We develop a numerical method for simulating coupled interactions of complex floating structures with large-scale ocean waves and atmospheric turbulence. We employ an efficient large-scale model to develop offshore wind and wave environmental conditions, which are then incorporated into a high resolution two-phase flow solver with fluid–structure interaction (FSI). The large-scale wind–wave interaction model is based on a two-fluid dynamically-coupled approach that employs a high-order spectral method for simulating the water motion and a viscous solver with undulatory boundaries for the air motion. The two-phase flow FSI solver is based on the level set method and is capable of simulating the coupled dynamic interaction of arbitrarily complex bodies with airflow and waves. The large-scale wave field solver is coupled with the near-field FSI solver with a one-way coupling approach by feeding into the latter waves via a pressure-forcing method combined with the level set method. We validate the model for both simple wave trains and three-dimensional directional waves and compare the results with experimental and theoretical solutions. Finally, we demonstrate the capabilities of the new computational framework by carrying out large-eddy simulation of a floating offshore wind turbine interacting with realistic ocean wind and waves.
Bibliographical noteFunding Information:
This work has been supported by the U.S. Department of Energy ( DE-EE 0005482 ), the US National Science Foundation ( CBET-1341062 and CBET-1622314 ), the Office of Naval Research ( N00244-14-2-008 ), and the University of Minnesota Initiative for Renewable Energy and the Environment . The computational resources were provided by the Minnesota Supercomputing Institute and Sandia National Laboratories.
- Fluid–structure interaction
- Large-eddy simulation
- Level set method
- Two-phase free surface flow