7/28/2019 Integration Atmospheric Stability CFD Modeling MeteodynWT for Wind Resource Assessment AEP Validation Real C

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ReferencesReferences

ConclusionsConclusions

ObjectivesObjectives

INTEGRATION OF ATMOSPHERIC STABILITY

IN WIND POWER ASSESSMENT THROUGH CFD MODELINGCline BEZAULT (1) Guillaume DUPONT (1) Nicolas GIRARD (2) Ol ivier TEXIER (2)

(1) METEODYN (2) MAIA EOLIS GDF

PO.125PO.125

Recentstudies have shown thatatmospheric stability plays a relevantrole inwindresource assessmentresults.

According to the measurement data provided to the wind assessment team, several methods like the use of Richardson number can be used to determine the localatmospheric stability. Moreover, orographical and roughness effects arethe two main factors inducing perturbations on the wind flow. Hence, it is importantto integrate thesemethods into a software solution thatpredicts the wind flow withaccuracy.

This integration has been implemented in the CFD code Meteodyn WT which solves the Reynolds averaged Navier Stokes equations. The results show that themethodologies enable tocorrectly fitthe measurements profile even in forestedareas.

An operating wind farm located in the North East of France is studied and 16 months of data have been collected. The importance of stability effects is evaluated inomparison to the real production on site and the one computed with CFD taking into account real stability and computations with neutral atmosphere only. Including

atmospheric parameters allows us toreducethe error onmeanproduction from11%to1%.

Abs trac tAbs trac t

ResultsResults

MethodsMethods

] Turner, Journal of Applied Meteorology 1992, Vol 31, p83-91] Businger et al., 1971, flux profile relationships in the atmospheric boundary layer,J .Atmos.Sci 28 , 181 -189] H. Madsen.A Protocol for Standardizing the Performance Evaluation of Short-Term Wind Power Prediction Models.Technical University of Danemark, ANEMOS project, 2004] Meteodyn WT technical documentation

Wind flowcomputed by

CFD

Topography

Roughness

Atmosphericstability

AEP

Atmospheric stability is important for:

onsite wheretheaverage wind speed is low (