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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
Arièle Défossez EDF R&D, France
Co-authors:
Arièle Défossez (1) F Eric Dupont (1) Raphael Bresson (1) Guillaume Boutonnet (2)
(1) EDF R&D, CHATOU, France (2) EDF Energies Nouvelles, LA DEFENSE, France

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

Arièle Défossez is a research engineer at EDF R&D in France. She started her career at GDF in 1992. She previously worked on Research and engineering nuclear projects, she is currently working in renewable energy. She did different jobs as Laser Doppler Velocimetry technician or information technology manager. She performs advanced studies in CFD (Computational Fluid dynamics) for the benefit of EDF group. She graduated from MINES ParisTech in Energy and Environment in 2011. Occasionally, she delivers lectures to the students of MINES ParisTech.


Poster

Poster Download poster (8.28 MB)

Abstract

CFD modeling of wind flows in complex terrain taking into account the atmospheric stability

Introduction

Computational fluid dynamics (CFD) models are more and more frequently used for wind resource assessment, especially in complex terrain. One of the problems is still to take into account properly the thermal stability.

Approach

CFD simulations have been compared with in-situ measurements on a complex site, with and without taking into account stability. A detailed analysis is provided on a stable situation.

Main body of abstract

A campaign organized by EDF-R&D and EDF-Energies Nouvelles took place in the south of France and lasted about one year. Three masts (one 80 m height and two 50 m height) were equipped with cup anemometers and vanes. The 80 m mast was also equipped with 4 sonic anemometers and 4 temperature sensors. One sodar provided measurements up to about 600 m. The open source CFD model Code_Saturne was used to solve numerically the 3D Reynolds Averaged Navier Stokes equations (RANS) using the turbulence model “standard k-ε”. The used mesh had 3.3 million cells. A mesoscale model prediction of wind regime provided the boundary conditions to the CFD model. The thermal stability is accounted for using potential temperature. The method used to impose the initial and boundary conditions for this variable, which is a difficult issue in complex terrain, will be discussed.

Conclusion

The first results show an improvement in the numerical simulation if the thermal stratification is taken into account.


Learning objectives
The atmospheric stability should be taken into account to evaluate accurately wind resource assessment. However, it can be difficult to define an appropriate methodology to impose the initial and boundary conditions for the thermal variable in complex terrain.