Assessment of turbulence correction for actuator-line model of a horizontal-axis tidal stream turbine in near-wake region

Near-wake characteristics of a turbine play an important role in turbine–wake interactions and performance assessment arrays. In this study, the near-wake flow behind laboratory-scale tidal stream is simulated compared with experimental data. An actuator-line model used to represent rotating blades. Further, two physics-based turbulence corrections are proposed for unsteady Reynolds-averaged Navier–Stokes (URANS) modeling turbine. These seek additional turbulent production near blade boundary layer tip shear region. The data analysis fluctuating velocity spectrum experiment highlights that kinetic energy (TKE) can be decomposed into three parts: background from onset flow, rotor-scale turbulence, blade-induced turbulence. dominates rotor plane decreases sharply beyond one diameter downstream. profiles TKE results show URANS enhance induced by rotation. It improve prediction region minor impact on loads wake velocity.