Experimental study and passive control of the bistable dynamics of the three-dimensional air-wake flow of a finite-width double backward-facing step

Inspired by the study of Rao et al. (2019), aerodynamics a simplified frigate is investigated experimentally. The natural wake flow dynamics shown to be bi-stable at zero yaw angles, both rear ship superstructure and stern. strongly weakened stern when lifted off ground in free-stream. Perimetric cavities sufficient depth are able suppress symmetrize air-wake base pressure increases with cavity while drag force slightly decreases. Our experimentally confirms that perimetric offer efficient devices for passive control strategies aerodynamic bodies complex geometries subject dynamics.