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Large-Eddy Simulations (LES) of an array of wind turbines have been carried out to design and evaluate a model-free approach, extremum-seeking control (ESC), for power maximization. This paper shows how to coordinate the action of the extremum seeking controllers (at each turbine) by nesting the objective functions used for optimization so that the power of the overall array is maximized. The paper...
Large Eddy Simulations of the flow past an array of three aligned turbines have been performed using two different control strategies: constant torque gain and the Extremum Seeking Control. An off-design tip speed ratio has been chosen as initial condition for each turbine. It is shown that the turbines controlled with constant torque gain do not reach their optimum tip speed ratio. On the other hand,...
In this paper we describe an effort recently completed at UT Dallas to develop a high-fidelity computational fluid dynamics code to test and develop control algorithms aimed at maximizing power production and load mitigation. Preliminary results of three aligned turbines operating at different tip speed ratios (TSRs) are discussed to show the wealth of details available from the present code. The...
This special issue presents recent results on Web and social graph mining, both at the methodological level and on the application side. The goal is to allow researchers to share their experience in this new and multifaceted field, and to help industry in its efforts to provide users with new social networking applications. The articles presented here focus on methods and algorithms for mining, as...
After five years of continued development, the Caribbean Coastal Ocean Observing System (CariCOOS) has reached a major turning point regarding the nature of its ocean observing platforms and numerical modeling efforts. During the design stage of CariCOOS, stakeholder consultations highlighted the need for operational instrumented buoy platforms to provide data on winds, waves, currents and water quality...
Wikipedia is an online encyclopedia, available in more than 100 languages and comprising over 1 million articles in its English version. If we consider each Wikipedia article as a node and each hyperlink between articles as an arc we have a "Wikigraph", a graph that represents the link structure of Wikipedia. The Wikigraph differs from other Web graphs studied in the literature by the fact...
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