“…While these can be significant in specific cases, (e.g., when a diffuser is placed around a rotor Tampier et al, 2017), relevant experience suggests that even large structures in proximity to a rotor can have a limited impact. Ettema (2022), e.g., evaluated a tidal fence of four rotors through towing tank experiments (using the towing tank wall as a symmetry plane) with a vertical side wall constructed with a profile-shaped cross-section. The wall was placed on one end of the fence to reduce power losses on the outboard rotor.…”