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FLOW Webinar Recap: Nonsteady Load Responses to Atmospheric & Mountain Turbulence Eddies Relevant to Main Bearing Function

In an insightful webinar that unfolded on December 2023, the FLOW project delved into the forefront of wind energy innovations, captivating participants with a wealth of knowledge and ground breaking insights.



Unveiling the future of wind energy:


The webinar began with an illustrating keynote address by James Brasseur from University of Colorado Boulder, a well-known expert in the field, who set the tone by revealing the most recent advancements shaping the future of wind energy. Participants gained valuable insights into wind energy's transformative potential in combating climate change and driving sustainable development, including emerging technologies and innovative research methodologies. 🌬️💡


Key Insights:


🌀Three Characteristic Time Scales: Previous studies have identified three distinct time scales in the aerodynamic response of wind turbine rotors to turbulence eddies in the daytime atmospheric boundary layer (ABL). These include minute time scales associated with turbulence advection, blade rotation time scales, and sub-second time scales created by rotor blade rotation through internal ABL eddies.


🔄Contrasting Responses: Analysis of field data from the NREL/GE 1.5 MW wind turbine contrasts responses to mountain-generated eddies with ABL eddies. The study highlights potential failure mechanisms related to main bearing function and demonstrates that turbulence-generated time variations in out-of-plane bending moment are of similar order to torque variations, yet uncorrelated, indicating different forcing mechanisms.


🔍Validation and Confirmation: Field studies validate key computational results and show stronger responses in non-torque bending moments compared to computer simulations. Regardless of wind direction, torque and non-torque bending moments are uncorrelated, emphasizing different mechanisms driving power generation and main bearing function associated with turbulence eddies through the wind turbine rotor disk.


👥About Dr. James Brasseur:

Is a distinguished Research Professor of Aerospace Engineering Sciences at the University of Colorado Boulder, bringing over four decades of expertise in fluid dynamics and mechanical engineering. Formerly a Professor at the Pennsylvania State University for 27 years, Dr. Brasseur's research spans turbulence physics, atmospheric flows, and large-eddy simulation, as well as the mechanics and physiology of the gastrointestinal tract. With a Ph.D. from Stanford University, he has held postdoctoral positions at NASA-Ames, University of Southampton, and Johns Hopkins University. Dr. Brasseur's contributions extend beyond academia, having served on governing boards of the American Physical Society and as a past president of a medical society. He is recognized as a Fellow of the American Physical Society and has authored over 400 publications, including significant contributions to wind turbine aerodynamics and experimental aerodynamics.

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