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Comparison of Hydrodynamic Load Predictions Between Reduced Order Engineering Models and Computational Fluid Dynamics for the OC4-DeepCwind Semi-Submersible

[+] Author Affiliations
Maija A. Benitz, David P. Schmidt, Matthew A. Lackner, Gordon M. Stewart

University of Massachusetts, Amherst, MA

Jason Jonkman, Amy Robertson

National Renewable Energy Laboratory, Golden, CO

Paper No. OMAE2014-23985, pp. V09BT09A006; 11 pages
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 9B: Ocean Renewable Energy
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4554-7
  • Copyright © 2014 by ASME


Hydrodynamic loads on the platforms of floating offshore wind turbines are often predicted with computer-aided engineering tools that employ Morison’s equation and/or potential-flow theory. This work compares results from one such tool, FAST, the National Renewable Energy Laboratory’s wind turbine computer-aided engineering tool, and the high-fidelity computational fluid dynamics (CFD) package, OpenFOAM, for the OC4-DeepCwind semi-submersible analyzed in the International Energy Agency Wind Task 30 project. Load predictions from HydroDyn, the offshore hydrodynamics module of FAST, are compared with results from OpenFOAM. HydroDyn uses a combination of Morison’s equation and potential-flow theory to predict the hydrodynamic forces on the structure, at a small computational cost compared to CFD. The implications of the assumptions in HydroDyn are evaluated based on this code-to-code comparison.

Copyright © 2014 by ASME



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