Publications related to Revisiting the quest for a universal log-law and the role of pressure gradient in "canonical" wall-bounded turbulent flows

Impact of surface roughness on the turbulent wake flow of a turbine blade

Roughened aeroengine blade surfaces lead to increased friction losses and reduced efficiency of the individual blades. The surface roughness also affects the wake flow of the blade and thus the inflow conditions for the subsequent compressor or turbine sta ...

2014

Comoving frames and symmetry-related motions in parallel shear flows

Tobias Klaus Kreilos

Parallel shear flows have continuous symmetries of translation in the downstream and spanwise directions. As a consequence, flow states that differ in their spanwise or downstream location but are otherwise identical are dynamically equivalent. In the case ...

2014

Shear velocity estimates in rough-bed open-channel flow

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

Shear velocity u(*) is an important parameter in geophysical flows, in particular with respect to sediment transport dynamics. In this study, we investigate the feasibility of applying five standard methods [the logarithmic mean velocity profile, the Reyno ...

Wiley-Blackwell2013

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

High Voltage Pulsed DBD Effects on the Aerodynamic Performances and on the Shock Buffet

Christoph Hollenstein, Peter Ott, Pénélope Leyland, Philip Peschke

The applications of surface dielectric barrier discharge plasma actuators, (DBD), have known a considerable interest recently in the field of flow control. In general, such actuators consist of two electrodes separated by an insulation covering the lower e ...

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

Influence of confinement on obstacle-free turbulent wakes

François Gallaire, Luca Biancofiore

Large-eddy simulations (LESs) of obstacle-free wakes, in a channel like geometry with an homogeneous transverse direction, are carried out in order to investigate the influence of confinement on turbulent wakes. The numerical solver makes use of a multi-do ...

Elsevier2012

Optimal open-loop control of the recirculation length in the wake of a cylinder

François Gallaire, Edouard Boujo

We consider steady equilibrium solution of the 2-D Navier-Stokes equations describing the flow around a circular cylinder. It is well known that, for moderate Reynolds numbers, the recirculation length is an increasing function of the Reynolds number. We f ...

2012

The Effects of a Tripped Turbulent Boundary Layer on Vortex Shedding from a Blunt Trailing Edge Hydrofoil

François Avellan, Mohamed Farhat, Philippe Ausoni, Amirreza Zobeiri

Experiments on vortex shedding from a blunt trailing edge symmetric hydrofoil operating at zero angle of attack in a uniform high speed flow, Re-h = 16.1 . 10(3) - 96.6 . 10(3), where the reference length h is the trailing edge thickness, are reported. The ...

2012

A theory for the streamwise turbulent fluctuations in high Reynolds number pipe flow

A new theory for the streamwise turbulent fluctuations in fully developed pipe flow is proposed. The theory extends the similarities between the mean flow and the streamwise turbulence fluctuations, as observed in experimental high Reynolds number data, to ...

Cambridge University Press2012

Revisiting the quest for a universal log-law and the role of pressure gradient in "canonical" wall-bounded turbulent flows

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Impact of surface roughness on the turbulent wake flow of a turbine blade

Comoving frames and symmetry-related motions in parallel shear flows

Shear velocity estimates in rough-bed open-channel flow

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

High Voltage Pulsed DBD Effects on the Aerodynamic Performances and on the Shock Buffet

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

Influence of confinement on obstacle-free turbulent wakes

Optimal open-loop control of the recirculation length in the wake of a cylinder

The Effects of a Tripped Turbulent Boundary Layer on Vortex Shedding from a Blunt Trailing Edge Hydrofoil

A theory for the streamwise turbulent fluctuations in high Reynolds number pipe flow

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

High Voltage Pulsed DBD Effects on the Aerodynamic Performances and on the Shock Buffet

Impact of surface roughness on the turbulent wake flow of a turbine blade

Comoving frames and symmetry-related motions in parallel shear flows

Shear velocity estimates in rough-bed open-channel flow

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

Influence of confinement on obstacle-free turbulent wakes

Optimal open-loop control of the recirculation length in the wake of a cylinder

The Effects of a Tripped Turbulent Boundary Layer on Vortex Shedding from a Blunt Trailing Edge Hydrofoil

A theory for the streamwise turbulent fluctuations in high Reynolds number pipe flow