Methods for determining wind conditions in complex terrain

The main purpose of the project has been to investigate micro-scale wind conditions in complex terrain using ''remote-sensing'' techniques and CFD computations and validate these using measurements. The work done in the project can be divided into three main parts: I. ''The Bolund Experiment'' is a measuring campaign performed in 2007 and 2008 on a small but complex hill located near Risø DTU. High frequency data from 35 anemometers provides a unique database that provides wind data for validating micro-scale models. 2. ''The Bolund Blind Comparison'' is an intercomparison of micro-scale models where model users and developers were challenged to predict the wind over the Bolund hill. The modelers did not have any prior knowledge about the measurement results or the other modelers predictions, i.e. the predictions where made blindly. More than 50 numerical and wind tunnel results were submitted and the blind comparison is thereby a unique opportunity to assess the accuracy of present day flow models. 3. ''The Benakanahalli Experiment'' is a measuring campaign that was conducted in a 3 month period from February to April 2010 on a 120m high hill located in southern part of India. The goal of the Benakanahalli experiment was to have a data set that includes much of the physics (Coriolis effects, thermal stratification) that can be neglected for Bolund and resembles a real complex wind turbine site