Incorporation of Multi-Member Substructure Capabilities in FAST for Analysis of Offshore Wind Turbines: Preprint

Research output: Contribution to conferencePaper


FAST, developed by the National Renewable Energy Laboratory (NREL), is an aero-hydro-servo-elastic tool widely used for analyzing onshore and offshore wind turbines. This paper discusses recent modifications made to FAST to enable the examination of offshore wind turbines with fixed-bottom, multi-member support structures (which are commonly used in transitional-depth waters). ; This paperaddresses the methods used for incorporating the hydrostatic and hydrodynamic loading on multi-member structures in FAST through its hydronamic loading module, HydroDyn. Modeling of the hydrodynamic loads was accomplished through the incorporation of Morison and buoyancy loads on the support structures. Issues addressed include how to model loads at the joints of intersecting members and ontapered and tilted members of the support structure. Three example structures are modeled to test and verify the solutions generated by the modifications to HydroDyn, including a monopile, tripod, and jacket structure. Verification is achieved through comparison of the results to a computational fluid dynamics (CFD)-derived solution using the commercial software tool STAR-CCM+.
Original languageAmerican English
Number of pages13
StatePublished - 2012
EventOffshore Technology Conference - Houston, Texas
Duration: 30 Apr 20123 May 2012


ConferenceOffshore Technology Conference
CityHouston, Texas

NREL Publication Number

  • NREL/CP-5000-53676


  • fast
  • HydroDyn
  • hydrodynamic load
  • multi-member structure
  • offshore foundation


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