Publications related to Manipulating flow separation: sensitivity of stagnation points, separatrix angles and recirculation area to steady actuation

Theoretical and numerical studies of atmospheric boundary-layer flows over complex terrain

Atmospheric boundary-layer (ABL) flows over complex terrain have been the focus of active research, given their impact on weather and climate variability. Surface complexity is understood in a broad sense and includes variation in roughness properties, inc ...

EPFL2016

Wind tunnel study of a vertical axis wind turbine in a turbulent boundary layer flow

Fernando Porté Agel, Vincent François-Charles Rolin

Vertical axis wind turbines (VAWTs) are in a relatively infant state of development when compared to their cousins the horizontal axis wind turbines. Very few studies have been carried out to characterize the wake flow behind VAWTs, and virtually none to o ...

2015

Large-Reynolds-number asymptotics of the streamwise normal stress in zero-pressure-gradient turbulent boundary layers

Peter Monkewitz

A more poetic long title could be 'A voyage from the shifting grounds of existing data on zero-pressure-gradient (abbreviated ZPG) turbulent boundary layers (abbreviated TBLs) to infinite Reynolds number'. Aided by the requirement of consistency with the R ...

Cambridge University Press2015

Large-eddy simulation of atmospheric boundary layer flow and passive scalar dispersion over idealized urban surfaces

Fernando Porté Agel, Wai Chi Cheng

Accurate prediction of atmospheric boundary layer (ABL) flow and its interaction with urban surfaces is critical for understanding the transport of momentum and scalars within and above cities. This, in turn, is essential for predicting the local climate a ...

2015

Too big to grow

Vladislav Mantic Lugo

Open flows, such as wakes, jets, separation bubbles, mixing layers, boundary layers, etc., develop in domains where fluid particles are continuously advected downstream. They are encountered in a wide variety of situations, ranging from nature to technolog ...

EPFL2015

Large-eddy simulation of very-large-scale motions in atmospheric boundary-layer flows

Fernando Porté Agel, Jiannong Fang

In the last few decades, laboratory experiments and direct numerical simulations of turbulent boundary layers, performed at low to moderate Reynolds numbers, have found very-large-scale motions (VLSMs) in the logarithmic and outer regions. The size of VLSM ...

2015

Boundary layer effects on the vortex shedding in a Donaldson-type hydrofoil

François Avellan, Mohamed Farhat, Amirreza Zobeiri, Eduard Egusquiza

Structure Interaction (FSI) phenomena is becoming a relevant study field for the design or revamping of hydropower plants. The generalized trend of increasing flow rates and reducing rotor blades/stay vanes thickness in order to improve the efficiency of t ...

International Association For Hydraulic Research2014

Wind-tunnel experiments of thermally-stratified turbulent boundary layer flow over a wall-mounted 2-D block

Fernando Porté Agel, Wei Zhang, Corey Dean Markfort

Turbulent boundary-layer flows over complex topography have been extensively studied in the atmospheric sciences and wind engineering communities. The upwind turbulence level, the atmospheric thermal stability and the shape of the topography as well as sur ...

2014

Complexity of localised coherent structures in a boundary-layer flow

Tobias Klaus Kreilos

We study numerically transitional coherent structures in a boundary-layer flow with homogeneous suction at the wall (the so-called asymptotic suction boundary layer ASBL). The dynamics restricted to the laminar-turbulent separatrix is investigated in a spa ...

2014

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

Manipulating flow separation: sensitivity of stagnation points, separatrix angles and recirculation area to steady actuation

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Theoretical and numerical studies of atmospheric boundary-layer flows over complex terrain

Wind tunnel study of a vertical axis wind turbine in a turbulent boundary layer flow

Large-Reynolds-number asymptotics of the streamwise normal stress in zero-pressure-gradient turbulent boundary layers

Large-eddy simulation of atmospheric boundary layer flow and passive scalar dispersion over idealized urban surfaces

Too big to grow

Large-eddy simulation of very-large-scale motions in atmospheric boundary-layer flows

Boundary layer effects on the vortex shedding in a Donaldson-type hydrofoil

Wind-tunnel experiments of thermally-stratified turbulent boundary layer flow over a wall-mounted 2-D block

Complexity of localised coherent structures in a boundary-layer flow

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

Large-Reynolds-number asymptotics of the streamwise normal stress in zero-pressure-gradient turbulent boundary layers

Wind tunnel study of a vertical axis wind turbine in a turbulent boundary layer flow

Boundary layer effects on the vortex shedding in a Donaldson-type hydrofoil

Theoretical and numerical studies of atmospheric boundary-layer flows over complex terrain

Wind-tunnel experiments of thermally-stratified turbulent boundary layer flow over a wall-mounted 2-D block

Large-eddy simulation of very-large-scale motions in atmospheric boundary-layer flows

Large-eddy simulation of atmospheric boundary layer flow and passive scalar dispersion over idealized urban surfaces

Too big to grow

Complexity of localised coherent structures in a boundary-layer flow

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