Marine atmospheric boundary layer response to dynamic wave model in Large Eddy Simulation

The development of accurate and computationally efficient approaches for representing the interactions of wind and ocean waves is critical to the simulation of offshore wind farms to predict power production given real environmental conditions. In this work, neutral atmospheric boundary layers are generated using Large Eddy Simulation with a Dynamic Wave Spectrum Drag Model (Dyn-WaSp) that represents a full spectrum of waves via a drag force, the magnitude of which is solved for at each location given the phase of each constituent wave mode and the local wind speed. The Dyn-WaSp model is a wall model that separately accounts for resolved wind-waves, swell modes, and subfilter waves; it is horizontally resolved and vertically unresolved, which preserves phase dynamics without incurring significant computational cost. First- and second-order characteristics of neutral marine atmospheric boundary layers generated with the inclusion of different combinations of wave modes are examined and compared to other data such as those collected in field campaigns or generated by static roughness wave models to understand how the relative magnitude of resolved wind-waves, swell modes, and subfilter waves influence predictions.