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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'Optimising measurement strategies to maximise project value: Is the industry making false economies at the expense of project value?' taking place on Tuesday, 11 March 2014 at 11:15-12:45. The meet-the-authors will take place in the poster area.

Javier Sanz Rodrigo CENER, Spain
Co-authors:

(1) CENER, Sarriguren, Spain (2) DTU Wind Energy, Roskilde, Denmark (3) NKUA, Athens, Greece (4) VKI, Sint-Genesius-Rode, Belgium

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Dr. Javier Sanz Rodrigo has more than 10 years experience in the wind engineering field. He has a PhD from the Université Libre de Bruxelles on Engineering Science. He started his professional career as Wind Resource Analyst working for three years in Gamesa. Then he moved to research, working as Research Engineer at the von Karman Institute for four years, after which he joined CENER, where he works now as Senior Researcher. He is the coordinator of the WAUDIT Marie Curie Initial Training Network and the IEA Task 31 WAKEBENCH both related to wind resource assessment technology.

Abstract

Hierarchy of flow models and experimental support for wind resource assessment. the Waudit-Alaiz complex terrain test case

Introduction

The WAUDIT questionnaire on the state-of-the-art of wind resource assessment (2011) resulted in a wide range of methodologies based on a variety of flow models whose perceived uncertainties depend on the end-user's background and experience. While CFD and mesoscale models are increasing popularity, there is still reluctance to switch to these advanced models since they do not always show the necessary consistency and robustness that the wind industry requires.

Approach

To explore the potential of these models and their complementarities, the WAUDIT project has gathered a group of researchers to work on a common test case and exchange experiences about the use of different experimental and numerical approaches. CENER's Alaiz test site on complex terrain has been the object of study given the good characteristics of the site in terms of terrain-flow complexity and site dimensions, suitable for flow modeling from mesoscale to microscale, and high quality data on the test site supported by a well distributed network of synoptic stations operated at regional level.

Main body of abstract

From the experimental point of view the focus has been placed on the characterization of atmospheric stability from mast measurements and how it can be considered by the different modeling approaches. The use of monostatic LIDAR systems in complex terrain has been also investigated, considering flow correction algorithms to reduce systematic bias of the mean wind speed. Using wind tunnels at large scaling factors with particle image velocimetry measurements has shown good potential to complement field experiments in model validation. On the numerical side, a hierarchy of models have been compared. Physical downscaling based on RAMS and a combination of Skiron and WRF down to resolutions of ~0.5 km allowed to reduce the mean absolute error on the mean wind speed from 18% to 6%. Further physical-statistical downscaling based on WAsP microscale flow corrections allowed to efficiently account for the subgrid topographic speed-up effects relevant for site assessment. Finally, microscale modeling with CFD based on Ellipsys-ABL and CFDWind (OpenFoam) models were used to study respectively the stratified atmospheric boundary layer (ABL) and the effects of forestry on complex terrain.

Conclusion

This work summarizes the results of the "Alaiz secondment", a collaborative activity carried out by exchanging researchers from various European institutions from the WAUDIT Marie Curie network. A review of state-of-the-art experimental and model-chain approaches is presented to discuss their integration in the wind resource assessment process and to highlight their complementarities.


Learning objectives
The interested attendee will learn about current state-of-art in wind resource assessment technology with focus on the model-chain hierarchy. The Alaiz test case is studied to provide an indication of the expected level of performance of these tools in complex terrain sites.