana Margarida Da Costa Ricardo

The role of turbulence in the dislodgment of benthic stream invertebrates from the riverbed was investigated experimentally in a laboratory flume. For the first time, technological advances allowed measuring the spatio-temporal patterns of turbulent flow a ...

Wiley-Blackwell2012

Spatially resolved skin friction velocity measurements using Irwin sensors: A calibration and accuracy analysis

Michael Lehning, Katherine Colby Leonard, Benjamin Andreas Walter

This study investigates the accuracy of spatially resolved skin friction velocity uτ measurements using a large number of Irwin sensors (Irwin, 1981). A fast and simple procedure to calibrate the sensors against a two-component hot-film anemometer is intro ...

2012

Spatially resolved skin friction velocity measurements using Irwin sensors: A calibration and accuracy analysis

Michael Lehning, Katherine Colby Leonard, Benjamin Andreas Walter

This study investigates the accuracy of spatially resolved skin friction velocity ut measurements using a large number of Irwin sensors (Irwin, 1981). A fast and simple procedure to calibrate the sensors against a two-component hot-film anemometer is intro ...

Elsevier2012

The onset of dynamic stall revisited

Karen Ann J Mulleners

Dynamic stall on a helicopter rotor blade comprises a series of complex aerodynamic phenomena in response to the unsteady change of the blade's angle of attack. It is accompanied by a lift overshoot and delayed massive flow separation with respect to stati ...

2012

Flow patterns induced by a bubble screen in a sharply curved flume based on Acoustic Doppler Velocity Profiler measurements

Anton Schleiss, Koen Blanckaert, Violaine Dugué

Open-channel bends are characterized by a bed morphology where erosion occurs near the outer bank and a point bar develops at the inner bend. This morphology is induced by complex interactions between the streamwise flow, the curvature-induced secondary fl ...

2012

Dynamic stall on a fully equipped helicopter model

Karen Ann J Mulleners, Kolja Kindler

Three-dimensional dynamic stall was observed on the rotor of a fully equipped subscale helicopter model in a wind tunnel. Results of stereoscopic particle image velocimetry measurements on the retreating blade clearly revealed the large-scale dynamic stall ...

2012

Algorithmes d'adaptation de maillages anisotropes et application à l'aérodynamique

Wissam Hassan

The goal of this thesis is to study an anisotropic adaptive algorithm for transonic compressible viscous flow around an airwing. A convection-diffusion model problem is considered, an anisotropic a posteriori error estimator for the H1 semi-norm of the err ...

EPFL2012

Experimental Investigation of the Aeroelastic Stability of an Annular Compressor Cascade at Reverse Flow Conditions

Virginie Anne Chenaux

Compressor surge events are unsafe operating regimes yielding highly unsteady flow fields in which complex aeroelastic phenomena occur. If the blade flutter and forced response behaviour (i.e. aeroelastic stability) can be predicted reliably for normal flo ...

EPFL2012

Atmospheric Turbulence Effects on Wind-Turbine Wakes: An LES Study

Fernando Porté Agel, Yu-Ting Wu

A numerical study of atmospheric turbulence effects on wind-turbine wakes is presented. Large-eddy simulations of neutrally-stratified atmospheric boundary layer flows through stand-alone wind turbines were performed over homogeneous flat surfaces with fou ...

Mdpi Ag2012

Viscoplastic dambreak waves: review of simple computational approaches and comparison with experiments

Christophe Ancey, Nicolas Andreini, Gaël Epely Chauvin

We investigated the dam-break problem for Herschel-Bulkley fluids: a fixed volume of a viscoplastic material (a polymeric gel called Carbopol ultrez 10) was released and flowed down an inclined flume. Using Particle Image Velocimetry techniques, we measure ...

Elsevier2012

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