In June, Brian Owens (in Sandia’s Analytical Structural Dynamics Dept.) and Todd Griffith (in Sandia’s Water Power Technologies Dept.) traveled to DTU Lyngby (Technical University of Denmark: Copenhagen, Denmark) to present Sandia research on deep-water multiple-megawatt vertical-axis wind turbines (VAWTs).
High tip-speed ratios, low frequency structural vibration modes, and flexible blades of multiple-megawatt VAWTs can give rise to aeroelastic stability concerns. Owens and Griffith presented on a design study of aeroelastic stability of very large VAWTs that used an enhanced version of the Offshore Wind Energy Simulation Toolkit for VAWTs.
While abroad, Griffith and Owens also attended a two-day VAWT workshop hosted by DTU Risø. The workshop provided an opportunity to discuss current VAWT research and development status. Topics at the workshop included VAWT modeling, testing, and economics as well as VAWT design concepts and certification.
Retired Sandian Dale Berg also presented a historical perspective from the legacy Sandia VAWT research from 1973–95.