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Dr. Riccardo Mereu

Department of Energy – Politecnico di Milano, Italy 

Talk Title
Computational Fluid Dynamics approach for wind energy applications

Talk Abstract

The wind energy source is playing a leading role in the worldwide power generation, with a high yearly growth of installed wind power capacity and a continuous technological development to reduce the cost of energy and to promote a higher penetration of wind energy. In this scenario, a better comprehension of the fluid dynamics becomes necessary to increase the wind turbines efficiency and realated energy output in both small and large size devices. For this purpose, the use of experimental campaigns in wind tunnel are still largely used, requiring important investment and limiting the tested operating conditions. In last years, the Computational Fluid Dynamics (CFD) approach is used more and more for both design and optimization to investigate the single blade geometrical configuration up to whole wind farm, for single wind turbines positioning and interaction. Specifically, the CFD approach can be used with advantages and limits to support the design of flow control devices, such as the vortex generators (VGs), to define the local fluid dynamics and to carry out a detailed analysis of VGs geometrical effects up to the modeling of wind farm through the use of Actuator Line Method (ALM) approach to limit the computational costs. Both analysis can be coupled with traditional methods such as BEM (Blade Element Momentum) theory to evaluate the effects on the turbine Annual Energy Output (AEP) and related economical consequences. An example of  CFD modeling approach  used for retrofitting evaluation is reported showing the assessment of a validated procedure over a DU97W300 airfoil, equipped with VGs, at high Reynolds numbers. A comparison between new and deteriorated blades without and with VGs installation is shown and a sensitivity analysis on the influence of the vane dimensions is also reported. The analysis shows how VGs can mitigate the negative impact of surface roughness, leading to an increased AEP. Assuming a standard size wind farm, an increase of the AEP up to 3% is determined with a return of investment for the VGs installation lower than 2 years. A further example of  CFD application is based on a numerical model ALM applied to a wind farm benchmark in order to provide a sensitivity analysis over main parameters of the mode and to evaluate the effects of number of turbines, turbine distance and alignment, incident wind angle in the flow field behavior and performance of wind farm. The proposed approach shows the applicability of  such methodology to evaluate the wind farm configuration and effect of turbines interaction maintaing a computational cost reliable for applicative purposes.

Short Biography
Dr. Riccardo Mereu serves as Assistant Professor at Department of Energy of Politecnico di Milano (POLIMI). He obtained his Ph.D. in Energy Science at POLIMI and his Mechanical Engineering MSc degree at University of Cagliari, Italy. His main interest is on sustainable energy development with specific focus on numerical modelling of fluid dynamics and heat transfer phenomena in single and multiphase flows in the energy field and renewable energy systems design and modeling. He was visiting researcher at Tokyo Institute of Technology in 2009 and 2014 and Post-Doc Fellow at Massachusetts Institute of Technology from 2010 to 2012. He is actually ASME member and Associate Editor of Journal of Fluids Enegineering – ASME  and reviewer for a wide range of energy scientific journals. With more than 50 contributions in scientific journals and conferences and book chapters, he is involved in different research and capacity building national and international projects involving universities and energy companies. He is actually Vice-President of Engineering Without Borders – Milan (ISF-MI).
Talk Keywords
Wind Energy, Computational Fluid Dynamics, BEM, Actuator Lines, Vortex Generators.
Target Audience
Students, Post doctoral, Industry, Doctors and professors
Speaker-intro video

The International Conference on Innovative Applied Energy (IAPE’18)