A series of controlled flume experiments were conducted to investigate the influence of bathymetry-induced shear flow on the turbulent wake dynamics of a scaled three-bladed horizontal-axis tidal turbine. The velocity field and turbulence structure downstream of the rotor were measured using a three-dimensional Acoustic Doppler Velocimeter (ADV), enabling detailed characterization of transient turbulence intensity and Reynolds stress distributions. Turbulence intensity was used to assess spatial wake development, while turbulence anisotropy was quantified via the Lumley triangle framework. The results show that seabed-generated shear significantly modifies wake development, producing elevated turbulence near the lower blade tip and altered mixing patterns relative to uniform inflow. Lumley-triangle analysis reveals pronounced rod-like and, in some cases, quasi-one-component turbulence states—features not previously reported for bathymetry-affected turbine wakes. These anisotropic structures persist farther downstream in the lower wake and intensify as the rotor approaches the seabed. These findings highlight the critical role of environmental shear in shaping wake turbulence structure and underscore the importance of incorporating anisotropic turbulence modeling in predictive flow simulations.
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