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White paper - Atmospheric boundary layer modellisation

From the general characteristics of the atmospheric boundary layer to the impact of thermal effects and stability on turbulence, passing through the Monin-Obukhov's similarity theory, this white paper covers all the knowledge needed for the atmospheric boundary layer modeling. It details the numerical models available for its computation, focusing on the RANS model (k-ε, k-ω, k-L), more suitable for industrial use or for complex site configurations.
Modelling wind flow in forested area: a parametric study

This paper presents an analysis of CFD modelling, using a k-L turbulence model designed for forested areas. Meteodyn and Iberdrola Renovables have undertaken a systematic analysis of measurements data obtained in numerous sites, compared with Computation Fluid Dynamic approach. The analysis has consisted in highlighting the influence of several parameters on the shear defined as the vertical gradient of wind speed and the turbulence intensity at the wind turbine hub height. The influence is...
CFD MODELING OF FOREST CANOPY FLOWS: INPUT PARAMETERS, CALIBRATION AND VALIDATION

Wind flow simulations on forested zone have been performed with Computational Fluid Dynamics (CFD) software Meteodyn WT, which allows introducing a custom forest canopy model. The influence of parameter changes on results is investigated. The calibration of model parameters is done by minimizing the error between the CFD results and the vertical wind profiles given by the European standard Eurocode 1 (EC1), applied to...
A new Turbulence Model for the Stable Boundary Layer with Application to CFD in Wind Resource Assessment

In wind resource assessment, the impact of the atmospheric thermal stability attracts more and more attention. The first reason is the increase of wind turbines height. The second reason is that the practice of WRA engineering is evolving towards a regular use of time series extrapolations (measurements or mesoscale data) or at least more detailed statistical analysis. Using time series instead of global statistics leads...
Investigation and validation of wake model combinations for large wind farm modelling in neutral boundary layers

An original approach consisting on the combination of two wake patterns – a single wake model with a neutral boundary layer modification - is investigated in order to model large wind farm wake effect. Sensitivity studies of boundary layer parameters are carried out to optimise the velocity and power corrections whatever the type of wind farms and the wind direc...
Atmospheric stability: general classification and simulation in Meteodyn WT

With regard to increasing turbine hub heights thermal stability is becoming more and more popular in wind power assessment. For this, knowledge about atmospheric stability is necessary and a need for proper modeling of the wind conditions in the upper boundary layer arises. This paper proposes some solutions by introducing reanalysis data and a new approach for the modeling of stability effects in CFD codes.