  Wind-wave interaction involves wind forcing on wave surface and wave effects
on the turbulent wind structures, which essentially influences the wind and
wave loading on structures. Existing research on wind-wave interaction modeling
ignores the inherent strong turbulences of wind. The present study aims to
characterize the turbulent airflow over wave surfaces and wave dynamics under
wind driving force. A high-fidelity two-phase model is developed to simulate
highly turbulent wind-wave fields. Instead of using uniform wind, inherent wind
turbulences are prescribed at the inlet boundary using the turbulent spot
method. The developed model is validated by comparing the simulated wind-wave
flow characteristics with experimental data. With the validated model, a
numerical case study is conducted on a 10^2 m scale under extreme wind and wave
conditions. The result shows that when inherent wind turbulences are
considered, the resultant turbulence is strengthened and is the summation of
the inherent turbulence and the wave-induced turbulence. In addition, the wave
coherent velocities and shelter effect are enhanced because of the presence of
wind inherent turbulence. The regions of intense turbulence depend on the
relative speed between wind velocity and wave phase speed. Higher wind
velocities induce greater turbulence intensities, which can be increased by up
to 17%. The different relative speed between wind and wave can induce opposite
positive-negative patterns of wave coherent velocities. The wave-coherent
velocity is approximately proportional to the wind velocity, and the influenced
region mainly depends on the wave heights.
