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IEA-Wind Task 31 WAKEBENCH (2011-2014)

IEA-Wind Task 31 "WAKEBENCH": Benchmarking of Wind Farm Flow Models. The main objective of this IEA Task is to provide a forum for industrial, governmental and academic partners to develop, evaluate and improve atmospheric boundary layer and wind turbine wake models for use in wind energy.

The Annex aims at defining quality-checked procedures for the simulation of wind and wakes. The working methodology is based on the benchmarking different wind and wake modeling techniques in order to identify and quantify best practices for using these models under a wide range of conditions: from onshore to offshore, from flat to complex terrain and from single wind turbines to large wind farms. These benchmarks involve model intercomparison versus experimental data.

The outcome of this first phase of Wakebench is a Model Evaluation Protocol (MEP) to addresses a verification and validation (V&V) framework for wind farm flow models at microscale level, typically used in wind resource/site assessment and wind farm design applications. The validation process follows a building-block approach whereby the complex system of a wind farm is subdivided into subsystems and unit problems to form a hierarchy of model-intercomparison benchmarks with a systematic increase of complexity. This allows isolating individual or combined elements of the model-chain to evaluate the potential impact at full system performance. This protocol is implemented operationaly in the windbench benchmarking portal.

Wakebench Model Evaluation Protocol

A technical annex of the MEP is also developed to provide more detailed information on relevant elements of the model evaluation process in terms of "best practice guidelines" for wind flow modelers.

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