Hydrodynamic and vertical motion analysis of an underwater glider

This paper presents a towing tank-based experiment study on hydrodynamic coefficients on the underwater glider — Seagull. The present measurements were carried out at typical speeds of glider (0.2–0.5m/s) with varying angle of attack and slide. The measurements were used to study variation of drag, lift and pitching moment coefficients and angle of attack. The measurements have also been used to validate results obtained from CFD software. In addition, the Hess-Smith method was applied for added mass calculation. These results provide a better basis of designing guidance and control system of the Seagull glider.