MoorDyn V2: New Capabilities in Mooring System Components and Load Cases: Paper No. OMAE2020-19341

Research output: Contribution to conferencePaper

10 Scopus Citations

Abstract

MoorDyn, an open-source mooring dynamics model, is being expanded with capabilities for additional mooring system features and load cases. As floating wind turbine technology matures, mooring systems are becoming more sophisticated and more complex scenarios need to be considered in the design process. Mooring systems may have synthetic line materials, ballast/buoyancy bodies along the lines, or interconnections between platforms. Failure modes may involve multiple cascading line failures that depend on mooring system dynamics. Features recently added to MoorDyn aim to address these emerging needs. MoorDyn’s linear elasticity model has been supplemented to support user-defined stress-strain curves, which can be adjusted to represent synthetic mooring materials. Rigid six-degree-of-freedom bodies in the mooring system can now be modeled using two new model objects. “Rod” objects provide an option for rigid cylindrical bodies. They use the existing Morison equation-based hydrodynamics model and can be connected to mooring lines at either end. “Body” objects provide a generic six-degree-of-freedom rigid-body representation based on a lumped-parameter model of translational and rotational properties. Rod objects can be added to Body objects and mooring lines can be attached at any location, allowing a wide variety of submerged structures to be integrated into the mooring system. Lastly, a means of dynamically simulating mooring line failures has been implemented. These new features, currently in the C++ version of MoorDyn, are described and then demonstrated on a two-turbine shared-mooring array. A qualitative view of the results suggests the new features are functioning as expected.
Original languageAmerican English
Number of pages8
DOIs
StatePublished - 2020
EventASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering -
Duration: 3 Aug 20207 Aug 2020

Conference

ConferenceASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering
Period3/08/207/08/20

Bibliographical note

See NREL/CP-5000-76555 for preprint

NREL Publication Number

  • NREL/CP-5000-79138

Keywords

  • MoorDyn
  • mooring dynamics
  • mooring failure
  • shared moorings

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