Concept

Atmospheric instability

Related publications (123)

Wake flow in a wind farm during a diurnal cycle

Fernando Porté Agel, Mahdi Abkar, Ahmad Sharifi

The atmospheric boundary layer (ABL) undergoes substantial changes in its structure and dynamics in the course of a day due to the transient nature of forcing factors such as the surface fluxes of heat and momentum. The non-stationary nature of the mean wi ...

Taylor & Francis2016

Critical inclination for absolute/convective instability transition in inverted falling films

Nicolas Igor Jacques Kofman

Liquid films flowing down the underside of inclined plates are subject to the interaction between the hydrodynamic and the Rayleigh-Taylor (R-T) instabilities causing a patterned and wavy topology at the free surface. The R-T instability results from the d ...

Amer Inst Physics2016

Effect of Large Finite-Size Wind Farms and Their Wakes on Atmospheric Boundary Layer Dynamics

Fernando Porté Agel, Ka Ling Wu

Through the use of large-eddy simulation, the effect of large finite-size wind farms and their wakes on conventionally-neutral atmospheric boundary layer (ABL) dynamics and power extraction is investigated. Specifi- cally, this study focuses on a wind farm ...

2016

Large-Eddy Simulation of the Wake Flow Inside and Downwind of a Large Finite-Size Wind Farm

Fernando Porté Agel, Ka Ling Wu

As the number of operating offshore large wind farms continues to increase, it is important to investigate the wake flows of these large wind farms since they could significantly affect the atmospheric boundary layer (ABL) dynamics and the performance of a ...

2016

Development of a new 1D urban canopy model: coherences between surface parameterizations

Dasaraden Mauree, Alain Clappier

A 1-D Canopy Interface Model (CIM) was developed in order to better simulate the effect of urban obstacles on the atmosphere in the boundary layer. The model solves the Navier-Stokes equations on a high-resolved gridded vertical column. The effect of the s ...

2015

Influence of atmospheric stability on wind-turbine wakes: A large-eddy simulation study

Fernando Porté Agel, Mahdi Abkar

In this study, large-eddy simulation is combined with a turbine model to investigate the influence of atmospheric thermal stability on wind-turbine wakes. The simulation results show that atmospheric stability has a significant effect on the spatial distri ...

American Institute of Physics2015

On the Impact of Wind Farms on a Convective Atmospheric Boundary Layer

Fernando Porté Agel, Hao Lu

With the rapid growth in the number of wind turbines installed worldwide, a demand exists for a clear understanding of how wind farms modify land-atmosphere exchanges. Here, we conduct three-dimensional large-eddy simulations to investigate the impact of w ...

Springer2015

Minimal model for double diffusion and its application to Kivu, Nyos, and Powell Lake

Alfred Johny Wüest, Marco Toffolon

Double diffusion originates from the markedly different molecular diffusion rates of heat and salt in water, producing staircase structures under favorable conditions. The phenomenon essentially consists of two processes: molecular diffusion across sharp i ...

American Geophysical Union2015

Instability of two-phase co-axial jets at small Reynolds number

Laura Augello

A precise knowledge of co-axial flow dynamics and a better understanding of the mechanisms that act to destabilize the interface between the two fluids is of fundamental interest in many industrial applications like lubricated transport, injection devices, ...

EPFL2015

Evolution of brown carbon in wildfire plumes

Athanasios Nenes, Junqiu Liu

Particulate brown carbon (BrC) in the atmosphere absorbs light at subvisible wavelengths and has poorly constrained but potentially large climate forcing impacts. BrC from biomass burning has virtually unknown lifecycle and atmospheric stability. Here, BrC ...

Blackwell Publishing Ltd2015

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