Publication

Atmospheric Stability Effects on Wind Farm Flow and Power Performance

2025

Résumé

Wind farms interact with the atmospheric boundary layer (ABL) and are influenced by various atmospheric conditions such as wind direction, speed, surface-layer stability, free-atmosphere stratification, turbulence intensity, and surface properties. Previous studies often focus on individual factors or limited stability conditions. Addressing these effects during wind farm design and operation helps improve wake control strategies, optimize layouts, and yield more accurate power estimates and load calculations. This study uses large-eddy simulations (LES) of a finite-size wind farm to investigate the combined effects of surface-layer and free-atmosphere stratification on flow dynamics and power performance. Surface-layer stability is varied from strongly stable to strongly unstable, with two levels of free-atmosphere stratification: weak (1 K/km) and strong (10 K/km). The findings highlight the critical role of stability in modulating wind farm wake characteristics, turbulence intensity (TI), and boundary layer height (BLH), impacting wind farm efficiency and downstream wake interactions.

Source officielle

https://infoscience.epfl.ch/entities/publication/daec7157-e0e6-433d-ab87-6f08a420711a

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2025

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/daec7157-e0e6-433d-ab87-6f08a420711a

À propos de ce résultat

Concepts associés (32)

Planetary boundary layer

In meteorology, the planetary boundary layer (PBL), also known as the atmospheric boundary layer (ABL) or peplosphere, is the lowest part of the atmosphere and its behaviour is directly influenced by its contact with a planetary surface. On Earth it usually responds to changes in surface radiative forcing in an hour or less. In this layer physical quantities such as flow velocity, temperature, and moisture display rapid fluctuations (turbulence) and vertical mixing is strong.

Atmospheric instability

Atmospheric instability is a condition where the Earth's atmosphere is considered to be unstable and as a result local weather is highly variable through distance and time. Atmospheric stability is a measure of the atmosphere's tendency to discourage vertical motion, and vertical motion is directly correlated to different types of weather systems and their severity. In unstable conditions, a lifted thing, such as a parcel of air will be warmer than the surrounding air. Because it is warmer, it is less dense and is prone to further ascent.

Atmospheric model

In atmospheric science, an atmospheric model is a mathematical model constructed around the full set of primitive, dynamical equations which govern atmospheric motions. It can supplement these equations with parameterizations for turbulent diffusion, radiation, moist processes (clouds and precipitation), heat exchange, soil, vegetation, surface water, the kinematic effects of terrain, and convection. Most atmospheric models are numerical, i.e. they discretize equations of motion.

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Publications associées (27)

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Atmospheric Stability Effects on Wind Farm Flow and Power Performance

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