This paper uses Computational Fluid Dynamics (CFD) simulations of the generic BB2 submarine geometry to investigate the effect of sailplane deflection on the nominal wake at the propeller plane. Studies of marine vehicle wakes typically consider the vessel heading straight-ahead with no deflection of the control surfaces. While this is the most-typical condition, vessels can operate for significant periods with control surfaces deflected. The wake of the control surfaces can flow downstream and alter the nominal wake seen by the propeller. When the BB2 generic submarine geometry is simulated running straight-ahead, the wake of the sailplanes does not influence the nominal wake. However, deflection of the sailplanes can indirectly alter the nominal wake. The sailplane deflection modifies the pressure field in the vicinity of the sail, which alters the formation and downstream path of the sail-junction flow. The modification of the sail-junction flow then alters the nominal wake. Deflecting the sailplanes leading edge upwards, spreads the sail-junction flow away from the hull centreline, while an opposite deflection pulls the sail-junction flow towards the hull centreline.
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