Publications related to The effect of rounding corners or cutting edges on the absolute/convective instability properties of mixing layers

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

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

Stability of a Double-Diffusive Interface in the Diffusive Convection Regime

Alfred Johny Wüest

In this paper, the authors explore the conditions under which a double-diffusive interface may become unstable. Focus is placed on the case of a cold, freshwater layer above a warm, salty layer [i.e., the diffusive convection (DC) regime]. The "diffusive i ...

Amer Meteorological Soc2012

Atmospheric Boundary Layer Dynamics of Transitional Flows over Complex Terrain

Daniel Nadeau

Recent advances in boundary-layer meteorology are beginning to allow the study of atmospheric flow phenomena that have previously been poorly understood. In this dissertation, we study the effects of complex terrain and unsteady regimes on the atmospheric ...

EPFL2011

The influence of shear layer thickness on the stability of confined two-dimensional wakes

François Gallaire, Luca Biancofiore

The influence of confinement onto the inviscid and incompressible linear stability of the family of wakes introduced by Monkewitz [Phys. Fluids 31, 999 (1988)] is examined. The nondimensional parameters of the model, the velocity ratio Λ, defined as ratio ...

2011

Boundary mixing in lakes: 2. Combined effects of shear- and convectively induced turbulence on basin-scale mixing

Alfred Johny Wüest

A detailed comparison of results from a numerical three-dimensional hydrostatic lake model with high-resolution observations of the vertical structure of the turbulent bottom boundary layer (BBL) in a medium-size lake (Lake Alpnach, Switzerland) is provide ...

Amer Geophysical Union2011

A Simple Model for the Afternoon and Early-Evening Decay of Turbulence over Different Land Surfaces

Marc Parlange, Chad Higgins, Eric Richard Pardyjak, Daniel Nadeau

Recent years have seen an increasing interest in the late-afternoon transition between the convective and stable regimes of the atmospheric boundary layer. There are several differences between the two regimes. On one hand, the convective boundary layer is ...

2010

A Simple Model for the Afternoon and Early-Evening Decay of Turbulence over Different Land Surfaces

Marc Parlange, Chad Higgins, Eric Richard Pardyjak, Daniel Nadeau

Recent years have seen an increasing interest in the late-afternoon transition between the convective and stable regimes of the atmospheric boundary layer. There are several differences between the two regimes. On one hand, the convective boundary layer is ...

2010

Atmospheric Boundary-Layer Dynamics with Constant Bowen Ratio

Motivated by the observation that the diurnal evolution of sensible and latent heat fluxes tends to maintain a constant Bowen ratio, we derive approximate solutions of the ordinary differential equations of a simplified atmospheric boundary-layer (ABL) mod ...

Springer Netherlands2009

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Ismail Albayrak

River and open-channel flows are free surface boundary layer flows with complex 3D, large-scale, turbulent structures. The study of 2D and 3D large-scale turbulent flow structures is a great challenge for physicists, mathematicians and engineers from such ...

EPFL2008

Near-field flow structure of a confined wall jet on flat and concave rough walls

Ulrich Lemmin, Ismail Albayrak

Experimental results are presented of the mean flow and turbulence characteristics in the near field of a plane wall jet issuing from a nozzle onto flat and concave walls consisting of fixed sand beds. This is a flow configuration of interest for sediment ...

Cambridge University Press2008

The effect of rounding corners or cutting edges on the absolute/convective instability properties of mixing layers

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

Stability of a Double-Diffusive Interface in the Diffusive Convection Regime

Atmospheric Boundary Layer Dynamics of Transitional Flows over Complex Terrain

The influence of shear layer thickness on the stability of confined two-dimensional wakes

Boundary mixing in lakes: 2. Combined effects of shear- and convectively induced turbulence on basin-scale mixing

A Simple Model for the Afternoon and Early-Evening Decay of Turbulence over Different Land Surfaces

A Simple Model for the Afternoon and Early-Evening Decay of Turbulence over Different Land Surfaces

Atmospheric Boundary-Layer Dynamics with Constant Bowen Ratio

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Near-field flow structure of a confined wall jet on flat and concave rough walls

A Simple Model for the Afternoon and Early-Evening Decay of Turbulence over Different Land Surfaces

Atmospheric Boundary-Layer Dynamics with Constant Bowen Ratio

A Simple Model for the Afternoon and Early-Evening Decay of Turbulence over Different Land Surfaces

Stability of a Double-Diffusive Interface in the Diffusive Convection Regime

An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow

Atmospheric Boundary Layer Dynamics of Transitional Flows over Complex Terrain

Near-field flow structure of a confined wall jet on flat and concave rough walls

Boundary mixing in lakes: 2. Combined effects of shear- and convectively induced turbulence on basin-scale mixing

The influence of shear layer thickness on the stability of confined two-dimensional wakes

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